The short answer
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.
Use the compare appliance costs calculatorOn this page
Start with the exact model rather than a series name
A series can contain different capacities, configurations and model suffixes. Retain the complete identifier printed on the document. A wildcard in a registry record identifies a defined family and needs its configuration checked; it is not permission to apply its consumption to every related product.
The model library contains 25 curated input records across fridges, washers, dryers and dishwashers. It is a limited collection rather than an exhaustive catalogue. Its filters expose market, type and capacity without implying that every current retail model is covered.
Check compatible service and test conditions
Use matching declared capacity, then examine programme, load weighting, cold/hot-water fill, climate and product configuration where relevant. The library blocks a transfer when recorded type, market, capacity or test group differs. Passing those checks is a first screen, not proof of equal performance.
A weighted eco drying figure and a legacy full-load cotton figure describe different tasks. Replacing both units with kWh/cycle does not remove that difference. Similarly, an annual label can reflect an embedded cycle frequency rather than your own household year.
Retain the version and the check date
Each record shows the document version and when we checked that reference. The former identifies the source; the latter records our review. Neither establishes live stock, today’s price or a date when a household test occurred.
An old document can still be informative for an existing appliance, but should not be presented as a current retail recommendation. The library carries declarations directly into tools with source context. Optional water figures retain their per-cycle unit, with water pricing left to the visitor.
Convert units without changing the task
For compatible cycle figures, annual kWh is kWh/cycle × common cycles/week × 52. A per-100-cycle value is divided by 100 first. Annual declarations are priced directly unless a documented, valid adjustment is made elsewhere.
For the existing GB 9 kg weighted-eco dryer examples, 0.92 and 0.79 kWh/cycle differ by 0.13 kWh/cycle. At four cycles/week and an illustrative £0.28/kWh, annual electricity savings are £7.5712. At three cycles/week they are £5.6784. Routine matters even when the source values match well.
Enter actual candidