{
  "schemaVersion": 1,
  "status": "public",
  "language": "en",
  "website": {
    "name": "Watt & Home",
    "url": "https://wattandhome.com/",
    "publisher": {
      "name": "Watt & Home Team",
      "url": "https://wattandhome.com/about/"
    }
  },
  "scope": "Published editorial content only. No visitor inputs, saved scenarios or personal measurement records are included.",
  "interpretation": {
    "canonicalContent": "Canonical HTML pages contain the visitor-facing explanations and original source links. This catalogue is optional supporting metadata, not a search inclusion requirement.",
    "examples": "Calculator examples use explicitly illustrative tariffs, routines and prices. Changing currency does not convert prices.",
    "models": "Product declarations are not independent measurements by Watt & Home. Preserve model, market, capacity, unit, test basis and source version.",
    "measurements": "External study averages retain their observer attribution. User-entered observations remain device-local and are not published in this catalogue.",
    "dates": "Editorial review dates, source check dates and document versions have different meanings; none implies live stock or a current retail price."
  },
  "calculators": [
    {
      "id": "fridge",
      "canonical": "https://wattandhome.com/calculators/fridge-running-cost/",
      "title": "Fridge running-cost calculator",
      "summary": "Annual fridge or freezer kWh multiplied by your electricity rate gives an annual electricity estimate. Monthly and daily amounts are averages of that year, rather than predictions for every bill or day.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Energy from a compatible source",
          "unit": "kWh/year",
          "help": "Use annual label consumption or an appropriately annualized measurement; retain model and configuration."
        },
        {
          "name": "Your electricity price",
          "unit": "GBP, USD or EUR per kWh",
          "help": "Enter major currency units; 20 cents means 0.20 in the matching currency."
        },
        {
          "name": "Source context",
          "unit": "Model, compartments and conditions",
          "help": "Capacity and a suitable cold-storage task matter when comparing models."
        }
      ],
      "formula": "Annual cost = annual kWh × price/kWh. Monthly annual average = annual cost ÷ 12; daily annual average = annual cost ÷ 365.",
      "illustrativeExample": "Illustrative arithmetic: 365 kWh/year × $0.20/kWh = $73/year, averaging about $6.08/month or $0.20/day. These figures are assumptions, not a tested model or a national tariff.",
      "interpretation": "A difference in daily averages may be small even when annual savings are meaningful. Compare total household storage, purchase outlay and source scope; do not multiply rated watts by all 24 hours without evidence of that average draw.",
      "questions": [
        {
          "question": "Can I use a one-hour fridge reading?",
          "answer": "A one-hour energy sample may omit later compressor or defrost operation. Keep it as an observation of that hour. Use representative complete-day measurements for a daily-use projection and record the conditions."
        },
        {
          "question": "Can I add another freezer to the comparison?",
          "answer": "Yes, as a separate non-overlapping appliance row in the household planner, or sum both annual quantities for a clearly described storage solution. Include both purchase costs when comparing two solutions."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-fridge-label",
          "name": "European Commission: Fridge and freezer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/fridges-and-freezers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "washer",
      "canonical": "https://wattandhome.com/calculators/washing-machine-running-cost/",
      "title": "Washing-machine running-cost calculator",
      "summary": "Price the energy basis on your washing-machine source, then apply your own completed-load frequency. Cycle energy, cycle water and detergent have different units and remain separate components of the optional variable-cost subtotal.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Stated energy",
          "unit": "kWh/year, kWh/cycle or kWh/100 cycles",
          "help": "Choose the exact basis shown on the source; eco values do not represent every programme."
        },
        {
          "name": "Completed loads",
          "unit": "cycles/week",
          "help": "Needed for cycle-based inputs; annual declarations are priced directly."
        },
        {
          "name": "Optional cycle costs",
          "unit": "Water volume, matching rate, consumable cost/cycle",
          "help": "Blank components remain excluded. A known water quantity without a price is retained but not costed."
        }
      ],
      "formula": "Cycle kWh = per-100-cycle kWh ÷ 100, or stated per-cycle kWh directly. Annual cycle energy = cycle kWh × weekly cycles × 52. Add optional variable costs per cycle separately.",
      "illustrativeExample": "Illustrative arithmetic: 52 kWh/100 cycles becomes 0.52 kWh/cycle. At $0.20/kWh, electricity is $0.104/cycle. Four loads/week across 52 weeks use 108.16 kWh and cost $21.632, displayed as $21.63/year.",
      "interpretation": "Keep label programme, load weighting and any associated external hot-water energy visible. A complete measured cycle already includes the electricity within its measurement boundary; adding a duty-cycle factor would count that adjustment twice.",
      "questions": [
        {
          "question": "Why are optional costs unavailable for an annual source?",
          "answer": "An annual declaration does not establish your own cycle count or energy per cycle. Use a compatible cycle-based source for the per-use subtotal; do not divide an annual figure by a guessed household load count."
        },
        {
          "question": "Does a half load cost exactly half as much?",
          "answer": "Not necessarily. The programme and appliance determine the relationship. Use a compatible programme declaration or record complete comparable cycles instead of scaling every input by load weight."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "eu-washing-label",
          "name": "European Commission: Washing-machine energy labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/washing-machines_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "us-washer-label",
          "name": "ENERGY STAR: Clothes-washer energy metrics",
          "url": "https://www.energystar.gov/products/clothes_washers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "dryer",
      "canonical": "https://wattandhome.com/calculators/tumble-dryer-running-cost/",
      "title": "Tumble-dryer running-cost calculator",
      "summary": "Dryer costs depend on the programme and load basis as well as the kWh number. Price a stated year directly, or convert cycle energy using your planned frequency without mixing legacy full-load cotton and weighted eco figures.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Energy and unit",
          "unit": "kWh/year, kWh/cycle or kWh/100 cycles",
          "help": "Read the applicable label or product sheet, including whether it uses weighted or full-load data."
        },
        {
          "name": "Drying frequency",
          "unit": "cycles/week",
          "help": "Use completed drying tasks, which need not equal all washing loads."
        },
        {
          "name": "Electricity rate",
          "unit": "Selected currency/kWh",
          "help": "Use the rate applying to the drying routine; currency choice does not convert it."
        }
      ],
      "formula": "Annual cycle energy = (energy ÷ 100 for a per-100-cycle input, otherwise per-cycle energy) × cycles/week × 52. Annual electricity cost = annual kWh × price/kWh.",
      "illustrativeExample": "Illustrative arithmetic: 110 kWh/100 cycles = 1.1 kWh/cycle. Four drying cycles/week give 228.8 kWh/year and $45.76 at $0.20/kWh.",
      "interpretation": "The result describes the selected source and routine. Washing spin performance, load, target dryness and programme can affect a measured comparison. Do not treat all figures labelled kWh/cycle as the same test.",
      "questions": [
        {
          "question": "Can I use the washing-machine cycle count?",
          "answer": "Only if every counted washing load receives the corresponding drying task. Use your drying frequency, and account for loads split into more than one allowed dryer batch."
        },
        {
          "question": "Does a lower running cost justify any purchase premium?",
          "answer": "No. Use the comparison tool with both prices and a chosen period. Small annual electricity savings can take longer than your chosen period to recover a large extra purchase price."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "eu-dryer-label",
          "name": "European Commission: Tumble-dryer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/tumble-dryers_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "uk-energy-labels",
          "name": "GOV.UK: Energy labelling in Great Britain and Northern Ireland",
          "url": "https://www.gov.uk/guidance/the-energy-labelling-of-products",
          "region": "UK",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "dishwasher",
      "canonical": "https://wattandhome.com/calculators/dishwasher-running-cost/",
      "title": "Dishwasher running-cost calculator",
      "summary": "Apply your own tariff to a compatible dishwasher energy figure. For cycle inputs, add optional water, wastewater and consumables as separately visible variable costs, rather than treating the electricity result as the whole cost of a wash.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Cycle or annual energy",
          "unit": "kWh on the source basis",
          "help": "Retain the programme and cold/hot-water supply boundary."
        },
        {
          "name": "Weekly completed cycles",
          "unit": "cycles/week",
          "help": "Used only to annualize cycle inputs across 52 weeks."
        },
        {
          "name": "Optional water and consumables",
          "unit": "Litres or specified gallons; cost/cycle",
          "help": "Use matching variable water billing units and actual usable-dose costs; fixed fees stay excluded."
        }
      ],
      "formula": "Electricity per cycle = compatible cycle kWh × tariff. Included variable subtotal = electricity + entered cycle water/wastewater + entered detergent + entered other consumables.",
      "illustrativeExample": "Illustrative arithmetic: 74 kWh/100 cycles = 0.74 kWh/cycle. At $0.20/kWh, that is $0.148/cycle. Four cycles/week across 52 weeks cost $30.784, displayed as $30.78/year for electricity alone.",
      "interpretation": "Eco declarations need not describe quick or intensive programmes. A volume-based water charge is separate from water-heating energy; do not add another heating estimate when the selected source already contains it.",
      "questions": [
        {
          "question": "How do I price rinse aid or salt?",
          "answer": "Use an explicit per-cycle allowance based on the amount consumed, rather than charging the whole pack to one cycle. A blank allowance stays excluded from the subtotal."
        },
        {
          "question": "Can I compare this total with handwashing?",
          "answer": "Only after defining comparable dishes and cleaning outcomes and measuring or documenting handwashing water, heat and consumables. This tool does not infer those quantities."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "eu-dishwasher-label",
          "name": "European Commission: Dishwasher labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/dishwashers_en",
          "region": "EU",
          "checkedOn": "2026-10-02"
        },
        {
          "id": "us-dishwasher-label",
          "name": "ENERGY STAR: Dishwasher energy metrics",
          "url": "https://www.energystar.gov/products/dishwashers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "comparison",
      "canonical": "https://wattandhome.com/calculators/appliance-comparison/",
      "title": "Appliance cost comparison",
      "summary": "Compare two suitable new purchase options over the same chosen period. Annualize compatible energy figures, apply one tariff and add each purchase price; the result also shows the price premium electricity savings could cover.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Energy for A and B",
          "unit": "Compatible annual or cycle kWh",
          "help": "Match capacity, programme and energy boundary before using the difference."
        },
        {
          "name": "Both purchase prices",
          "unit": "One selected currency",
          "help": "Enter comparable quote scope, including the costs you intend to compare."
        },
        {
          "name": "Common routine and horizon",
          "unit": "Cycles/week where needed; 1–30 years",
          "help": "The period is a scenario, not a forecast of either appliance’s life."
        }
      ],
      "formula": "Period total = purchase price + annual kWh × tariff × years. Positive annual savings = (A kWh − B kWh) × tariff. Electricity-funded premium = positive annual savings × years.",
      "illustrativeExample": "Illustrative arithmetic: A uses 365 kWh/year and costs $550; B uses 250 kWh/year and costs $650. At $0.20/kWh, B saves $23/year. Five-year totals are $915 for A and $900 for B; the $100 premium has about 4.35 years of simple electricity payback.",
      "interpretation": "Equal energy creates no tariff-based crossover. A cheaper but more electricity-intensive option can become more expensive at a sufficiently high tariff. Repairs, finance, water and other consumables are outside these purchase-plus-electricity totals.",
      "questions": [
        {
          "question": "What does the maximum worthwhile premium mean?",
          "answer": "It is the extra purchase price covered by electricity savings over the entered period. It does not assign a value to noise, capacity, repairs or other product features."
        },
        {
          "question": "Which tool should I use for an appliance I already own?",
          "answer": "If keeping a working appliance is an option, use replacement payback. Its upfront cost is the new replacement outlay, rather than the price difference between two new purchases."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": []
    },
    {
      "id": "replacement",
      "canonical": "https://wattandhome.com/calculators/replacement-payback/",
      "title": "Appliance replacement-payback calculator",
      "summary": "For a working appliance, compare keeping it with paying the net cost of a replacement. Positive electricity savings may recover that new outlay over time, but a payback period does not predict product life or future tariffs.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Current and replacement energy",
          "unit": "Comparable annual electrical kWh",
          "help": "Do not infer old consumption from age alone; use a suitable source."
        },
        {
          "name": "Replacement outlay",
          "unit": "Purchase + installation + disposal − confirmed credits",
          "help": "The old purchase price is already spent and is excluded."
        },
        {
          "name": "Tariff and horizon",
          "unit": "Selected currency/kWh and years",
          "help": "Keep the same comparison period and electricity assumptions for both options."
        }
      ],
      "formula": "Annual savings = (current kWh − replacement kWh) × tariff. Net upfront = purchase + installation + disposal − confirmed credits. Simple payback = positive net upfront ÷ positive annual savings.",
      "illustrativeExample": "Illustrative arithmetic: 500 versus 200 kWh/year at $0.20/kWh saves $60/year. A $500 net replacement outlay has about 8.33 years of simple payback. Across five years, keeping costs $500 in electricity and replacing costs $700 including outlay.",
      "interpretation": "A broken appliance needs another baseline because keeping it operational may no longer be an option. Confirmed credits cannot exceed entered costs. Zero outlay and zero or negative savings are separate outcomes rather than ordinary finite payback periods.",
      "questions": [
        {
          "question": "Why does a replacement with lower annual cost still lose over five years?",
          "answer": "The electricity savings may not yet cover the initial replacement outlay. Read the complete period totals, not only the cheaper running-cost figure."
        },
        {
          "question": "Are uncertain rebates or future repairs included?",
          "answer": "Only confirmed entered credits are used. Repairs, failure, future tariffs, resale, financing and environmental impacts are excluded; consider them separately in the decision."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "energy-star-replacement",
          "name": "ENERGY STAR: Flip Your Fridge calculator and assumptions",
          "url": "https://www.energystar.gov/products/refrigerators/flip-your-fridge",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-recycling",
          "name": "ENERGY STAR: Fridge and freezer recycling routes",
          "url": "https://www.energystar.gov/products/recycle/find_fridge_freezer_recycling_program",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "electricity",
      "canonical": "https://wattandhome.com/calculators/electricity-cost/",
      "title": "Electricity cost calculator: watts and hours",
      "summary": "For steady electrical input, convert watts to kW and multiply by time to obtain kWh. Alternatively use a complete-day measurement or separate operating modes; these are alternative descriptions of a boundary, not quantities to add together.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Energy basis",
          "unit": "Power/time, measured days or operating modes",
          "help": "Use electrical input rather than heat output or cooling capacity."
        },
        {
          "name": "Daily time and use days",
          "unit": "Hours or minutes/day; selected period days",
          "help": "Mode hours must not overlap and must total no more than 24/day."
        },
        {
          "name": "Tariff",
          "unit": "Selected currency/kWh",
          "help": "A variable or time-of-use tariff needs a suitable energy-weighted price or separate period calculations."
        }
      ],
      "formula": "Power basis: kWh = watts ÷ 1,000 × daily hours × use days. Measured basis: kWh = sample kWh ÷ complete sample days × use days. Modes: sum watts × separate daily hours ÷ 1,000, then multiply by use days.",
      "illustrativeExample": "Illustrative arithmetic: a constant 1,000 W for two hours on 30 use days uses 60 kWh and costs $12 at $0.20/kWh. This is a selected routine, not a standard appliance draw.",
      "interpretation": "Nameplate maximum power is not automatically average draw. Unassigned mode hours remain excluded, while captured idle and cycling use are already present in a complete measurement.",
      "questions": [
        {
          "question": "Can I enter a zero electricity price?",
          "answer": "Yes, a known zero variable tariff gives zero variable electricity cost. It does not remove any fixed charges or prove energy use is zero."
        },
        {
          "question": "How do I obtain average watts from a reading?",
          "answer": "For the same observed interval, average watts = measured kWh × 1,000 ÷ elapsed hours. Retain the conditions; a short interval need not represent a complete day."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "heater",
      "canonical": "https://wattandhome.com/calculators/electric-heater-running-cost/",
      "title": "Electric-heater running-cost calculator",
      "summary": "A heater’s full-input hourly cost is electrical kW multiplied by your tariff. Thermostat-enabled time can differ from actual input time, so measured complete-day energy can be a more representative basis for a chosen heating routine.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Selected heating input",
          "unit": "Electrical W or kW",
          "help": "Use the actual setting or a documented average, not an assumed universal duty cycle."
        },
        {
          "name": "Heating routine",
          "unit": "Time/use day and seasonal days",
          "help": "A winter routine should not silently become all-year use."
        },
        {
          "name": "Alternative measured sample",
          "unit": "kWh across complete days",
          "help": "Keep room conditions, thermostat setting and usage context with the sample."
        }
      ],
      "formula": "Full-input period kWh = electrical kW × actual time at that input × use days. Measured period kWh = sample kWh ÷ complete days × modeled use days.",
      "illustrativeExample": "Illustrative arithmetic: 1.5 kW continuously for five hours on each of 30 days uses 225 kWh and costs $45 at $0.20/kWh. An enabled thermostat window is not evidence that input stayed at 1.5 kW.",
      "interpretation": "This prices an appliance, not the room’s required heat or whole-home heating system. Equal watts for different durations can produce different energy; different comfort outcomes need separate context.",
      "questions": [
        {
          "question": "Is an oil-filled radiator automatically cheaper at the same watts?",
          "answer": "At the same constant electrical input and duration, the electricity arithmetic is the same. Controls, heat delivery and actual room operation may change the routine, which needs its own evidence."
        },
        {
          "question": "Can a blanket replace the room-heater calculation?",
          "answer": "Price heated bedding separately. Personal warming and room heating are different services; any claimed household saving needs a real change to the heating routine."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "est-electric-heating",
          "name": "Energy Saving Trust: Direct and secondary electric heating",
          "url": "https://energysavingtrust.org.uk/advice/electric-heating/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "probreeze-heater-types",
          "name": "Pro Breeze: Fan heaters, oil-filled radiators and thermostats",
          "url": "https://probreeze.com/blogs/news/what-portable-electric-heater-to-buy-fan-heaters-vs-oil-filled-radiators-vs-convector-heaters",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "dehumidifier",
      "canonical": "https://wattandhome.com/calculators/dehumidifier-running-cost/",
      "title": "Dehumidifier running-cost calculator",
      "summary": "A dehumidifier’s cost can be priced from input power and time or representative complete-day kWh. Moisture-removal capacity and litres per kWh describe performance, rather than direct household energy consumption.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Electrical input or measured energy",
          "unit": "W/kW, or measured kWh",
          "help": "A litres/day capacity or efficiency metric is not an electricity input."
        },
        {
          "name": "Mode and conditions",
          "unit": "Room temperature, humidity and target",
          "help": "Initial drying may not represent later maintenance use."
        },
        {
          "name": "Use days and tariff",
          "unit": "Chosen period days and price/kWh",
          "help": "Measured energy already contains cycling within the observation."
        }
      ],
      "formula": "Constant-input kWh = input kW × daily hours × use days. Measured kWh = complete sample kWh ÷ sample days × selected use days. Apply the electricity price once.",
      "illustrativeExample": "Illustrative arithmetic: 250 W continuously for eight hours on 30 days uses 60 kWh and costs $12 at $0.20/kWh. This does not infer the amount of water removed.",
      "interpretation": "Compare similar moisture-control tasks before ranking costs. A device enabled for 24 hours need not draw its maximum watts for every hour, and a shorter drying task may remove less water.",
      "questions": [
        {
          "question": "Can I use a manufacturer’s maximum extraction rate to infer daily kWh?",
          "answer": "No. That rate describes water removal under its test conditions. Use electrical input with suitable time, or an actual complete-day energy sample."
        },
        {
          "question": "How should I record water collected?",
          "answer": "Retain volume, energy, elapsed period and room conditions together. Cost per litre is descriptive for that observed task; it is not automatically performance in every room."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-dehumidifiers",
          "name": "ENERGY STAR: Dehumidifier efficiency and operating conditions",
          "url": "https://www.energystar.gov/products/dehumidifiers",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "meaco-dehumidifier-types",
          "name": "Meaco: Compressor and desiccant operating conditions",
          "url": "https://blog.meaco.com/when-to-buy-a-desiccant-dehumidifier-and-when-to-buy-a-compressor-dehumidifier/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "aircon",
      "canonical": "https://wattandhome.com/calculators/air-conditioner-running-cost/",
      "title": "Air-conditioner running-cost calculator",
      "summary": "Price an air conditioner using electrical input and a suitable routine, measured kWh, or its stated annual electrical label figure. Cooling capacity in BTU/h or thermal kW is a different quantity and must not be used as input watts.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Electrical energy basis",
          "unit": "Electrical W/kW, measured kWh, or label-year kWh",
          "help": "Match cooling/heating mode and climate where relevant."
        },
        {
          "name": "Cooling period",
          "unit": "Use time and seasonal days",
          "help": "A label year is priced directly rather than rescaled to household hours."
        },
        {
          "name": "Tariff",
          "unit": "Selected currency/kWh",
          "help": "Use the rate for the relevant cooling energy, keeping fixed charges separate."
        }
      ],
      "formula": "Power/time and measured modes project onto selected use days. Annual-label mode: cost = stated annual electrical kWh × entered rate, with no additional time multiplier.",
      "illustrativeExample": "Illustrative arithmetic: a constant 1 kW input for five hours on 90 days uses 450 kWh and costs $90 at $0.20/kWh. A separate 400 kWh label-year figure would cost $80 directly at that rate; it is a different basis.",
      "interpretation": "Compressor and fan input can vary with settings and conditions. The tool does not size cooling equipment or convert an efficiency ratio into a household kWh prediction.",
      "questions": [
        {
          "question": "Does 12,000 BTU/h mean 12,000 electrical watts?",
          "answer": "No. BTU/h describes heat-transfer capacity, not purchased electrical input. Find the electrical rating or a suitable energy measurement."
        },
        {
          "question": "Can I multiply an annual label by my own cooling hours?",
          "answer": "Not in this mode. The annual quantity already has a defined test context. Price it directly or use another compatible basis for your household routine."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-aircon-label",
          "name": "European Commission: Air-conditioner labels and comfort fans",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/air-conditioners-and-comfort-fans_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-room-ac",
          "name": "ENERGY STAR: Room air-conditioner metrics and operation",
          "url": "https://www.energystar.gov/products/room_air_conditioners/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "cooking",
      "canonical": "https://wattandhome.com/calculators/air-fryer-vs-oven-cost/",
      "title": "Air fryer vs oven electricity-cost calculator",
      "summary": "Compare the same complete meal in an air fryer and electric oven, including all portions, batches and preheating. Each option can use measured whole-meal energy or an explicitly constant-power estimate.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Comparable complete meal",
          "unit": "Same portions and cooking outcome",
          "help": "A single basket and a whole oven meal are not necessarily the same task."
        },
        {
          "name": "Energy for each option",
          "unit": "Whole-meal kWh, or input W and times",
          "help": "Power estimates keep cooking and preheat sessions separate; measured energy already includes them."
        },
        {
          "name": "Routine and tariff",
          "unit": "Meals/week and price/kWh",
          "help": "Annual differences use 52 weeks and the entered constant tariff."
        }
      ],
      "formula": "Power-based meal kWh = kW × (cook minutes/batch × batches + preheat minutes × preheat sessions) ÷ 60. Measured meal kWh is used directly. Cost difference = (oven meal kWh − air-fryer meal kWh) × tariff.",
      "illustrativeExample": "Illustrative measured-task arithmetic: 0.6 kWh for one complete method versus 1.2 kWh for the other differs by 0.6 kWh, or $0.12 at $0.20/kWh. Four equivalent meals/week across 52 weeks give $24.96 of electricity difference.",
      "interpretation": "Energy savings alone do not recover an unentered purchase price. Additional batches, another side dish or a different outcome can change the relevant task; the example is not cooking-time guidance.",
      "questions": [
        {
          "question": "Should I multiply measured meal energy by the number of batches?",
          "answer": "No. In measured mode, enter energy already covering the complete meal and all batches. Multiplying it again would overcount."
        },
        {
          "question": "Can one option be measured and the other estimated?",
          "answer": "The tool allows it, but their evidence differs. Preserve each basis and repeat suitable measurements before presenting the result as an observed product comparison."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "est-cooking",
          "name": "Energy Saving Trust: Air fryer, oven and cooking comparisons",
          "url": "https://energysavingtrust.org.uk/air-fryer-oven-microwave-hob-slow-cooker-cheaper-cooking/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "planner",
      "canonical": "https://wattandhome.com/calculators/household-appliance-cost-planner/",
      "title": "Household appliance-cost planner",
      "summary": "Build an annual plan from non-overlapping appliance quantities, keeping each row’s energy basis. The total covers only listed appliances, not automatically the whole household bill.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Separate appliances",
          "unit": "Name, quantity and energy basis per row",
          "help": "Do not list a complete device measurement and overlapping component estimates together."
        },
        {
          "name": "Routine for each row",
          "unit": "Weekly cycles, use days or complete-day sample",
          "help": "Annual declarations are direct; other bases need compatible household routines."
        },
        {
          "name": "Shared tariff",
          "unit": "Selected currency/kWh",
          "help": "Monthly and daily outputs are annual averages, not seasonal bills."
        }
      ],
      "formula": "Annual row energy = quantity × its normalized annual kWh. Sum rows, then multiply by the common tariff. Monthly annual average = annual total ÷ 12.",
      "illustrativeExample": "Illustrative arithmetic: a 300 kWh/year fridge plus 100 kWh/year of separately counted laundry totals 400 kWh/year. At $0.20/kWh, listed electricity costs $80/year. Unlisted loads and fixed charges remain outside that sum.",
      "interpretation": "Check overlapping energy boundaries, associated water heating and year-versus-season inputs before transferring energy to a tariff scenario or bill check. A bill-period check needs an appropriate period routine rather than blind annual proration.",
      "questions": [
        {
          "question": "Why is the planner smaller than my electricity bill?",
          "answer": "You may have unlisted loads, a different period or conditions, fixed fees or tariff structure. The tool intentionally prices only the listed energy; use the bill check to investigate aligned kWh."
        },
        {
          "question": "Can I use this as a whole-bill tariff comparison?",
          "answer": "Only if the energy input represents the relevant whole-home consumption. A partial appliance list is not automatically the whole home’s annual kWh."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "tariff",
      "canonical": "https://wattandhome.com/calculators/time-of-use-tariff-comparison/",
      "title": "Time-of-use and electricity-tariff comparison",
      "summary": "Compare two tariffs using the same annual electricity quantity, an energy-based off-peak share and each tariff’s fixed charges. A shifted-use scenario changes the energy split rather than inventing lower consumption.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Annual electricity and year",
          "unit": "kWh and 365/366 days",
          "help": "Use whole-home energy if comparing a whole electricity bill."
        },
        {
          "name": "Both tariff quotes",
          "unit": "Peak/off-peak price per kWh; fixed price/day",
          "help": "Keep tax and quote scope consistent; currency does not convert prices."
        },
        {
          "name": "Off-peak share",
          "unit": "Percent of kWh, not percent of hours",
          "help": "Use actual time windows and a feasible routine for a shifting scenario."
        }
      ],
      "formula": "Off-peak kWh = annual kWh × off-peak percentage ÷ 100. Total = off-peak kWh × off-peak rate + remaining kWh × peak rate + daily fixed charge × year days.",
      "illustrativeExample": "Illustrative arithmetic: 1,000 kWh split 40% at $0.10 and 60% at $0.30 costs $220 for energy. A $0.50 daily charge across 365 days adds $182.50, making $402.50 before any excluded charges.",
      "interpretation": "Tiered rates, demand fees, discounts and exit costs are excluded. A larger off-peak share is a scenario, not evidence every appliance can be run in that window or that the tariff suits a particular household.",
      "questions": [
        {
          "question": "Can half my operating hours be entered as 50% off-peak energy?",
          "answer": "Only if half the electricity actually falls in that window. Higher-power operation can concentrate kWh in fewer hours."
        },
        {
          "question": "Why can a lower unit rate still produce a higher total?",
          "answer": "A higher fixed daily charge or a less favourable peak/off-peak split can offset that rate. Read the complete comparable totals."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "est-time-tariffs",
          "name": "Energy Saving Trust: Time-of-use tariffs",
          "url": "https://energysavingtrust.org.uk/should-i-switch-to-a-time-of-use-tariff/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "ofgem-bill",
          "name": "Ofgem: How an energy bill is calculated",
          "url": "https://www.ofgem.gov.uk/your-energy-supply/your-energy-bill/how-your-electricity-or-gas-bill-calculated",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "label-reader",
      "canonical": "https://wattandhome.com/calculators/energy-label-reader/",
      "title": "Guided appliance energy-label reader",
      "summary": "Choose the appliance and its actual label market, read the stated energy quantity and unit, and transfer manually entered figures to a suitable tool. The illustration explains fields and is not an official tested label.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Market and task",
          "unit": "US, GB, NI or EU; appliance programme",
          "help": "A currency selection does not identify a label regime."
        },
        {
          "name": "Exact consumption figure",
          "unit": "kWh with annual, cycle or other stated basis",
          "help": "A letter grade, printed currency cost or efficiency ratio is not interchangeable with kWh."
        },
        {
          "name": "Model context",
          "unit": "Capacity, mode and source document",
          "help": "For washer-dryers, distinguish washing-only from complete wash-and-dry tasks."
        }
      ],
      "formula": "Use annual kWh directly, per-cycle kWh directly for one task, or divide per-100-cycle energy by 100. Apply household frequency only to compatible cycle figures.",
      "illustrativeExample": "Illustrative arithmetic: a source showing 50 kWh/100 cycles supplies 0.5 kWh/cycle. Four cycles/week give 104 kWh over 52 weeks; at $0.20/kWh that is $20.80/year.",
      "interpretation": "Read the actual printed unit rather than reconstructing it from an efficiency letter or document colour. A transfer carries source context; it does not verify the model or convert its market.",
      "questions": [
        {
          "question": "Does the label reader recognize a photograph automatically?",
          "answer": "No. It is a guided manual reading and transfer workflow. Check the exact value and units against the original label or product sheet."
        },
        {
          "question": "What should I do if the retailer shows a different label version?",
          "answer": "Confirm the full model identifier, market and source with the supplier. Keep different test bases distinct rather than selecting whichever number looks cheaper."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-label-explained",
          "name": "European Commission: Understanding the energy label",
          "url": "https://energy-efficient-products.ec.europa.eu/ecodesign-and-energy-label/understanding-energy-label_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "uk-energy-labels",
          "name": "GOV.UK: Energy labelling in Great Britain and Northern Ireland",
          "url": "https://www.gov.uk/guidance/the-energy-labelling-of-products",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "eu-eprel",
          "name": "European Commission: EPREL for consumers",
          "url": "https://energy-efficient-products.ec.europa.eu/consumers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "scenarios",
      "canonical": "https://wattandhome.com/calculators/appliance-cost-scenarios/",
      "title": "What changes your appliance cost?",
      "summary": "Explore how alternative assumptions change an appliance’s electricity cost or replacement payback. The three scenarios show sensitivity to entered energy, tariff and cost assumptions, not probabilities or a forecast.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Scenario mode",
          "unit": "Running cost or replacement",
          "help": "Choose the baseline before comparing assumptions."
        },
        {
          "name": "Base energy and costs",
          "unit": "Annual electrical kWh and relevant outlay",
          "help": "Use compatible sources and a confirmed replacement baseline."
        },
        {
          "name": "Changed assumptions",
          "unit": "Energy, rate and cost changes",
          "help": "Label lower/base/higher inputs explicitly rather than calling them likely outcomes."
        }
      ],
      "formula": "Running cost = adjusted annual kWh × adjusted tariff. Replacement savings = annual energy difference × adjusted tariff; payback needs a positive saving and relevant positive net outlay.",
      "illustrativeExample": "Illustrative arithmetic: 600 kWh/year at $0.20/kWh costs $120. A scenario with 20% more energy and the same rate costs $144. This shows the effect of an assumption; it is not evidence of a 20% measurement error.",
      "interpretation": "If energy and rate both increase, their effects multiply. Keep the assumptions explicit, and treat missing future repairs or tariff changes as unknown rather than adding invented probabilities.",
      "questions": [
        {
          "question": "Is the lower scenario a guaranteed saving?",
          "answer": "No. It is the output for the lower entered assumptions. Whether those assumptions occur needs evidence outside the calculator."
        },
        {
          "question": "Why does payback disappear in one scenario?",
          "answer": "If that scenario has no positive electricity savings, a positive outlay has no electricity-savings payback. A zero net outlay is reported separately."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": []
    },
    {
      "id": "standby",
      "canonical": "https://wattandhome.com/calculators/standby-running-cost/",
      "title": "Always-on and standby electricity cost calculator",
      "summary": "Sum selected always-on or standby modes across devices using average watts, their daily mode hours, quantities and use days. An optional reduced-hours scenario prices only the periods you identify as removable.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Each device and source",
          "unit": "Average W, quantity and source/assumption",
          "help": "An adapter rating or maximum input is not measured standby draw."
        },
        {
          "name": "Current mode hours",
          "unit": "Hours/day and annual use days",
          "help": "A working router is always-on active networking, not automatically standby."
        },
        {
          "name": "Proposed hours and tariff",
          "unit": "Optional hours ≤ current hours; currency/kWh",
          "help": "Blank proposed hours retain current use."
        }
      ],
      "formula": "Annual device kWh = watts ÷ 1,000 × mode hours/day × use days × quantity. Savings compare the entered current and proposed hours at the same draw and tariff.",
      "illustrativeExample": "Illustrative arithmetic: 10 W for 24 hours on 365 days uses 87.6 kWh and costs $17.52 at $0.20/kWh. Reducing that mode to 12 hours would halve this particular arithmetic quantity, if the period can actually be removed.",
      "interpretation": "The audit describes selected device modes. Do not add them to a whole-day or whole-home reading that already contains them. Savings do not establish that switching a service off is practical or appropriate.",
      "questions": [
        {
          "question": "Are all always-on watts wasted?",
          "answer": "No. Networking, controls or another continuing service may be the intended task. Evaluate which mode and period can actually change."
        },
        {
          "question": "Can I model several states of one device here?",
          "answer": "Use non-overlapping periods, or use the shared operating-mode editor in the electricity tool to make the one-device 24-hour boundary explicit."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "doe-standby-measurement",
          "name": "US Department of Energy: Measuring standby power",
          "url": "https://www.energy.gov/cmei/femp/measuring-standby-power",
          "region": "US",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "eu-standby-modes",
          "name": "European Commission: Standby, networked standby and off mode",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/standby-networked-standby-and-mode_en",
          "region": "EU",
          "checkedOn": "2026-10-14"
        }
      ]
    },
    {
      "id": "bill-check",
      "canonical": "https://wattandhome.com/calculators/electricity-bill-appliance-check/",
      "title": "Electricity bill and appliance kWh check",
      "summary": "Compare appliance energy with billed gross household kWh over the same start-to-next-reading interval. Keep period counts, evidence and overlapping loads explicit; any unexplained difference is not automatically waste or a billing error.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Billing boundary",
          "unit": "Start date included; end reading date excluded; gross kWh",
          "help": "Net imports alone can differ from consumption when solar or batteries are involved."
        },
        {
          "name": "Appliance rows",
          "unit": "Actual cycles, representative daily energy, power/time or annual estimate",
          "help": "Each row lies within the bill interval and identifies observed or estimated evidence."
        },
        {
          "name": "Overlap review",
          "unit": "Confirmation and source context",
          "help": "Do not list a complete measurement alongside component rows already inside it."
        }
      ],
      "formula": "Difference = billed gross kWh − sum of compatible period appliance kWh. Accounted percentage = entered appliance kWh ÷ billed kWh × 100, only when billed kWh is nonzero.",
      "illustrativeExample": "Illustrative arithmetic: a 30-day bill shows 300 kWh and non-overlapping listed appliances total 180 kWh. The listed share is 60% and the difference is 120 kWh. This does not identify which unlisted appliances used that energy.",
      "interpretation": "Annual-label proration is a uniform estimate, not an observation of a seasonal bill. A negative difference is retained as an overage for review rather than silently forced to zero.",
      "questions": [
        {
          "question": "Can an import-only bill be used as gross consumption?",
          "answer": "Not without reconciling onsite generation, exports, batteries and the applicable energy boundary. Confirm a comparable gross-consumption figure first."
        },
        {
          "question": "Does a large difference prove a faulty meter?",
          "answer": "No. Missing loads, date or scope mismatches and estimates can explain it. The tool organizes a check; it does not diagnose the meter or the bill."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "eia-reading-electricity-meter",
          "name": "US EIA: Measuring electricity and utility meters",
          "url": "https://www.eia.gov/energyexplained/electricity/measuring-electricity.php",
          "region": "US",
          "checkedOn": "2026-10-14"
        }
      ]
    },
    {
      "id": "lighting",
      "canonical": "https://wattandhome.com/calculators/lighting-cost-and-led-payback/",
      "title": "Lighting cost and LED replacement calculator",
      "summary": "Compare lighting electricity on a matched routine and suitable light output, then check how long positive electricity savings take to cover the replacement outlay. Input watts and equivalent-incandescent watts are different quantities.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Current and replacement bulbs",
          "unit": "Actual input W and confirmed suitable lumens/fittings",
          "help": "Use comparable light output, dimming and fitting context."
        },
        {
          "name": "Quantity and schedule",
          "unit": "Bulbs, hours/day and use days/year",
          "help": "Use separate scenarios for different rooms or schedules."
        },
        {
          "name": "Replacement outlay and tariff",
          "unit": "Price/bulb, total installation and price/kWh",
          "help": "The cost of keeping already-owned working bulbs excludes their old purchase price."
        }
      ],
      "formula": "Annual energy = watts ÷ 1,000 × quantity × hours/day × days. Annual saving = (current − replacement kWh) × tariff. Simple payback = new outlay ÷ positive annual saving.",
      "illustrativeExample": "Illustrative arithmetic: five 60 W bulbs versus five 9 W bulbs, four hours/day and 365 days, save 372.3 kWh/year. At $0.20/kWh the saving is $74.46. A $15 replacement outlay has about 0.201 years of simple payback.",
      "interpretation": "The confirmation is a visitor review, not an automated fitting or lighting-design test. Payback does not forecast lamp life. Smart-control standby or an unentered installation charge can change the relevant cost scope.",
      "questions": [
        {
          "question": "Can a bulb with more lumens still be compared?",
          "answer": "Assess whether it provides the suitable service you actually need. Matching a task is more useful than ranking watts for different brightness or distribution."
        },
        {
          "question": "What if I am changing bulbs only after failure?",
          "answer": "That is a choice between new purchases rather than replacing working bulbs. Compare the extra price of suitable new options and their electricity difference."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "est-lighting",
          "name": "Energy Saving Trust: light output, compatibility and energy-saving lighting",
          "url": "https://energysavingtrust.org.uk/advice/lighting/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "eu-light-sources",
          "name": "European Commission: light-source labels and electrical energy units",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/light-sources_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "blanket",
      "canonical": "https://wattandhome.com/calculators/electric-blanket-running-cost/",
      "title": "Electric-blanket running-cost calculator",
      "summary": "Price heated bedding from separately timed preheat, selected-setting and standby modes, or a complete measured routine. Choose seasonal use days without assuming that personal warming and space heating provide the same service.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Mode or sample basis",
          "unit": "Average W and separate hours, or complete-day kWh",
          "help": "A maximum rating is not necessarily the average at a lower setting."
        },
        {
          "name": "Quantity and use days",
          "unit": "Identical appliances and chosen period days",
          "help": "Check whether a reading covers one side, both controls or the complete device."
        },
        {
          "name": "Tariff and context",
          "unit": "Currency/kWh, setting and source",
          "help": "Keep the product’s permitted use and timer instructions with the routine."
        }
      ],
      "formula": "Modes: daily kWh = sum average W × separate hours ÷ 1,000. Measured: daily kWh = sample kWh ÷ complete sample days. Period energy = daily kWh × quantity × use days.",
      "illustrativeExample": "Illustrative arithmetic: 100 W for 0.5 hours, 40 W for four hours and 0.3 W for 19.5 hours total 0.21585 kWh/day. One device over 90 days costs $3.8853 at $0.20/kWh, displayed as $3.89.",
      "interpretation": "Captured cycling is already in the measured sample. Do not add another duty-cycle reduction. The example is a cost fixture, not permission to operate a particular blanket for those hours.",
      "questions": [
        {
          "question": "Should I multiply a two-person blanket reading by two?",
          "answer": "Only if the source is for one separately measured unit and you really have two identical units. A complete-device reading may already include both sides."
        },
        {
          "question": "Can I subtract this cost from a room-heater bill?",
          "answer": "Only with evidence that the room-heating routine changes on a comparable comfort and usage basis. The two appliances provide different services."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "esf-blankets",
          "name": "Electrical Safety First: electric blanket use, condition and manufacturer instructions",
          "url": "https://www.electricalsafetyfirst.org.uk/press-and-media/concerns-as-electric-blanket-fires-hit-five-year-high/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "shower",
      "canonical": "https://wattandhome.com/calculators/electric-shower-running-cost/",
      "title": "Electric-shower cost calculator",
      "summary": "For a point-of-use electric shower, selected electrical kW times minutes gives shower energy. Add an optional measured-flow water charge separately, and keep power, flow and shower count fixed in a shorter-duration scenario.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Selected electrical input",
          "unit": "kW",
          "help": "A mixer shower or pump-only rating needs another heat-source boundary."
        },
        {
          "name": "Routine",
          "unit": "Minutes/shower, showers/day and use days",
          "help": "The total selected shower duration must fit within one day."
        },
        {
          "name": "Optional variable water charge",
          "unit": "Measured litres/minute and matching billed price",
          "help": "Use the same operating setting; do not add a second heating-energy charge."
        }
      ],
      "formula": "Shower kWh = input kW × minutes ÷ 60. Period electricity = shower kWh × shower count × tariff. Water cost uses flow × minutes × count with the matching volume price.",
      "illustrativeExample": "Illustrative arithmetic: 9 kW for eight minutes uses 1.2 kWh, or $0.24 of electricity at $0.20/kWh. Four showers/day over 365 days cost $350.40 for electricity; optional water charges are additional.",
      "interpretation": "Changing selected power or inlet conditions can change the useful comparison. A shorter-duration result is conditional on the entered fixed inputs and is not a universal household saving.",
      "questions": [
        {
          "question": "Can I use the tool for a shower supplied from a hot-water tank?",
          "answer": "Not with the point-of-use input method. Use an appropriate water-heater energy boundary, and retain any separately measured pumping electricity if relevant."
        },
        {
          "question": "What if my water bill has no per-volume charge?",
          "answer": "Leave water cost excluded or enter a known zero variable price if that is appropriate to your bill. Fixed fees are not avoided by one shorter shower."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "est-showers",
          "name": "Energy Saving Trust: hot-water use and shower routines",
          "url": "https://energysavingtrust.org.uk/top-tips-to-save-energy-and-money-in-the-bathroom/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "nist-gallon",
          "name": "NIST: US customary and metric volume conversion factors",
          "url": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "kettle",
      "canonical": "https://wattandhome.com/calculators/kettle-running-cost/",
      "title": "Kettle electricity-cost calculator",
      "summary": "Use complete-boil electricity or an explicitly steady power/time estimate for the same water task. Add keep-warm electricity only outside that boundary; the optional water-volume field describes the task and does not rescale measured energy.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Complete-boil source",
          "unit": "Measured kWh/boil, or input W and minutes",
          "help": "Keep water volume, starting temperature and endpoint comparable."
        },
        {
          "name": "Routine",
          "unit": "Boils/day and chosen use days",
          "help": "Use the number of complete boils, including actual reboiling where relevant."
        },
        {
          "name": "Separate warming",
          "unit": "Average W and hours outside the boil measurement",
          "help": "Do not add warming already captured in the energy reading."
        }
      ],
      "formula": "Boiling energy = complete-boil kWh × boils/day × use days. Add separate keep-warm W ÷ 1,000 × warming hours/day × days. Apply the tariff to the sum.",
      "illustrativeExample": "Illustrative arithmetic: 0.1 kWh per complete boil, four boils/day and 365 use days give 146 kWh and $29.20 at $0.20/kWh. Separate 20 W warming for two hours/day adds 14.6 kWh and $2.92.",
      "interpretation": "A more powerful kettle may finish a task sooner; watts alone do not establish complete-boil energy. The numerical example is not a measured product or a claim that every litre requires 0.1 kWh.",
      "questions": [
        {
          "question": "Does entering litres change the measured kWh?",
          "answer": "No. It provides task context and kWh/litre for that reading. A larger volume needs its own measured or documented energy rather than an automatic adjustment."
        },
        {
          "question": "How do I average several boils?",
          "answer": "Divide accumulated energy for comparable complete boils by their count. Preserve the individual task conditions and avoid including unrelated keep-warm periods without identifying them."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "est-kettle",
          "name": "Energy Saving Trust: only heat the water needed for the task",
          "url": "https://energysavingtrust.org.uk/your-top-five-tips-to-save-energy-in-the-kitchen/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "purifier",
      "canonical": "https://wattandhome.com/calculators/air-purifier-running-cost/",
      "title": "Air-purifier running and filter-cost calculator",
      "summary": "Estimate electricity for each air-cleaner operating mode or a representative daily measurement, then add an optional filter accrual budget. Lower watts do not establish equivalent clean-air delivery, noise or room suitability.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Electricity basis",
          "unit": "Mode W/hours or measured complete-day kWh",
          "help": "Use power for the actual speed or the captured automatic routine."
        },
        {
          "name": "Performance context",
          "unit": "CADR, pollutant, unit, speed and conditions",
          "help": "Maximum-speed performance is not a declaration for every low-power setting."
        },
        {
          "name": "Filter budget",
          "unit": "Full-set price, interval in months, calendar budget days",
          "help": "Calendar budget days are independent from electricity use days."
        }
      ],
      "formula": "Electricity = daily electrical kWh × use days × quantity × tariff. Filter accrual = set price × 12 ÷ interval months × calendar days ÷ 365 × quantity.",
      "illustrativeExample": "Illustrative arithmetic: 40 W for eight hours plus 10 W for 16 hours uses 0.48 kWh/day. One device for 365 days at $0.20/kWh costs $35.04. A $40 filter set every 12 months adds $40 annual accrual, making a $75.04 budget.",
      "interpretation": "Accrual is not a purchase-date forecast or guaranteed filter life. Measured electricity already contains captured speed changes and idle use; keep performance and source context when comparing routines.",
      "questions": [
        {
          "question": "Can I use the highest CADR with the lowest-watt setting?",
          "answer": "Only if the source explicitly reports that combination. Usually each tested speed needs its own matching performance context; do not pair unrelated figures."
        },
        {
          "question": "Why are filter calendar days separate from operating days?",
          "answer": "A chosen electricity routine can run only on some days of a longer budget period. The entered replacement interval and calendar period define accrual; actual replacement needs depend on the product and conditions."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "energy-star-air-cleaner-criteria",
          "name": "ENERGY STAR: room air-cleaner power, CADR and filter reporting",
          "url": "https://www.energystar.gov/products/air_purifiers_cleaners/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "energy-star-air-cleaners",
          "name": "ENERGY STAR: air-cleaner room suitability and clean-air delivery",
          "url": "https://www.energystar.gov/products/air_cleaners",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "water-heater",
      "canonical": "https://wattandhome.com/calculators/electric-water-heater-running-cost/",
      "title": "Electric water-heater cost calculator",
      "summary": "Price a water heater from measured or declared electrical energy, actual resistance-element on-time, or a clearly bounded resistance-heating scenario. Purchased electricity, useful water heat and stored-water losses have different boundaries.",
      "reviewedOn": "2026-10-15",
      "inputs": [
        {
          "name": "Electrical source",
          "unit": "Measured kWh/days or declared electrical kWh/year",
          "help": "Keep draw profile, climate, operating mode and meter boundary with the figure."
        },
        {
          "name": "Resistance alternatives",
          "unit": "Actual input kW/on-hours or volume/temperature rise",
          "help": "A timer window is not necessarily element-on time; the volume scenario does not model heat-pump efficiency."
        },
        {
          "name": "Losses and tariff",
          "unit": "Explicit additional electrical losses and currency/kWh",
          "help": "Measured or declared input already contains losses within its boundary; never add them again."
        }
      ],
      "formula": "Measured input: sample kWh ÷ complete days × use days. Annual declaration: annual electrical kWh directly. Simplified useful heat = litres × temperature rise in °C × 4.186 ÷ 3,600; divide by resistance conversion fraction and add only explicit extra electrical losses.",
      "illustrativeExample": "Illustrative arithmetic: 42 electrical kWh over seven complete days average 6 kWh/day. Projected onto 30 use days at $0.20/kWh, that is 180 kWh and $36. The figures are a selected arithmetic sample, not an observed household test.",
      "interpretation": "The thermal mode assumes liquid-water density 1 kg/litre and fixed heat capacity 4.186 kJ/(kg·°C). Temperatures describe the task, not a recommended thermostat setting. The tool does not design installations, size tanks or infer heat-pump COP.",
      "questions": [
        {
          "question": "Can I price a heat-pump water heater here?",
          "answer": "Yes with compatible measured or declared electrical consumption. Do not use the resistance-only volume scenario to infer compressor efficiency or backup-element operation."
        },
        {
          "question": "Are standing losses added to my measured kWh?",
          "answer": "No. The reading already contains electricity inside its meter boundary. Only the simplified resistance scenario has an explicit extra electrical-loss allowance."
        }
      ],
      "methodology": "https://wattandhome.com/methodology/",
      "sources": [
        {
          "id": "eu-water-heaters",
          "name": "European Commission: water-heater types, label profiles and energy",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/water-heaters_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "doe-hpwh-study-record",
          "name": "US Department of Energy: NBI 2023 plug-in HPWH field-study record",
          "url": "https://heatpumpdata.energy.gov/data/studies/nbi-2023-plug-hpwh",
          "region": "US",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    }
  ],
  "guides": [
    {
      "id": "kwh-per-100-cycles",
      "canonical": "https://wattandhome.com/energy-labels/kwh-per-100-cycles/",
      "title": "What does “kWh per 100 cycles” mean?",
      "question": "What does kWh per 100 cycles mean and what does one load cost?",
      "shortAnswer": "Divide the stated kWh per 100 cycles by 100 to obtain the corresponding per-cycle energy, then multiply by your electricity price. Annualizing uses your compatible weekly cycle count and 52 weeks. A weighted eco declaration is a test basis, rather than a promise for every programme or load.",
      "topic": "Labels",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/washing-machine-running-cost/",
      "sources": [
        {
          "id": "eu-washing-label",
          "name": "European Commission: Washing-machine energy labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/washing-machines_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-wan28258-label",
          "name": "Bosch: WAN28258GB energy label, 46 kWh per 100 cycles",
          "url": "https://media3.bsh-group.com/Documents/energylabel/en-GB/WAN28258GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-wan28258-fiche",
          "name": "Bosch: WAN28258GB product information sheet, dated 28 November 2025",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WAN28258GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "us-energyguide-running-cost",
      "canonical": "https://wattandhome.com/energy-labels/us-energyguide-running-cost/",
      "title": "US EnergyGuide running costs: use annual kWh and your local rate",
      "question": "Why does my electricity bill differ from the EnergyGuide yellow label?",
      "shortAnswer": "The yellow EnergyGuide dollar estimate uses standardized price and usage assumptions. Apply your own dollars-per-kWh tariff to a compatible annual energy quantity for a household scenario. Check any associated hot-water or drying scope, and keep the printed comparison estimate distinct from measured use in your home.",
      "topic": "Labels",
      "region": "US",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/energy-label-reader/",
      "sources": [
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "us-washer-label",
          "name": "ENERGY STAR: Clothes-washer energy metrics",
          "url": "https://www.energystar.gov/products/clothes_washers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "us-dishwasher-label",
          "name": "ENERGY STAR: Dishwasher energy metrics",
          "url": "https://www.energystar.gov/products/dishwashers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-wrt549-record",
          "name": "ENERGY STAR: Whirlpool WRT549SZD*, registry ID 2218984",
          "url": "https://www.energystar.gov/productfinder/product/certified-residential-refrigerators/details/2218984/export/pdf",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "kw-vs-kwh",
      "canonical": "https://wattandhome.com/guides/kw-vs-kwh/",
      "title": "kW and kWh: the difference that matters",
      "question": "What is the difference between kW and kWh for appliance costs?",
      "shortAnswer": "kW measures power, the rate of electricity use; kWh measures energy used over time. A constant 1 kW draw for one hour uses 1 kWh. Convert watts to kW by dividing by 1,000, then multiply by hours to obtain energy. Electricity cost uses kWh multiplied by your price per kWh.",
      "topic": "Energy basics",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "energy-rating-a-to-g",
      "canonical": "https://wattandhome.com/energy-labels/energy-rating-a-to-g/",
      "title": "A to G energy ratings: compare the figure as well as the letter",
      "question": "How do A to G energy ratings compare with old A plus labels?",
      "shortAnswer": "An efficiency class compares a product within its appliance-category and label-version rules. It does not supply a household running cost. Check the declared kWh, capacity and programme, then apply your tariff; old A-plus classes and rescaled A–G classes cannot be treated as interchangeable energy quantities.",
      "topic": "Labels",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/appliance-comparison/",
      "sources": [
        {
          "id": "eu-label-explained",
          "name": "European Commission: Understanding the energy label",
          "url": "https://energy-efficient-products.ec.europa.eu/ecodesign-and-energy-label/understanding-energy-label_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-fridge-label",
          "name": "European Commission: Fridge and freezer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/fridges-and-freezers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "uk-energy-labels-gb-ni",
      "canonical": "https://wattandhome.com/energy-labels/uk-energy-labels-gb-ni/",
      "title": "UK appliance energy labels: Great Britain and Northern Ireland",
      "question": "Are appliance energy labels the same in Great Britain and Northern Ireland?",
      "shortAnswer": "Great Britain and Northern Ireland can use different energy-label regimes. Check the market, full model identifier, applicable label and information sheet before choosing an energy input. The printed unit and programme matter to the calculation; a GB document does not automatically establish an EU or Northern Ireland model record.",
      "topic": "Labels",
      "region": "UK",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/tumble-dryer-running-cost/",
      "sources": [
        {
          "id": "uk-energy-labels",
          "name": "GOV.UK: Energy labelling in Great Britain and Northern Ireland",
          "url": "https://www.gov.uk/guidance/the-energy-labelling-of-products",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "uk-dryer-transition",
          "name": "GOV.UK: Great Britain tumble-dryer label transition",
          "url": "https://www.gov.uk/government/consultations/raising-product-standards-for-household-tumble-dryers/outcome/raising-standards-for-household-tumble-dryers-government-response-accessible-webpage",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "eu-dryer-label",
          "name": "European Commission: Tumble-dryer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/tumble-dryers_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "fridge-energy-label",
      "canonical": "https://wattandhome.com/energy-labels/fridge-energy-label/",
      "title": "Reading a fridge or freezer energy label",
      "question": "How do I read annual kWh and capacity on a fridge energy label?",
      "shortAnswer": "Find the fridge or freezer’s compatible annual kWh and multiply it by your own tariff. Capacity and noise are separate label information. The dollar estimate on a US EnergyGuide label is not a kWh input, and an annual consumption figure should not be multiplied by daily running hours again.",
      "topic": "Labels",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/fridge-running-cost/",
      "sources": [
        {
          "id": "eu-fridge-label",
          "name": "European Commission: Fridge and freezer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/fridges-and-freezers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "dishwasher-energy-label",
      "canonical": "https://wattandhome.com/energy-labels/dishwasher-energy-label/",
      "title": "Dishwasher energy labels: kWh, water and cycle time",
      "question": "What do dishwasher kWh per 100 cycles, water use and duration mean?",
      "shortAnswer": "An EU dishwasher label states electricity per 100 eco cycles and water per cycle; programme duration is elapsed time. Divide the electricity figure by 100 before pricing one stated cycle. Capacity and noise inform a purchase choice, while other programmes and US energy boundaries need their own compatible inputs.",
      "topic": "Labels",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/dishwasher-running-cost/",
      "sources": [
        {
          "id": "eu-dishwasher-label",
          "name": "European Commission: Dishwasher labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/dishwashers_en",
          "region": "EU",
          "checkedOn": "2026-10-02"
        },
        {
          "id": "us-dishwasher-label",
          "name": "ENERGY STAR: Dishwasher energy metrics",
          "url": "https://www.energystar.gov/products/dishwashers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-smd6ycx01-label",
          "name": "Bosch SMD6YCX01G energy label: kWh per 100 cycles, capacity and water",
          "url": "https://media3.bsh-group.com/Documents/energylabel/en-GB/SMD6YCX01G.pdf",
          "region": "UK",
          "checkedOn": "2026-10-02"
        },
        {
          "id": "bosch-smd6ycx01-fiche",
          "name": "Bosch SMD6YCX01G product information sheet: eco cycle energy and duration",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/SMD6YCX01G.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        }
      ]
    },
    {
      "id": "tumble-dryer-label-2025",
      "canonical": "https://wattandhome.com/energy-labels/tumble-dryer-label-2025/",
      "title": "The EU tumble-dryer label introduced in 2025",
      "question": "What changed on the EU tumble-dryer energy label in July 2025?",
      "shortAnswer": "The EU dryer label introduced in July 2025 uses A–G classes and weighted eco energy per 100 drying cycles. Divide that energy by 100 before pricing one stated cycle. Older annual labels and Great Britain’s transition context must be read on their own units and test bases rather than mixed into that cycle calculation.",
      "topic": "Labels",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/tumble-dryer-running-cost/",
      "sources": [
        {
          "id": "eu-dryer-label",
          "name": "European Commission: Tumble-dryer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/tumble-dryers_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "uk-energy-labels",
          "name": "GOV.UK: Energy labelling in Great Britain and Northern Ireland",
          "url": "https://www.gov.uk/guidance/the-energy-labelling-of-products",
          "region": "UK",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "washer-dryer-two-energy-figures",
      "canonical": "https://wattandhome.com/energy-labels/washer-dryer-two-energy-figures/",
      "title": "Washer-dryer labels: washing only versus a complete cycle",
      "question": "Why does a washer-dryer label show two energy figures and capacities?",
      "shortAnswer": "Choose the washer-dryer label’s washing-only or complete wash-and-dry figure for the task you actually run, with its matching unit and capacity. The complete-task energy already includes washing. Adding the washing-only quantity again would double-count that stage; separately run tasks need non-overlapping inputs.",
      "topic": "Labels",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/washing-machine-running-cost/",
      "sources": [
        {
          "id": "eu-washer-dryer-label",
          "name": "European Commission: Washer-dryer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/washer-dryers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "eprel-product-information",
      "canonical": "https://wattandhome.com/energy-labels/eprel-product-information/",
      "title": "EPREL lookup: check an appliance model and energy label",
      "question": "How do I use an energy-label QR code and EPREL product information sheet?",
      "shortAnswer": "Use an applicable EU label QR code or the official EPREL search to find the complete model identifier. Retain capacity, programme, energy unit and document version before comparing candidates. The registry supplies declared product information, while your electricity tariff, routine and confirmed purchase quote remain separate.",
      "topic": "Labels",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/appliance-comparison/",
      "sources": [
        {
          "id": "eu-eprel",
          "name": "European Commission: EPREL for consumers",
          "url": "https://energy-efficient-products.ec.europa.eu/consumers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-label-explained",
          "name": "European Commission: Understanding the energy label",
          "url": "https://energy-efficient-products.ec.europa.eu/ecodesign-and-energy-label/understanding-energy-label_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eprel-model-comparison",
          "name": "European Commission: EPREL model comparison introduced 20 July 2026",
          "url": "https://energy-efficient-products.ec.europa.eu/news/new-eprel-comparison-tool-support-sustainable-purchasing-2026-07-20_en",
          "region": "EU",
          "checkedOn": "2026-10-03"
        }
      ]
    },
    {
      "id": "find-electricity-unit-rate",
      "canonical": "https://wattandhome.com/guides/find-electricity-unit-rate/",
      "title": "Electricity price per kWh: which bill rate to use",
      "question": "Where do I find my electricity price per kWh and should I add standing charges?",
      "shortAnswer": "Use the consumption-related price charged for each kWh, in the currency and billing period you want to model. A monthly payment or fixed service charge is not a unit rate. Keep fixed charges separate for whole-tariff comparisons, and retain any time, tier or tax boundary with the entered price.",
      "topic": "Energy basics",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-14",
      "relatedCalculator": "https://wattandhome.com/calculators/fridge-running-cost/",
      "sources": [
        {
          "id": "ofgem-bill",
          "name": "Ofgem: How an energy bill is calculated",
          "url": "https://www.ofgem.gov.uk/your-energy-supply/your-energy-bill/how-your-electricity-or-gas-bill-calculated",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "pseg-bill-charges",
          "name": "PSE&G bill FAQ: electricity supply, delivery and kWh usage",
          "url": "https://nj.myaccount.pseg.com/faq",
          "region": "US",
          "checkedOn": "2026-10-02"
        }
      ]
    },
    {
      "id": "pence-cents-to-kwh-rate",
      "canonical": "https://wattandhome.com/guides/pence-cents-to-kwh-rate/",
      "title": "Pence, cents and price per kWh: avoiding a 100-fold error",
      "question": "How do I convert pence or cents per kWh into the calculator price input?",
      "shortAnswer": "Divide pence or cents per kWh by 100 to enter pounds, dollars or euros per kWh. For example, 20 US cents/kWh becomes 0.20 USD/kWh. This changes the currency unit, not the energy unit or exchange rate; selecting a currency does not convert an existing price.",
      "topic": "Energy basics",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/washing-machine-running-cost/",
      "sources": [
        {
          "id": "ofgem-bill",
          "name": "Ofgem: How an energy bill is calculated",
          "url": "https://www.ofgem.gov.uk/your-energy-supply/your-energy-bill/how-your-electricity-or-gas-bill-calculated",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "measure-appliance-electricity",
      "canonical": "https://wattandhome.com/guides/measure-appliance-electricity/",
      "title": "How to measure appliance electricity use in kWh",
      "question": "How can I measure appliance kWh and turn a short sample into an annual estimate?",
      "shortAnswer": "Record accumulated kWh at the start and end of complete cycles or representative complete days, then subtract the readings. Retain the model, programme, load, settings and conditions. A sample reports observed energy; applying it to an annual routine is a separately stated projection, not an annual measurement.",
      "topic": "Energy basics",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-14",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "doe-energy-guide",
          "name": "US Department of Energy: Energy Savers guide",
          "url": "https://www.energy.gov/sites/prod/files/2013/06/f2/energy_savers.pdf",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "doe-standby-measurement",
          "name": "US Department of Energy: Measuring standby power",
          "url": "https://www.energy.gov/cmei/femp/measuring-standby-power",
          "region": "US",
          "checkedOn": "2026-10-14"
        }
      ]
    },
    {
      "id": "time-of-use-appliance-cost",
      "canonical": "https://wattandhome.com/guides/time-of-use-appliance-cost/",
      "title": "Time-of-use appliance costs: energy shares and tariff break-even",
      "question": "How do I calculate appliance cost when electricity has peak and off-peak rates?",
      "shortAnswer": "Multiply the kWh used in each tariff window by that window’s price, then add the costs. Off-peak share describes energy rather than elapsed hours. For complete tariff comparisons, use whole-household energy and add fixed charges once; a two-period scenario does not reproduce tiers, demand or complex seasonal billing.",
      "topic": "Energy basics",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/time-of-use-tariff-comparison/",
      "sources": [
        {
          "id": "ofgem-bill",
          "name": "Ofgem: How an energy bill is calculated",
          "url": "https://www.ofgem.gov.uk/your-energy-supply/your-energy-bill/how-your-electricity-or-gas-bill-calculated",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "est-time-tariffs",
          "name": "Energy Saving Trust: Time-of-use tariffs",
          "url": "https://energysavingtrust.org.uk/should-i-switch-to-a-time-of-use-tariff/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "pge-tou-windows",
          "name": "PG&E: Residential time-of-use windows and seasonal/baseline conditions",
          "url": "https://www.pge.com/en/account/rate-plans/time-of-use-rate-plans.html",
          "region": "US",
          "checkedOn": "2026-10-03"
        }
      ]
    },
    {
      "id": "fridge-cost-per-day",
      "canonical": "https://wattandhome.com/guides/fridge-cost-per-day/",
      "title": "How much does a fridge cost per day or per month?",
      "question": "How do I calculate fridge electricity cost per day and per month?",
      "shortAnswer": "Multiply a fridge’s compatible annual kWh by your electricity price for annual cost. Divide that cost by 365 for a daily annual average or by 12 for a monthly average. These averages do not predict each day or month; a representative measured sample is a separate estimate with its own conditions.",
      "topic": "Fridges & freezers",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/fridge-running-cost/",
      "sources": [
        {
          "id": "eu-fridge-label",
          "name": "European Commission: Fridge and freezer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/fridges-and-freezers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "replace-old-fridge-energy-savings",
      "canonical": "https://wattandhome.com/guides/replace-old-fridge-energy-savings/",
      "title": "Replacing an old fridge: estimate savings against keeping it",
      "question": "Will replacing my old working fridge save enough electricity to pay for a new one?",
      "shortAnswer": "Compare keeping a working fridge with the full net replacement outlay and future electricity. Annual savings equal the compatible old-minus-new annual kWh multiplied by your tariff. Divide the net outlay by positive annual savings for simple payback, then check the chosen period’s totals separately.",
      "topic": "Fridges & freezers",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/replacement-payback/",
      "sources": [
        {
          "id": "energy-star-replacement",
          "name": "ENERGY STAR: Flip Your Fridge calculator and assumptions",
          "url": "https://www.energystar.gov/products/refrigerators/flip-your-fridge",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-recycling",
          "name": "ENERGY STAR: Fridge and freezer recycling routes",
          "url": "https://www.energystar.gov/products/recycle/find_fridge_freezer_recycling_program",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-wrt549-record",
          "name": "ENERGY STAR: Whirlpool WRT549SZD*, registry ID 2218984",
          "url": "https://www.energystar.gov/productfinder/product/certified-residential-refrigerators/details/2218984/export/pdf",
          "region": "US",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "energy-star-gte19-record",
          "name": "ENERGY STAR GE GTE19JSN**** registry 2350114, export captured 14 October 2026",
          "url": "https://www.energystar.gov/productfinder/product/certified-residential-refrigerators/details/2350114/export/pdf",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "fridge-freezer-size-comparison",
      "canonical": "https://wattandhome.com/guides/fridge-freezer-size-comparison/",
      "title": "Fridge and freezer sizes: compare storage and running costs",
      "question": "How do I compare fridge-freezer capacity and energy cost between different sizes?",
      "shortAnswer": "Choose the chilled and frozen storage capacity your household needs before comparing energy. Price each suitable solution’s compatible annual kWh at the same tariff, including additional units if needed. A smaller appliance or better class letter alone does not establish the best cost for the same storage task.",
      "topic": "Fridges & freezers",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/appliance-comparison/",
      "sources": [
        {
          "id": "eu-fridge-label",
          "name": "European Commission: Fridge and freezer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/fridges-and-freezers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "est-appliances",
          "name": "Energy Saving Trust: Home appliances and energy ratings",
          "url": "https://energysavingtrust.org.uk/advice/home-appliances/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "washing-machine-cost-per-load",
      "canonical": "https://wattandhome.com/guides/washing-machine-cost-per-load/",
      "title": "Washing-machine electricity cost per load",
      "question": "How much does one washing-machine load cost in electricity?",
      "shortAnswer": "Multiply a compatible programme’s kWh per cycle by your electricity price for cost per load. A per-100-cycle label needs division by 100 first. Weighted eco figures do not describe every programme or full load; keep associated water heating, water, detergent and any drying stage on their stated boundaries.",
      "topic": "Laundry",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/washing-machine-running-cost/",
      "sources": [
        {
          "id": "eu-washing-label",
          "name": "European Commission: Washing-machine energy labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/washing-machines_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "us-washer-label",
          "name": "ENERGY STAR: Clothes-washer energy metrics",
          "url": "https://www.energystar.gov/products/clothes_washers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-wgg244zc-fiche",
          "name": "Bosch WGG244ZCGB product information sheet, dated 27 August 2026",
          "url": "https://media3.bosch-home.com/Documents/eudatasheet/en-GB/WGG244ZCGB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-wgg244zc-listing",
          "name": "Bosch UK WGG244ZCGB manufacturer listing",
          "url": "https://www.bosch-home.co.uk/en/product/laundry/washing-machines/front-load-washing-machines/WGG244ZCGB",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-wan28258-fiche",
          "name": "Bosch: WAN28258GB product information sheet, dated 28 November 2025",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WAN28258GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-wan28258-label",
          "name": "Bosch: WAN28258GB energy label, 46 kWh per 100 cycles",
          "url": "https://media3.bsh-group.com/Documents/energylabel/en-GB/WAN28258GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "eco-programmes-time-and-energy",
      "canonical": "https://wattandhome.com/guides/eco-programmes-time-and-energy/",
      "title": "Why eco programmes take longer but can use less electricity",
      "question": "Does a longer eco washing or dishwasher programme use more electricity?",
      "shortAnswer": "Programme duration alone does not determine electricity use. Energy depends on the power drawn across all stages, so a longer eco cycle can use less electricity than a shorter programme. Price the compatible complete-cycle kWh rather than multiplying the whole duration by a nameplate wattage.",
      "topic": "Laundry",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-14",
      "relatedCalculator": "https://wattandhome.com/calculators/washing-machine-running-cost/",
      "sources": [
        {
          "id": "eu-washing-label",
          "name": "European Commission: Washing-machine energy labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/washing-machines_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-dishwasher-label",
          "name": "European Commission: Dishwasher labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/dishwashers_en",
          "region": "EU",
          "checkedOn": "2026-10-02"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-smd6ycx01-fiche",
          "name": "Bosch SMD6YCX01G product information sheet: eco cycle energy and duration",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/SMD6YCX01G.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        }
      ]
    },
    {
      "id": "heat-pump-dryer-running-cost",
      "canonical": "https://wattandhome.com/guides/heat-pump-dryer-running-cost/",
      "title": "Heat-pump dryer running costs and purchase-price payback",
      "question": "How do heat-pump dryer electricity savings compare with a higher purchase price?",
      "shortAnswer": "Use the exact dryer’s declared cycle energy or a compatible measurement, then multiply by your tariff and routine. Compare the purchase premium with annual electricity savings. Two efficient heat-pump models can differ only slightly in energy, leaving a higher price unrecovered over the chosen period.",
      "topic": "Laundry",
      "region": "UK",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/appliance-comparison/",
      "sources": [
        {
          "id": "eu-dryer-label",
          "name": "European Commission: Tumble-dryer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/tumble-dryers_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "uk-dryer-transition",
          "name": "GOV.UK: Great Britain tumble-dryer label transition",
          "url": "https://www.gov.uk/government/consultations/raising-product-standards-for-household-tumble-dryers/outcome/raising-standards-for-household-tumble-dryers-government-response-accessible-webpage",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "bosch-wqh246dr-fiche",
          "name": "Bosch WQH246DRGB eco-cycle information sheet, dated 22 September 2026",
          "url": "https://media3.bosch-home.com/Documents/eudatasheet/en-GB/WQH246DRGB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-wrb247c9-fiche",
          "name": "Bosch WRB247C9GB eco-cycle information sheet, dated 22 September 2026",
          "url": "https://media3.bosch-home.com/Documents/eudatasheet/en-GB/WRB247C9GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-uk-dryer-listing",
          "name": "Bosch UK dryer listings: dated price and availability snapshot",
          "url": "https://www.bosch-home.co.uk/en/category/laundry/tumble-dryers",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-wth85223-fiche",
          "name": "Bosch: WTH85223GB dryer fiche, dated 2 July 2026",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WTH85223GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-wtn83203-fiche",
          "name": "Bosch: WTN83203GB dryer fiche, dated 6 September 2026",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WTN83203GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-wth85223-spec",
          "name": "Bosch: WTH85223GB heat-pump dryer specification sheet",
          "url": "https://media3.bsh-group.com/Documents/specsheet/en-GB/WTH85223GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "dishwasher-cost-per-cycle",
      "canonical": "https://wattandhome.com/guides/dishwasher-cost-per-cycle/",
      "title": "Dishwasher electricity cost per cycle and per year",
      "question": "How much does a dishwasher cycle cost and how do I estimate annual use?",
      "shortAnswer": "A stated dishwasher cycle costs its kWh per cycle multiplied by your electricity price. Divide a per-100-cycle label by 100 first. The documented 0.543 kWh eco-cycle example costs £0.15204 at an illustrative £0.28/kWh. Water, detergent and other programmes need separate inputs.",
      "topic": "Dishwashers",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/dishwasher-running-cost/",
      "sources": [
        {
          "id": "eu-dishwasher-label",
          "name": "European Commission: Dishwasher labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/dishwashers_en",
          "region": "EU",
          "checkedOn": "2026-10-02"
        },
        {
          "id": "us-dishwasher-label",
          "name": "ENERGY STAR: Dishwasher energy metrics",
          "url": "https://www.energystar.gov/products/dishwashers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-smd6ycx01-fiche",
          "name": "Bosch SMD6YCX01G product information sheet: eco cycle energy and duration",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/SMD6YCX01G.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-smd6ycx01-label",
          "name": "Bosch SMD6YCX01G energy label: kWh per 100 cycles, capacity and water",
          "url": "https://media3.bsh-group.com/Documents/energylabel/en-GB/SMD6YCX01G.pdf",
          "region": "UK",
          "checkedOn": "2026-10-02"
        }
      ]
    },
    {
      "id": "compare-appliance-running-costs",
      "canonical": "https://wattandhome.com/guides/compare-appliance-running-costs/",
      "title": "Comparing two appliances on compatible electricity inputs",
      "question": "How do I compare running costs when appliance energy figures use different units?",
      "shortAnswer": "Match capacity, task, programme and energy boundary before comparing costs. Use annual kWh directly; divide per-100-cycle energy by 100 before multiplying by weekly cycles and 52 weeks. Multiply compatible annual quantities by the same tariff. Converting units does not make different tests equivalent.",
      "topic": "Buying decisions",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-14",
      "relatedCalculator": "https://wattandhome.com/calculators/appliance-comparison/",
      "sources": [
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-eprel",
          "name": "European Commission: EPREL for consumers",
          "url": "https://energy-efficient-products.ec.europa.eu/consumers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "replacement-payback-explained",
      "canonical": "https://wattandhome.com/guides/replacement-payback-explained/",
      "title": "Replacement payback: what the calculation means and leaves out",
      "question": "How do I calculate appliance replacement payback and handle zero or negative savings?",
      "shortAnswer": "Simple replacement payback is net upfront replacement cost divided by positive annual electricity savings. Net cost includes purchase, installation and disposal less confirmed credits; the old purchase price is already paid. Zero upfront cost and zero or negative savings are separate outcomes, not ordinary payback periods.",
      "topic": "Buying decisions",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/replacement-payback/",
      "sources": [
        {
          "id": "energy-star-replacement",
          "name": "ENERGY STAR: Flip Your Fridge calculator and assumptions",
          "url": "https://www.energystar.gov/products/refrigerators/flip-your-fridge",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-recycling",
          "name": "ENERGY STAR: Fridge and freezer recycling routes",
          "url": "https://www.energystar.gov/products/recycle/find_fridge_freezer_recycling_program",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "appliance-total-cost-of-ownership",
      "canonical": "https://wattandhome.com/guides/appliance-total-cost-of-ownership/",
      "title": "Appliance purchase price and electricity cost over time",
      "question": "How do I compare appliance purchase price and electricity over five or ten years?",
      "shortAnswer": "For two suitable new appliances, compare purchase price plus annual electricity cost over the same chosen period. Annual electricity cost is compatible annual kWh multiplied by your tariff. This model excludes unentered costs such as repairs, financing and water; the chosen period is not a lifetime forecast.",
      "topic": "Buying decisions",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/appliance-comparison/",
      "sources": [
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-replacement",
          "name": "ENERGY STAR: Flip Your Fridge calculator and assumptions",
          "url": "https://www.energystar.gov/products/refrigerators/flip-your-fridge",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "calculate-electricity-cost-watts-hours",
      "canonical": "https://wattandhome.com/guides/calculate-electricity-cost-watts-hours/",
      "title": "How to calculate electricity cost from watts and hours",
      "question": "How do I calculate appliance electricity cost from watts and hours?",
      "shortAnswer": "Electricity cost equals electrical input watts ÷ 1,000 × hours of use × your price per kWh. For several comparable use days, multiply by that day count. The formula assumes the entered power is drawn throughout the time; accumulated kWh is a better input when the draw varies or cycles.",
      "topic": "Energy basics",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "which-appliances-use-most-electricity",
      "canonical": "https://wattandhome.com/guides/which-appliances-use-most-electricity/",
      "title": "Which appliances add most to your electricity bill?",
      "question": "Which appliances use the most electricity in my own household?",
      "shortAnswer": "Rank the appliances by kWh over the same period, then apply the relevant tariff. High watts alone do not identify the largest bill contributor: a brief powerful task can use less energy than a smaller draw repeated for many hours. Keep household-planner rows non-overlapping and include each appliance’s routine.",
      "topic": "Energy basics",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-14",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "1500w-heater-running-cost",
      "canonical": "https://wattandhome.com/guides/1500w-heater-running-cost/",
      "title": "How much does a 1500 W electric heater cost to run?",
      "question": "What does a 1500 watt electric heater cost per hour and per day?",
      "shortAnswer": "A heater drawing 1,500 W continuously uses 1.5 kWh per hour. Multiply 1.5 by your electricity price per kWh for the hourly cost, then by the hours actually used. Thermostat cycling can reduce consumption, so a full-power calculation is a scenario rather than a measured daily bill.",
      "topic": "Heating",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electric-heater-running-cost/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "est-electric-heating",
          "name": "Energy Saving Trust: Direct and secondary electric heating",
          "url": "https://energysavingtrust.org.uk/advice/electric-heating/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "probreeze-heater-types",
          "name": "Pro Breeze: Fan heaters, oil-filled radiators and thermostats",
          "url": "https://probreeze.com/blogs/news/what-portable-electric-heater-to-buy-fan-heaters-vs-oil-filled-radiators-vs-convector-heaters",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "oil-filled-radiator-vs-fan-heater-cost",
      "canonical": "https://wattandhome.com/guides/oil-filled-radiator-vs-fan-heater-cost/",
      "title": "Oil-filled radiator vs fan heater: which costs less to run?",
      "question": "Is an oil-filled radiator cheaper to run than a fan heater?",
      "shortAnswer": "At equal continuous electrical input, operating time and tariff, an oil-filled radiator and a fan heater have the same electricity cost. Different controls, cycling or required use time can change the total. Compare the heating task and actual energy rather than assuming the appliance shape creates a saving.",
      "topic": "Heating",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-14",
      "relatedCalculator": "https://wattandhome.com/calculators/electric-heater-running-cost/",
      "sources": [
        {
          "id": "probreeze-heater-types",
          "name": "Pro Breeze: Fan heaters, oil-filled radiators and thermostats",
          "url": "https://probreeze.com/blogs/news/what-portable-electric-heater-to-buy-fan-heaters-vs-oil-filled-radiators-vs-convector-heaters",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "est-electric-heating",
          "name": "Energy Saving Trust: Direct and secondary electric heating",
          "url": "https://energysavingtrust.org.uk/advice/electric-heating/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "dehumidifier-cost-24-hours",
      "canonical": "https://wattandhome.com/guides/dehumidifier-cost-24-hours/",
      "title": "How much does a dehumidifier cost to run for 24 hours?",
      "question": "How much does running a dehumidifier for 24 hours cost?",
      "shortAnswer": "For an uninterrupted constant draw, a dehumidifier’s 24-hour cost is input watts ÷ 1,000 × 24 × your tariff. Being enabled for 24 hours does not prove it draws full power all day. A complete-day kWh measurement includes the cycling captured in that sample and should not be reduced again.",
      "topic": "Humidity",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/dehumidifier-running-cost/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-dehumidifiers",
          "name": "ENERGY STAR: Dehumidifier efficiency and operating conditions",
          "url": "https://www.energystar.gov/products/dehumidifiers",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "compressor-vs-desiccant-dehumidifier-cost",
      "canonical": "https://wattandhome.com/guides/compressor-vs-desiccant-dehumidifier-cost/",
      "title": "Compressor vs desiccant dehumidifiers: compare running costs",
      "question": "Is a compressor or desiccant dehumidifier cheaper to run in my room?",
      "shortAnswer": "Compare suitable models removing moisture under comparable room conditions. Input kW × operating hours × tariff prices the electricity, but watts alone do not establish how much water is removed. Check each model’s temperature range and use measured energy for the task when available.",
      "topic": "Humidity",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/dehumidifier-running-cost/",
      "sources": [
        {
          "id": "energy-star-dehumidifiers",
          "name": "ENERGY STAR: Dehumidifier efficiency and operating conditions",
          "url": "https://www.energystar.gov/products/dehumidifiers",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "meaco-dehumidifier-types",
          "name": "Meaco: Compressor and desiccant operating conditions",
          "url": "https://blog.meaco.com/when-to-buy-a-desiccant-dehumidifier-and-when-to-buy-a-compressor-dehumidifier/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "portable-window-air-conditioner-cost",
      "canonical": "https://wattandhome.com/guides/portable-window-air-conditioner-cost/",
      "title": "Portable and window AC running costs: per hour and month",
      "question": "How much does a portable or window air conditioner cost per hour and per month?",
      "shortAnswer": "At a stated constant electrical input, AC hourly cost is input kW multiplied by your price per kWh. Multiply by actual use hours and chosen use days for a period estimate. BTU/h capacity is not electrical input, and thermostat cycling or a seasonal annual label requires an appropriately different basis.",
      "topic": "Cooling",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/air-conditioner-running-cost/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-room-ac",
          "name": "ENERGY STAR: Room air-conditioner metrics and operation",
          "url": "https://www.energystar.gov/products/room_air_conditioners/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-aircon-label",
          "name": "European Commission: Air-conditioner labels and comfort fans",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/air-conditioners-and-comfort-fans_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "standby-electricity-cost",
      "canonical": "https://wattandhome.com/guides/standby-electricity-cost/",
      "title": "Standby electricity cost: calculate your devices and savings",
      "question": "How much does standby electricity cost and which devices are worth measuring?",
      "shortAnswer": "Standby cost is average watts ÷ 1,000 × hours in that mode × days × your price per kWh. At an illustrative £0.28/kWh, a constant 5 W for 20 hours daily costs £10.22 across 365 days. Measure the actual mode and count only its hours; a device's maximum rating does not establish standby draw.",
      "topic": "Electronics",
      "region": "general",
      "additionalRegions": [
        "US",
        "UK",
        "EU"
      ],
      "editoriallyUpdatedOn": "2026-10-14",
      "relatedCalculator": "https://wattandhome.com/calculators/standby-running-cost/",
      "sources": [
        {
          "id": "doe-standby-measurement",
          "name": "US Department of Energy: Measuring standby power",
          "url": "https://www.energy.gov/cmei/femp/measuring-standby-power",
          "region": "US",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "eu-standby-modes",
          "name": "European Commission: Standby, networked standby and off mode",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/standby-networked-standby-and-mode_en",
          "region": "EU",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "energy-star-tv-criteria",
          "name": "ENERGY STAR: Television on-mode and standby criteria",
          "url": "https://www.energystar.gov/products/televisions/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "bt-digital-voice-power",
          "name": "BT: Digital Voice dependence on hub power",
          "url": "https://www.bt.com/help/home-phone/digital-voice/will-my-digital-voice-service-work-in-a-power-cut",
          "region": "UK",
          "checkedOn": "2026-10-14"
        }
      ]
    },
    {
      "id": "fan-vs-air-conditioner-running-cost",
      "canonical": "https://wattandhome.com/guides/fan-vs-air-conditioner-running-cost/",
      "title": "Fan vs air conditioner: running cost and what each does",
      "question": "How much cheaper is a fan to run than an air conditioner and do they do the same job?",
      "shortAnswer": "For a constant input, hourly cost equals input kW multiplied by your tariff. A fan provides airflow, while an air conditioner transfers heat; their running costs do not measure the same cooling result. Compare suitable operation and use measured energy when cycling makes rated watts unrepresentative.",
      "topic": "Cooling",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/air-conditioner-running-cost/",
      "sources": [
        {
          "id": "eu-aircon-label",
          "name": "European Commission: Air-conditioner labels and comfort fans",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/air-conditioners-and-comfort-fans_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-room-ac",
          "name": "ENERGY STAR: Room air-conditioner metrics and operation",
          "url": "https://www.energystar.gov/products/room_air_conditioners/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "router-modem-running-cost",
      "canonical": "https://wattandhome.com/guides/router-modem-running-cost/",
      "title": "Router and modem running cost: watts, mesh nodes and kWh",
      "question": "How much electricity do a Wi-Fi router, modem and mesh network use?",
      "shortAnswer": "For equipment running continuously, divide its average wall-input watts by 1,000 and multiply by 24 hours, days and your tariff. Include a separate modem, fibre terminal and mesh nodes if they are outside the reading. Adapter output capacity and declared idle test power are not measurements of your complete network.",
      "topic": "Electronics",
      "region": "general",
      "additionalRegions": [
        "US",
        "UK",
        "EU"
      ],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/standby-running-cost/",
      "sources": [
        {
          "id": "tp-link-router-idle-2024",
          "name": "TP-Link: 2024 US small-network-equipment idle power disclosure",
          "url": "https://www.tp-link.com/us/landing/tp-link-sne-energy-information-2024/",
          "region": "US",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "bt-digital-voice-power",
          "name": "BT: Digital Voice dependence on hub power",
          "url": "https://www.bt.com/help/home-phone/digital-voice/will-my-digital-voice-service-work-in-a-power-cut",
          "region": "UK",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "doe-standby-measurement",
          "name": "US Department of Energy: Measuring standby power",
          "url": "https://www.energy.gov/cmei/femp/measuring-standby-power",
          "region": "US",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "eu-standby-modes",
          "name": "European Commission: Standby, networked standby and off mode",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/standby-networked-standby-and-mode_en",
          "region": "EU",
          "checkedOn": "2026-10-14"
        }
      ]
    },
    {
      "id": "btu-vs-watts-air-conditioner",
      "canonical": "https://wattandhome.com/guides/btu-vs-watts-air-conditioner/",
      "title": "BTU/h vs watts: which AC figure belongs in a cost calculator?",
      "question": "Can I convert an air conditioner’s BTU rating directly into electricity running cost?",
      "shortAnswer": "BTU/h describes cooling capacity, while input watts describe electricity use. For a power-and-time cost estimate, use electrical input kW × hours × your electricity price per kWh. Cooling capacity alone cannot supply a reliable input because efficiency and operating conditions also matter.",
      "topic": "Cooling",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/air-conditioner-running-cost/",
      "sources": [
        {
          "id": "energy-star-room-ac",
          "name": "ENERGY STAR: Room air-conditioner metrics and operation",
          "url": "https://www.energystar.gov/products/room_air_conditioners/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-aircon-label",
          "name": "European Commission: Air-conditioner labels and comfort fans",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/air-conditioners-and-comfort-fans_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "tv-active-standby-running-cost",
      "canonical": "https://wattandhome.com/guides/tv-active-standby-running-cost/",
      "title": "TV electricity cost: active viewing, HDR and standby",
      "question": "How much does a television cost to run while watching and in standby?",
      "shortAnswer": "Calculate active viewing and standby separately, using each mode's energy and hours. A display label's kWh per 1,000 hours prices its stated viewing test, not an entire household year. Add standby only for hours outside active use, and keep soundbars, consoles and streaming boxes outside or inside the boundary consistently.",
      "topic": "Electronics",
      "region": "general",
      "additionalRegions": [
        "US",
        "UK",
        "EU"
      ],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "eu-electronic-displays",
          "name": "European Commission: Electronic display labels and operating modes",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/electronic-displays_en",
          "region": "EU",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "energy-star-tv-criteria",
          "name": "ENERGY STAR: Television on-mode and standby criteria",
          "url": "https://www.energystar.gov/products/televisions/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "uk-energy-labels",
          "name": "GOV.UK: Energy labelling in Great Britain and Northern Ireland",
          "url": "https://www.gov.uk/guidance/the-energy-labelling-of-products",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "doe-standby-measurement",
          "name": "US Department of Energy: Measuring standby power",
          "url": "https://www.energy.gov/cmei/femp/measuring-standby-power",
          "region": "US",
          "checkedOn": "2026-10-14"
        }
      ]
    },
    {
      "id": "game-console-running-cost",
      "canonical": "https://wattandhome.com/guides/game-console-running-cost/",
      "title": "Game console electricity cost: gaming, rest and shutdown",
      "question": "How much does a game console cost to run in gaming and rest mode?",
      "shortAnswer": "Add the energy used in gaming, other active tasks and each low-power mode across non-overlapping hours. Console model and settings matter: rest mode can maintain downloads or charge accessories. Use the manufacturer's matching declaration or your own measurement, then multiply total kWh by your tariff.",
      "topic": "Electronics",
      "region": "general",
      "additionalRegions": [
        "US",
        "UK",
        "EU"
      ],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "playstation-power-settings",
          "name": "PlayStation: Power-saving settings and rest-mode features",
          "url": "https://www.playstation.com/en-gb/support/hardware/power-saving/",
          "region": "general",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "playstation-energy-measurements",
          "name": "PlayStation: Model-specific energy-efficiency disclosures",
          "url": "https://www.playstation.com/en-gb/legal/ecodesign/",
          "region": "UK",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "xbox-energy-options",
          "name": "Xbox Wire: Shutdown, Sleep and active-hours power options, April 2023",
          "url": "https://news.xbox.com/en-us/2023/04/12/xbox-april-2023-update-available-today/",
          "region": "general",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "air-conditioner-energy-label",
      "canonical": "https://wattandhome.com/energy-labels/air-conditioner-energy-label/",
      "title": "EU air-conditioner energy labels: SEER, SCOP and kWh",
      "question": "How do I read an EU air-conditioner label and calculate cost from its energy figures?",
      "shortAnswer": "Read the exact AC model’s cooling or heating energy column, climate and consumption unit. SEER, SCOP and cooling capacity are different from a kWh input. Use a compatible stated annual energy figure directly for annual cost; do not rescale that test year by adding household operating hours again.",
      "topic": "Labels",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/air-conditioner-running-cost/",
      "sources": [
        {
          "id": "eu-aircon-label",
          "name": "European Commission: Air-conditioner labels and comfort fans",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/air-conditioners-and-comfort-fans_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-eprel",
          "name": "European Commission: EPREL for consumers",
          "url": "https://energy-efficient-products.ec.europa.eu/consumers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "air-fryer-vs-oven-electricity-cost",
      "canonical": "https://wattandhome.com/guides/air-fryer-vs-oven-electricity-cost/",
      "title": "Air fryer vs electric oven: compare cost for the same meal",
      "question": "Is an air fryer cheaper than an electric oven after including preheating and batches?",
      "shortAnswer": "Compare the energy needed for the same total meal, including all batches and preheating. Multiply each method’s whole-meal kWh by your tariff. A smaller appliance is not automatically cheaper when several batches are needed; a complete-meal measurement can capture cycling that rated watts miss.",
      "topic": "Cooking",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/air-fryer-vs-oven-cost/",
      "sources": [
        {
          "id": "est-cooking",
          "name": "Energy Saving Trust: Air fryer, oven and cooking comparisons",
          "url": "https://energysavingtrust.org.uk/air-fryer-oven-microwave-hob-slow-cooker-cheaper-cooking/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "desktop-computer-electricity-use",
      "canonical": "https://wattandhome.com/guides/desktop-computer-electricity-use/",
      "title": "Desktop computer electricity use: actual draw versus PSU watts",
      "question": "Does a 750 W power supply mean my desktop computer always uses 750 watts?",
      "shortAnswer": "A PSU's wattage rating describes its output capacity, not a constant electricity draw. Price the computer's measured wall-input kWh or a stated average for each workload and power state. Include monitors separately unless a group reading already captures them, and do not add PSU conversion losses to energy already measured at the wall.",
      "topic": "Electronics",
      "region": "general",
      "additionalRegions": [
        "US",
        "UK",
        "EU"
      ],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "corsair-psu-capacity",
          "name": "Corsair: HX1200i declared output capacity and AC/DC efficiency",
          "url": "https://www.corsair.com/us/en/p/psu/cp-9020281-na/hx1200i-fully-modular-ultra-low-noise-platinum-atx-1200-watt-pc-power-supply-cp-9020281-na",
          "region": "US",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "seasonic-psu-sizing",
          "name": "Seasonic: PSU sizing assumptions and real workload power",
          "url": "https://seasonic.com/insights/power-supply-calculator-errors/",
          "region": "general",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "microsoft-pc-power-states",
          "name": "Microsoft Support: Shut down, sleep or hibernate a PC",
          "url": "https://support.microsoft.com/en-us/windows/experience/power-battery/shut-down-sleep-or-hibernate-your-pc",
          "region": "general",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "eia-energy-units",
          "name": "US EIA: Electricity units glossary",
          "url": "https://www.eia.gov/tools/glossary/index.php?id=Electric",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "appliance-estimates-vs-electricity-bill",
      "canonical": "https://wattandhome.com/guides/appliance-estimates-vs-electricity-bill/",
      "title": "Why appliance estimates differ from your electricity bill",
      "question": "Why do my appliance running-cost estimates not add up to my electricity bill?",
      "shortAnswer": "Compare energy in kWh over the same billing period before comparing money. A bill can cover loads missing from your list, while appliance labels and short samples may not describe those exact days. Fixed charges affect the amount paid without adding kWh. A remaining difference is unexplained energy, not proof of a faulty meter or overcharging.",
      "topic": "Energy basics",
      "region": "general",
      "additionalRegions": [
        "US",
        "UK",
        "EU"
      ],
      "editoriallyUpdatedOn": "2026-10-14",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-bill-appliance-check/",
      "sources": [
        {
          "id": "eia-reading-electricity-meter",
          "name": "US EIA: Measuring electricity and utility meters",
          "url": "https://www.eia.gov/energyexplained/electricity/measuring-electricity.php",
          "region": "US",
          "checkedOn": "2026-10-14"
        },
        {
          "id": "ofgem-bill",
          "name": "Ofgem: How an energy bill is calculated",
          "url": "https://www.ofgem.gov.uk/your-energy-supply/your-energy-bill/how-your-electricity-or-gas-bill-calculated",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "pseg-bill-charges",
          "name": "PSE&G bill FAQ: electricity supply, delivery and kWh usage",
          "url": "https://nj.myaccount.pseg.com/faq",
          "region": "US",
          "checkedOn": "2026-10-02"
        },
        {
          "id": "eu-fridge-label",
          "name": "European Commission: Fridge and freezer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/fridges-and-freezers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "microwave-running-cost-input-watts",
      "canonical": "https://wattandhome.com/guides/microwave-running-cost-input-watts/",
      "title": "Microwave running cost: use input watts, not cooking watts",
      "question": "Which microwave wattage should I use to calculate electricity running cost?",
      "shortAnswer": "Use a microwave’s electrical input or power-consumption rating for a watts-and-time estimate, rather than its advertised cooking-output watts. Multiply input kW by compatible operating hours and your tariff. Output power describes the cooking task and can be lower than the appliance’s electrical consumption.",
      "topic": "Cooking",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "panasonic-microwave-input",
          "name": "Panasonic: NN-SD765S electrical consumption and cooking power",
          "url": "https://help.na.panasonic.com/answers/features-and-specifications-microwave-oven-nn-sd765s/",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "est-cooking",
          "name": "Energy Saving Trust: Air fryer, oven and cooking comparisons",
          "url": "https://energysavingtrust.org.uk/air-fryer-oven-microwave-hob-slow-cooker-cheaper-cooking/",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "us-appliance-running-costs",
      "canonical": "https://wattandhome.com/guides/us-appliance-running-costs/",
      "title": "US appliance running costs: from EnergyGuide to a household decision",
      "question": "How do I calculate US appliance running costs using EnergyGuide and my electricity bill?",
      "shortAnswer": "Use the exact US model’s compatible annual kWh and your electricity price in dollars per kWh, rather than treating the EnergyGuide dollar estimate as your bill. Check associated water-heating scope for laundry and dishwashers. Keep fixed charges separate and use household energy for complete tariff comparisons.",
      "topic": "Energy basics",
      "region": "US",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/energy-label-reader/",
      "sources": [
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "us-washer-label",
          "name": "ENERGY STAR: Clothes-washer energy metrics",
          "url": "https://www.energystar.gov/products/clothes_washers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "us-dishwasher-label",
          "name": "ENERGY STAR: Dishwasher energy metrics",
          "url": "https://www.energystar.gov/products/dishwashers/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "energy-star-wrt549-record",
          "name": "ENERGY STAR: Whirlpool WRT549SZD*, registry ID 2218984",
          "url": "https://www.energystar.gov/productfinder/product/certified-residential-refrigerators/details/2218984/export/pdf",
          "region": "US",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "energy-star-gte19-record",
          "name": "ENERGY STAR GE GTE19JSN**** registry 2350114, export captured 14 October 2026",
          "url": "https://www.energystar.gov/productfinder/product/certified-residential-refrigerators/details/2350114/export/pdf",
          "region": "US",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "pge-tou-windows",
          "name": "PG&E: Residential time-of-use windows and seasonal/baseline conditions",
          "url": "https://www.pge.com/en/account/rate-plans/time-of-use-rate-plans.html",
          "region": "US",
          "checkedOn": "2026-10-03"
        }
      ]
    },
    {
      "id": "uk-eu-appliance-running-costs",
      "canonical": "https://wattandhome.com/guides/uk-eu-appliance-running-costs/",
      "title": "UK and EU appliance running costs: label, programme and tariff",
      "question": "How do I calculate UK and EU appliance costs from annual or per-100-cycle labels?",
      "shortAnswer": "Identify whether your label applies to Great Britain, Northern Ireland or an EU market, and retain its unit and programme. Price annual kWh directly or divide per-100-cycle energy before applying your routine. Enter your own consumption-related tariff in the chosen currency; neither a label class nor a currency switch supplies a household price.",
      "topic": "Energy basics",
      "region": "EU",
      "additionalRegions": [
        "UK"
      ],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/energy-label-reader/",
      "sources": [
        {
          "id": "eu-washing-label",
          "name": "European Commission: Washing-machine energy labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/washing-machines_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-dryer-label",
          "name": "European Commission: Tumble-dryer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/tumble-dryers_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "eu-eprel",
          "name": "European Commission: EPREL for consumers",
          "url": "https://energy-efficient-products.ec.europa.eu/consumers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "uk-energy-labels",
          "name": "GOV.UK: Energy labelling in Great Britain and Northern Ireland",
          "url": "https://www.gov.uk/guidance/the-energy-labelling-of-products",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "uk-dryer-transition",
          "name": "GOV.UK: Great Britain tumble-dryer label transition",
          "url": "https://www.gov.uk/government/consultations/raising-product-standards-for-household-tumble-dryers/outcome/raising-standards-for-household-tumble-dryers-government-response-accessible-webpage",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "ofgem-bill",
          "name": "Ofgem: How an energy bill is calculated",
          "url": "https://www.ofgem.gov.uk/your-energy-supply/your-energy-bill/how-your-electricity-or-gas-bill-calculated",
          "region": "UK",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-wan28258-label",
          "name": "Bosch: WAN28258GB energy label, 46 kWh per 100 cycles",
          "url": "https://media3.bsh-group.com/Documents/energylabel/en-GB/WAN28258GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "eu-appliance-running-costs",
      "canonical": "https://wattandhome.com/guides/eu-appliance-running-costs/",
      "title": "EU appliance running costs: energy labels, tariffs and buying costs",
      "question": "How do I turn an EU energy label into running costs and a purchase comparison?",
      "shortAnswer": "Find the exact EU model’s energy quantity, unit and programme, then apply your own tariff and routine. Price annual kWh directly or normalize compatible cycle figures. EPREL can help compare declared product information; electricity savings, purchase quotes and payback still need your household’s inputs.",
      "topic": "Energy basics",
      "region": "EU",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/energy-label-reader/",
      "sources": [
        {
          "id": "eu-eprel",
          "name": "European Commission: EPREL for consumers",
          "url": "https://energy-efficient-products.ec.europa.eu/consumers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-label-explained",
          "name": "European Commission: Understanding the energy label",
          "url": "https://energy-efficient-products.ec.europa.eu/ecodesign-and-energy-label/understanding-energy-label_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-dryer-label",
          "name": "European Commission: Tumble-dryer labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/tumble-dryers_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "eprel-model-comparison",
          "name": "European Commission: EPREL model comparison introduced 20 July 2026",
          "url": "https://energy-efficient-products.ec.europa.eu/news/new-eprel-comparison-tool-support-sustainable-purchasing-2026-07-20_en",
          "region": "EU",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-wqg241001-fiche",
          "name": "Bosch WQG241001 EU eco-cycle information sheet, dated 21 September 2026",
          "url": "https://media3.bosch-home.com/Documents/eudatasheet/de-DE/WQG241001.pdf",
          "region": "EU",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-wrb247c40-fiche",
          "name": "Bosch WRB247C40 EU eco-cycle information sheet, dated 21 September 2026",
          "url": "https://media3.bosch-home.com/Documents/eudatasheet/de-DE/WRB247C40.pdf",
          "region": "EU",
          "checkedOn": "2026-10-03"
        }
      ]
    },
    {
      "id": "measured-dryer-running-cost-case-study",
      "canonical": "https://wattandhome.com/guides/measured-dryer-running-cost-case-study/",
      "title": "Measured dryer costs: a US household case study",
      "question": "What do actual household dryer measurements mean for running costs and replacement payback?",
      "shortAnswer": "A 2021 Minnesota field study reports 2.54 kWh per laundry load for Site 9’s existing dryer and 2.05 kWh for its hybrid heat-pump replacement. Using those rounded measured averages with an assumed three loads/week and $0.20/kWh gives $15.29/year in projected electricity savings. The measurements belong to the study’s researchers; the tariff, routine and costs are Watt & Home scenarios.",
      "topic": "Laundry",
      "region": "US",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-03",
      "relatedCalculator": "https://wattandhome.com/calculators/tumble-dryer-running-cost/",
      "sources": [
        {
          "id": "minnesota-dryer-field-study-2021",
          "name": "Slipstream, CEE and Evergreen Economics: Minnesota dryer field study, July 2021; Table 6 and Appendix B",
          "url": "https://www.mncee.org/sites/default/files/report-files/Field%20and%20Market%20Assesment%20of%20Heat%20Pump%20Clothes%20Dryers.pdf",
          "region": "US",
          "checkedOn": "2026-10-03"
        }
      ]
    },
    {
      "id": "led-lighting-running-cost-and-payback",
      "canonical": "https://wattandhome.com/guides/led-lighting-running-cost-and-payback/",
      "title": "LED lighting costs and replacement payback",
      "question": "Calculate bulb electricity use, compare similar light output and check whether replacement savings cover the actual upfront cost.",
      "shortAnswer": "Lighting energy is input watts divided by 1,000, multiplied by bulb count, operating hours and use days. Compare similar lumens before estimating LED savings. Replacement payback divides the new purchase and installation cost by positive annual electricity savings; it does not predict bulb life.",
      "topic": "Lighting",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/lighting-cost-and-led-payback/",
      "sources": [
        {
          "id": "est-lighting",
          "name": "Energy Saving Trust: light output, compatibility and energy-saving lighting",
          "url": "https://energysavingtrust.org.uk/advice/lighting/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "eu-light-sources",
          "name": "European Commission: light-source labels and electrical energy units",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/light-sources_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "electric-blanket-running-cost",
      "canonical": "https://wattandhome.com/guides/electric-blanket-running-cost/",
      "title": "Electric blanket cost: preheat and lower settings",
      "question": "Estimate electric blanket consumption from separate settings or a complete measured routine, with seasonal days and clear comfort limits.",
      "shortAnswer": "Price an electric blanket using average input watts at each setting and its actual hours, or measured kWh across complete use days. Separate preheating from lower settings. The cost describes heated bedding on that routine; it does not establish equivalent comfort or savings against heating a room.",
      "topic": "Heating",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electric-blanket-running-cost/",
      "sources": [
        {
          "id": "esf-blankets",
          "name": "Electrical Safety First: electric blanket use, condition and manufacturer instructions",
          "url": "https://www.electricalsafetyfirst.org.uk/press-and-media/concerns-as-electric-blanket-fires-hit-five-year-high/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "electric-shower-cost-per-shower",
      "canonical": "https://wattandhome.com/guides/electric-shower-cost-per-shower/",
      "title": "Electric shower cost per shower and shorter-use scenario",
      "question": "Calculate point-of-use shower electricity from selected kW and minutes, then add optional metered water costs without mixing in external hot-water energy.",
      "shortAnswer": "A point-of-use electric shower uses selected electrical kW multiplied by shower minutes divided by 60. Multiply by shower count and your tariff. Water and wastewater can be added separately using measured flow and a variable rate; a mixer shower needs a calculation for its own heat source.",
      "topic": "Water heating",
      "region": "UK",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electric-shower-running-cost/",
      "sources": [
        {
          "id": "est-showers",
          "name": "Energy Saving Trust: hot-water use and shower routines",
          "url": "https://energysavingtrust.org.uk/top-tips-to-save-energy-and-money-in-the-bathroom/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "nist-gallon",
          "name": "NIST: US customary and metric volume conversion factors",
          "url": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "kettle-cost-per-boil",
      "canonical": "https://wattandhome.com/guides/kettle-cost-per-boil/",
      "title": "Kettle cost per boil, water quantity and keep-warm use",
      "question": "Price the complete boil from measured electricity or input watts and time, and keep separate warming outside that measurement.",
      "shortAnswer": "Kettle cost per boil is complete-boil electrical kWh multiplied by your price per kWh. Input watts times boiling minutes can estimate energy when draw is steady. Compare the same volume and temperatures, and add keep-warm use only when it is outside the measured boil.",
      "topic": "Cooking",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/kettle-running-cost/",
      "sources": [
        {
          "id": "est-kettle",
          "name": "Energy Saving Trust: only heat the water needed for the task",
          "url": "https://energysavingtrust.org.uk/your-top-five-tips-to-save-energy-in-the-kitchen/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "air-purifier-electricity-and-filter-cost",
      "canonical": "https://wattandhome.com/guides/air-purifier-electricity-and-filter-cost/",
      "title": "Air purifier running cost: electricity and filters",
      "question": "Model purifier operating speeds and measured daily electricity, then budget filter replacements without treating low watts as equivalent cleaning performance.",
      "shortAnswer": "An air purifier’s electricity cost depends on average input at each speed and its operating hours, or representative measured kWh. Filter-set cost and replacement interval add a separate budget. Compare CADR, speed, noise and room suitability alongside cost; fewer watts alone do not establish better air cleaning.",
      "topic": "Air quality",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/air-purifier-running-cost/",
      "sources": [
        {
          "id": "energy-star-air-cleaner-criteria",
          "name": "ENERGY STAR: room air-cleaner power, CADR and filter reporting",
          "url": "https://www.energystar.gov/products/air_purifiers_cleaners/key_product_criteria",
          "region": "US",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "energy-star-air-cleaners",
          "name": "ENERGY STAR: air-cleaner room suitability and clean-air delivery",
          "url": "https://www.energystar.gov/products/air_cleaners",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "electric-water-heater-running-cost",
      "canonical": "https://wattandhome.com/guides/electric-water-heater-running-cost/",
      "title": "Electric water heater cost: measured kWh and on-time",
      "question": "Choose a valid electricity boundary for an immersion or storage heater, distinguish element-on hours from timer windows, and price your own period.",
      "shortAnswer": "Price a water heater from measured electrical kWh or a declared annual electricity figure with its test context. For a resistance element, input kW times actual on-hours can estimate energy. A timer window is not necessarily heating time, and useful hot-water heat is different from purchased electricity.",
      "topic": "Water heating",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electric-water-heater-running-cost/",
      "sources": [
        {
          "id": "eu-water-heaters",
          "name": "European Commission: water-heater types, label profiles and energy",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/water-heaters_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "doe-hpwh-study-record",
          "name": "US Department of Energy: NBI 2023 plug-in HPWH field-study record",
          "url": "https://heatpumpdata.energy.gov/data/studies/nbi-2023-plug-hpwh",
          "region": "US",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        }
      ]
    },
    {
      "id": "appliance-active-idle-standby-modes",
      "canonical": "https://wattandhome.com/guides/appliance-active-idle-standby-modes/",
      "title": "Add active, idle and standby electricity correctly",
      "question": "Build a daily appliance routine from separate modes, check the 24-hour boundary and avoid adding standby to a measurement that already contains it.",
      "shortAnswer": "For separate operating modes, sum average watts multiplied by non-overlapping hours and divide by 1,000 to get daily kWh. Total daily hours must not exceed 24. Unassigned hours remain excluded, and measured whole-day energy must not be combined with mode estimates covering the same period.",
      "topic": "Electronics",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electricity-cost/",
      "sources": [
        {
          "id": "rmld-electricity-use",
          "name": "Reading Municipal Light Department: Electricity use and bill calculations",
          "url": "https://www.rmld.com/258/Electricity-Use-My-Bill",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "doe-standby-measurement",
          "name": "US Department of Energy: Measuring standby power",
          "url": "https://www.energy.gov/cmei/femp/measuring-standby-power",
          "region": "US",
          "checkedOn": "2026-10-14"
        }
      ]
    },
    {
      "id": "washing-dishwasher-complete-cost-per-cycle",
      "canonical": "https://wattandhome.com/guides/washing-dishwasher-complete-cost-per-cycle/",
      "title": "Full wash-cycle costs: electricity, water and detergent",
      "question": "Calculate the variable cost of washing or dishwashing using separate electricity, water, wastewater and consumable inputs with explicit missing components.",
      "shortAnswer": "Add cycle electricity cost, consumption-related water and wastewater cost, detergent and other entered consumables to estimate an included variable-cost subtotal. Keep each component separate. Missing prices remain excluded, fixed fees are not per-cycle savings, and water-heating energy already in a source must not be added twice.",
      "topic": "Laundry",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/washing-machine-running-cost/",
      "sources": [
        {
          "id": "eu-washing-label",
          "name": "European Commission: Washing-machine energy labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/washing-machines_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "eu-dishwasher-label",
          "name": "European Commission: Dishwasher labels",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/dishwashers_en",
          "region": "EU",
          "checkedOn": "2026-10-02"
        },
        {
          "id": "bosch-smd6ycx01-fiche",
          "name": "Bosch SMD6YCX01G product information sheet: eco cycle energy and duration",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/SMD6YCX01G.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "nist-gallon",
          "name": "NIST: US customary and metric volume conversion factors",
          "url": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "compare-appliance-model-documents",
      "canonical": "https://wattandhome.com/guides/compare-appliance-model-documents/",
      "title": "Compare appliance models without mixing test bases",
      "question": "Use exact model suffixes, market, capacity, programme and document dates to build a supported comparison from a limited sourced model library.",
      "shortAnswer": "Compare exact models on the same market, capacity and compatible programme basis. A document date, reference check date, price date and actual measurement date mean different things. The model library checks recorded compatibility before transfer, while the user still confirms configuration and performance from the original documents.",
      "topic": "Buying decisions",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/appliance-comparison/",
      "sources": [
        {
          "id": "eu-eprel",
          "name": "European Commission: EPREL for consumers",
          "url": "https://energy-efficient-products.ec.europa.eu/consumers_en",
          "region": "EU",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "ftc-energyguide",
          "name": "FTC: How to use the EnergyGuide label",
          "url": "https://consumer.ftc.gov/articles/how-use-energyguide-label-shop-home-appliances",
          "region": "US",
          "checkedOn": "2026-10-01"
        },
        {
          "id": "bosch-wqh246dr-fiche",
          "name": "Bosch WQH246DRGB eco-cycle information sheet, dated 22 September 2026",
          "url": "https://media3.bosch-home.com/Documents/eudatasheet/en-GB/WQH246DRGB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-wrb247c9-fiche",
          "name": "Bosch WRB247C9GB eco-cycle information sheet, dated 22 September 2026",
          "url": "https://media3.bosch-home.com/Documents/eudatasheet/en-GB/WRB247C9GB.pdf",
          "region": "UK",
          "checkedOn": "2026-10-03"
        },
        {
          "id": "bosch-wgb244040-fiche",
          "name": "Bosch WGB244040: manufacturer product information sheet",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/de-DE/WGB244040.pdf",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "bosch-wgg244f40-fiche",
          "name": "Bosch WGG244F40: manufacturer product information sheet",
          "url": "https://media3.bsh-group.com/Documents/eudatasheet/de-DE/WGG244F40.pdf",
          "region": "EU",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "lumens-vs-watts-lighting-comparison",
      "canonical": "https://wattandhome.com/guides/lumens-vs-watts-lighting-comparison/",
      "title": "Lumens versus watts: compare suitable lighting",
      "question": "Choose similar light output and suitable fittings before comparing input power, label consumption and replacement payback.",
      "shortAnswer": "Lumens describe light output, while input watts describe electrical power. Compare suitable brightness, fitting, dimming and light quality before pricing a replacement. An equivalent-incandescent wattage is a brightness comparison, not the LED’s electrical input; label kWh per 1,000 hours has another stated basis.",
      "topic": "Lighting",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/lighting-cost-and-led-payback/",
      "sources": [
        {
          "id": "est-lighting",
          "name": "Energy Saving Trust: light output, compatibility and energy-saving lighting",
          "url": "https://energysavingtrust.org.uk/advice/lighting/",
          "region": "UK",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "eu-light-sources",
          "name": "European Commission: light-source labels and electrical energy units",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/light-sources_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "water-heater-storage-losses-and-boundaries",
      "canonical": "https://wattandhome.com/guides/water-heater-storage-losses-and-boundaries/",
      "title": "Water heater losses: useful heat versus electricity",
      "question": "Separate the water-heating task from purchased electricity, clarify storage and distribution losses and avoid combining efficiency metrics on incompatible boundaries.",
      "shortAnswer": "Useful heat in hot water and purchased electrical energy are different quantities. Measured water-heater electricity already contains losses inside its meter boundary. A resistance-only water-volume scenario needs explicit conversion and extra electrical-loss assumptions; a heat-pump COP or UEF cannot be substituted into it without a compatible model.",
      "topic": "Water heating",
      "region": "general",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electric-water-heater-running-cost/",
      "sources": [
        {
          "id": "eu-water-heaters",
          "name": "European Commission: water-heater types, label profiles and energy",
          "url": "https://energy-efficient-products.ec.europa.eu/product-list/water-heaters_en",
          "region": "EU",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "doe-hpwh-study-record",
          "name": "US Department of Energy: NBI 2023 plug-in HPWH field-study record",
          "url": "https://heatpumpdata.energy.gov/data/studies/nbi-2023-plug-hpwh",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    },
    {
      "id": "published-heat-pump-water-heater-measurements",
      "canonical": "https://wattandhome.com/guides/published-heat-pump-water-heater-measurements/",
      "title": "Measured heat-pump water heaters: a published field study",
      "question": "Reprice a clearly attributed California field-study average, keep aggregate measurements separate from household readings and distinguish measured electricity from modeled fuel comparisons.",
      "shortAnswer": "A 2023 New Buildings Institute field study reports monitored 120-volt heat-pump water heaters at 32 California customer sites. Its Table 9 gives aggregate weekday and weekend electrical-use averages. These are externally measured study averages, not Watt & Home readings or predictions for every water heater.",
      "topic": "Water heating",
      "region": "US",
      "additionalRegions": [],
      "editoriallyUpdatedOn": "2026-10-15",
      "relatedCalculator": "https://wattandhome.com/calculators/electric-water-heater-running-cost/",
      "sources": [
        {
          "id": "nbi-hpwh-study",
          "name": "New Buildings Institute: 2023 plug-in heat-pump water-heater field study, Table 9",
          "url": "https://heatpumpdata.energy.gov/system/files/files/cchp-2025-01/PlugInHeatPumpWaterHeaterFieldStudyFindingsAndMarketCommercializationRecommendations_NBI202308.pdf",
          "region": "US",
          "checkedOn": "2026-10-15"
        },
        {
          "id": "doe-hpwh-study-record",
          "name": "US Department of Energy: NBI 2023 plug-in HPWH field-study record",
          "url": "https://heatpumpdata.energy.gov/data/studies/nbi-2023-plug-hpwh",
          "region": "US",
          "checkedOn": "2026-10-15"
        }
      ]
    }
  ],
  "models": [
    {
      "id": "bosch-kgn34nlea",
      "name": "Bosch KGN34NLEAG",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-kgn34nlea",
      "appliance": "fridge",
      "market": "GB",
      "capacity": {
        "value": 300,
        "unit": "litres",
        "description": "300 litres"
      },
      "declaredElectricity": {
        "value": 244,
        "unit": "kWh/year",
        "testBasis": "Annual declaration under Regulation (EU) 2019/2016"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-fridge-annual",
      "source": {
        "id": "bosch-kgn34nlea-fiche",
        "name": "Bosch KGN34NLEAG: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/KGN34NLEAG.pdf",
        "region": "UK",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-kgn392ldf",
      "name": "Bosch KGN392LDFG",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-kgn392ldf",
      "appliance": "fridge",
      "market": "GB",
      "capacity": {
        "value": 363,
        "unit": "litres",
        "description": "363 litres"
      },
      "declaredElectricity": {
        "value": 203,
        "unit": "kWh/year",
        "testBasis": "Annual declaration under Regulation (EU) 2019/2016"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-fridge-annual",
      "source": {
        "id": "bosch-kgn392ldf-fiche",
        "name": "Bosch KGN392LDFG: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/KGN392LDFG.pdf",
        "region": "UK",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-kgn39aiat",
      "name": "Bosch KGN39AIAT",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-kgn39aiat",
      "appliance": "fridge",
      "market": "EU",
      "capacity": {
        "value": 363,
        "unit": "litres",
        "description": "363 litres"
      },
      "declaredElectricity": {
        "value": 104,
        "unit": "kWh/year",
        "testBasis": "Annual declaration under Regulation (EU) 2019/2016"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "EU-fridge-annual",
      "source": {
        "id": "bosch-kgn39aiat-fiche",
        "name": "Bosch KGN39AIAT: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/de-DE/KGN39AIAT.pdf",
        "region": "EU",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-kgn39vlea",
      "name": "Bosch KGN39VLEA",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-kgn39vlea",
      "appliance": "fridge",
      "market": "EU",
      "capacity": {
        "value": 368,
        "unit": "litres",
        "description": "368 litres"
      },
      "declaredElectricity": {
        "value": 238,
        "unit": "kWh/year",
        "testBasis": "Annual declaration under Regulation (EU) 2019/2016"
      },
      "documentVersion": "Product sheet dated 18 October 2022",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "EU-fridge-annual",
      "source": {
        "id": "bosch-kgn39vlea-fiche",
        "name": "Bosch KGN39VLEA: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/de-DE/KGN39VLEA.pdf",
        "region": "EU",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-smd6ycx01",
      "name": "Bosch SMD6YCX01G",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-smd6ycx01",
      "appliance": "dishwasher",
      "market": "GB",
      "capacity": {
        "value": 14,
        "unit": "places",
        "description": "14 place settings"
      },
      "declaredElectricity": {
        "value": 0.543,
        "unit": "kWh/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "declaredCycleWater": {
        "value": 9.5,
        "unit": "litres/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-dishwasher-eco-cold-fill",
      "source": {
        "id": "bosch-smd6ycx01-fiche",
        "name": "Bosch SMD6YCX01G product information sheet: eco cycle energy and duration",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/SMD6YCX01G.pdf",
        "region": "UK",
        "checkedOn": "2026-10-03"
      }
    },
    {
      "id": "bosch-sms4eki06",
      "name": "Bosch SMS4EKI06G",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-sms4eki06",
      "appliance": "dishwasher",
      "market": "GB",
      "capacity": {
        "value": 13,
        "unit": "places",
        "description": "13 place settings"
      },
      "declaredElectricity": {
        "value": 0.635,
        "unit": "kWh/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "declaredCycleWater": {
        "value": 9,
        "unit": "litres/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-dishwasher-eco-cold-fill",
      "source": {
        "id": "bosch-sms4eki06-fiche",
        "name": "Bosch SMS4EKI06G: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/SMS4EKI06G.pdf",
        "region": "UK",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-sms4emi06",
      "name": "Bosch SMS4EMI06E",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-sms4emi06",
      "appliance": "dishwasher",
      "market": "EU",
      "capacity": {
        "value": 14,
        "unit": "places",
        "description": "14 place settings"
      },
      "declaredElectricity": {
        "value": 0.645,
        "unit": "kWh/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "declaredCycleWater": {
        "value": 9,
        "unit": "litres/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "EU-dishwasher-eco-cold-fill",
      "source": {
        "id": "bosch-sms4emi06-fiche",
        "name": "Bosch SMS4EMI06E: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/de-DE/SMS4EMI06E.pdf",
        "region": "EU",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-sms6zci49",
      "name": "Bosch SMS6ZCI49E",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-sms6zci49",
      "appliance": "dishwasher",
      "market": "EU",
      "capacity": {
        "value": 14,
        "unit": "places",
        "description": "14 place settings"
      },
      "declaredElectricity": {
        "value": 0.747,
        "unit": "kWh/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "declaredCycleWater": {
        "value": 9.5,
        "unit": "litres/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "EU-dishwasher-eco-cold-fill",
      "source": {
        "id": "bosch-sms6zci49-fiche",
        "name": "Bosch SMS6ZCI49E: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/de-DE/SMS6ZCI49E.pdf",
        "region": "EU",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-sps4hmi14",
      "name": "Bosch SPS4HMI14G",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-sps4hmi14",
      "appliance": "dishwasher",
      "market": "GB",
      "capacity": {
        "value": 10,
        "unit": "places",
        "description": "10 place settings"
      },
      "declaredElectricity": {
        "value": 0.674,
        "unit": "kWh/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "declaredCycleWater": {
        "value": 8.9,
        "unit": "litres/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-dishwasher-eco-cold-fill",
      "source": {
        "id": "bosch-sps4hmi14-fiche",
        "name": "Bosch SPS4HMI14G: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/SPS4HMI14G.pdf",
        "region": "UK",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-sps4hmw49",
      "name": "Bosch SPS4HMW49G",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-sps4hmw49",
      "appliance": "dishwasher",
      "market": "GB",
      "capacity": {
        "value": 10,
        "unit": "places",
        "description": "10 place settings"
      },
      "declaredElectricity": {
        "value": 0.755,
        "unit": "kWh/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "declaredCycleWater": {
        "value": 9.5,
        "unit": "litres/cycle",
        "testBasis": "Eco programme with cold water fill"
      },
      "documentVersion": "Product sheet dated 24 February 2024",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-dishwasher-eco-cold-fill",
      "source": {
        "id": "bosch-sps4hmw49-fiche",
        "name": "Bosch SPS4HMW49G: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/SPS4HMW49G.pdf",
        "region": "UK",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-wan28258",
      "name": "Bosch WAN28258GB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wan28258",
      "appliance": "washer",
      "market": "GB",
      "capacity": {
        "value": 8,
        "unit": "kg",
        "description": "8 kg"
      },
      "declaredElectricity": {
        "value": 0.461,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "declaredCycleWater": {
        "value": 47,
        "unit": "litres/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "documentVersion": "Product sheet dated 28 November 2025",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-washer-weighted-eco",
      "source": {
        "id": "bosch-wan28258-fiche",
        "name": "Bosch: WAN28258GB product information sheet, dated 28 November 2025",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WAN28258GB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-01"
      }
    },
    {
      "id": "bosch-wgb244040",
      "name": "Bosch WGB244040",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wgb244040",
      "appliance": "washer",
      "market": "EU",
      "capacity": {
        "value": 9,
        "unit": "kg",
        "description": "9 kg"
      },
      "declaredElectricity": {
        "value": 0.395,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "declaredCycleWater": {
        "value": 50,
        "unit": "litres/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "EU-washer-weighted-eco",
      "source": {
        "id": "bosch-wgb244040-fiche",
        "name": "Bosch WGB244040: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/de-DE/WGB244040.pdf",
        "region": "EU",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-wgb256a1",
      "name": "Bosch WGB256A1GB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wgb256a1",
      "appliance": "washer",
      "market": "GB",
      "capacity": {
        "value": 10,
        "unit": "kg",
        "description": "10 kg"
      },
      "declaredElectricity": {
        "value": 0.41,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "declaredCycleWater": {
        "value": 49,
        "unit": "litres/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "documentVersion": "Product sheet dated 2 February 2025",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-washer-weighted-eco",
      "source": {
        "id": "bosch-wgb256a1-fiche",
        "name": "Bosch WGB256A1GB: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WGB256A1GB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-wgg04409",
      "name": "Bosch WGG04409GB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wgg04409",
      "appliance": "washer",
      "market": "GB",
      "capacity": {
        "value": 9,
        "unit": "kg",
        "description": "9 kg"
      },
      "declaredElectricity": {
        "value": 0.464,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "declaredCycleWater": {
        "value": 48,
        "unit": "litres/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "documentVersion": "Product sheet dated 18 February 2025",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-washer-weighted-eco",
      "source": {
        "id": "bosch-wgg04409-fiche",
        "name": "Bosch WGG04409GB: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WGG04409GB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-wgg244f40",
      "name": "Bosch WGG244F40",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wgg244f40",
      "appliance": "washer",
      "market": "EU",
      "capacity": {
        "value": 9,
        "unit": "kg",
        "description": "9 kg"
      },
      "declaredElectricity": {
        "value": 0.489,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "declaredCycleWater": {
        "value": 50,
        "unit": "litres/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "EU-washer-weighted-eco",
      "source": {
        "id": "bosch-wgg244f40-fiche",
        "name": "Bosch WGG244F40: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/de-DE/WGG244F40.pdf",
        "region": "EU",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-wgg244zc",
      "name": "Bosch WGG244ZCGB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wgg244zc",
      "appliance": "washer",
      "market": "GB",
      "capacity": {
        "value": 9,
        "unit": "kg",
        "description": "9 kg"
      },
      "declaredElectricity": {
        "value": 0.489,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "documentVersion": "Product sheet dated 27 August 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-washer-weighted-eco",
      "source": {
        "id": "bosch-wgg244zc-fiche",
        "name": "Bosch WGG244ZCGB product information sheet, dated 27 August 2026",
        "url": "https://media3.bosch-home.com/Documents/eudatasheet/en-GB/WGG244ZCGB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-03"
      }
    },
    {
      "id": "bosch-wgg254z0",
      "name": "Bosch WGG254Z0GB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wgg254z0",
      "appliance": "washer",
      "market": "GB",
      "capacity": {
        "value": 10,
        "unit": "kg",
        "description": "10 kg"
      },
      "declaredElectricity": {
        "value": 0.511,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "declaredCycleWater": {
        "value": 50,
        "unit": "litres/cycle",
        "testBasis": "Weighted eco 40–60 programme"
      },
      "documentVersion": "Product sheet dated 11 December 2025",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-washer-weighted-eco",
      "source": {
        "id": "bosch-wgg254z0-fiche",
        "name": "Bosch WGG254Z0GB: manufacturer product information sheet",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WGG254Z0GB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "bosch-wqg241001",
      "name": "Bosch WQG241001",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wqg241001",
      "appliance": "dryer",
      "market": "EU",
      "capacity": {
        "value": 9,
        "unit": "kg",
        "description": "9 kg"
      },
      "declaredElectricity": {
        "value": 1.28,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco drying programme"
      },
      "documentVersion": "Product sheet dated 21 September 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "EU-dryer-weighted-eco",
      "source": {
        "id": "bosch-wqg241001-fiche",
        "name": "Bosch WQG241001 EU eco-cycle information sheet, dated 21 September 2026",
        "url": "https://media3.bosch-home.com/Documents/eudatasheet/de-DE/WQG241001.pdf",
        "region": "EU",
        "checkedOn": "2026-10-03"
      }
    },
    {
      "id": "bosch-wqh246dr",
      "name": "Bosch WQH246DRGB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wqh246dr",
      "appliance": "dryer",
      "market": "GB",
      "capacity": {
        "value": 9,
        "unit": "kg",
        "description": "9 kg"
      },
      "declaredElectricity": {
        "value": 0.92,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco drying programme"
      },
      "documentVersion": "Product sheet dated 22 September 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-dryer-weighted-eco",
      "source": {
        "id": "bosch-wqh246dr-fiche",
        "name": "Bosch WQH246DRGB eco-cycle information sheet, dated 22 September 2026",
        "url": "https://media3.bosch-home.com/Documents/eudatasheet/en-GB/WQH246DRGB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-03"
      }
    },
    {
      "id": "bosch-wrb247c40",
      "name": "Bosch WRB247C40",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wrb247c40",
      "appliance": "dryer",
      "market": "EU",
      "capacity": {
        "value": 9,
        "unit": "kg",
        "description": "9 kg"
      },
      "declaredElectricity": {
        "value": 0.79,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco drying programme"
      },
      "documentVersion": "Product sheet dated 21 September 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "EU-dryer-weighted-eco",
      "source": {
        "id": "bosch-wrb247c40-fiche",
        "name": "Bosch WRB247C40 EU eco-cycle information sheet, dated 21 September 2026",
        "url": "https://media3.bosch-home.com/Documents/eudatasheet/de-DE/WRB247C40.pdf",
        "region": "EU",
        "checkedOn": "2026-10-03"
      }
    },
    {
      "id": "bosch-wrb247c9",
      "name": "Bosch WRB247C9GB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wrb247c9",
      "appliance": "dryer",
      "market": "GB",
      "capacity": {
        "value": 9,
        "unit": "kg",
        "description": "9 kg"
      },
      "declaredElectricity": {
        "value": 0.79,
        "unit": "kWh/cycle",
        "testBasis": "Weighted eco drying programme"
      },
      "documentVersion": "Product sheet dated 22 September 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-dryer-weighted-eco",
      "source": {
        "id": "bosch-wrb247c9-fiche",
        "name": "Bosch WRB247C9GB eco-cycle information sheet, dated 22 September 2026",
        "url": "https://media3.bosch-home.com/Documents/eudatasheet/en-GB/WRB247C9GB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-03"
      }
    },
    {
      "id": "bosch-wth85223",
      "name": "Bosch WTH85223GB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wth85223",
      "appliance": "dryer",
      "market": "GB",
      "capacity": {
        "value": 8,
        "unit": "kg",
        "description": "8 kg"
      },
      "declaredElectricity": {
        "value": 1.87,
        "unit": "kWh/cycle",
        "testBasis": "Legacy standard-cotton programme at full rated load"
      },
      "documentVersion": "Product fiche dated 2 July 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-dryer-legacy-full-cotton",
      "source": {
        "id": "bosch-wth85223-fiche",
        "name": "Bosch: WTH85223GB dryer fiche, dated 2 July 2026",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WTH85223GB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-01"
      }
    },
    {
      "id": "bosch-wtn83203",
      "name": "Bosch WTN83203GB",
      "canonical": "https://wattandhome.com/appliance-examples/#model-bosch-wtn83203",
      "appliance": "dryer",
      "market": "GB",
      "capacity": {
        "value": 8,
        "unit": "kg",
        "description": "8 kg"
      },
      "declaredElectricity": {
        "value": 4.71,
        "unit": "kWh/cycle",
        "testBasis": "Legacy standard-cotton programme at full rated load"
      },
      "documentVersion": "Product fiche dated 6 September 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "GB-dryer-legacy-full-cotton",
      "source": {
        "id": "bosch-wtn83203-fiche",
        "name": "Bosch: WTN83203GB dryer fiche, dated 6 September 2026",
        "url": "https://media3.bsh-group.com/Documents/eudatasheet/en-GB/WTN83203GB.pdf",
        "region": "UK",
        "checkedOn": "2026-10-01"
      }
    },
    {
      "id": "ge-gte19",
      "name": "GE GTE19JSN****",
      "canonical": "https://wattandhome.com/appliance-examples/#model-ge-gte19",
      "appliance": "fridge",
      "market": "US",
      "capacity": {
        "value": 19.2,
        "unit": "ft3",
        "description": "19.2 ft³ · no ice maker"
      },
      "declaredElectricity": {
        "value": 379,
        "unit": "kWh/year",
        "testBasis": "Registry annual energy for the specified top-freezer configuration"
      },
      "documentVersion": "Registry export captured 14 October 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "US-fridge-annual",
      "source": {
        "id": "energy-star-gte19-record",
        "name": "ENERGY STAR GE GTE19JSN**** registry 2350114, export captured 14 October 2026",
        "url": "https://www.energystar.gov/productfinder/product/certified-residential-refrigerators/details/2350114/export/pdf",
        "region": "US",
        "checkedOn": "2026-10-15"
      }
    },
    {
      "id": "whirlpool-wrt549",
      "name": "Whirlpool WRT549SZD*",
      "canonical": "https://wattandhome.com/appliance-examples/#model-whirlpool-wrt549",
      "appliance": "fridge",
      "market": "US",
      "capacity": {
        "value": 19.3,
        "unit": "ft3",
        "description": "19.3 ft³ · no ice maker"
      },
      "declaredElectricity": {
        "value": 378,
        "unit": "kWh/year",
        "testBasis": "Registry annual energy; specified top-freezer configuration"
      },
      "documentVersion": "Registry export captured 14 October 2026",
      "documentPage": 1,
      "referenceCheckedOn": "2026-10-15",
      "comparisonGroup": "US-fridge-annual",
      "source": {
        "id": "energy-star-wrt549-record",
        "name": "ENERGY STAR: Whirlpool WRT549SZD*, registry ID 2218984",
        "url": "https://www.energystar.gov/productfinder/product/certified-residential-refrigerators/details/2218984/export/pdf",
        "region": "US",
        "checkedOn": "2026-10-15"
      }
    }
  ]
}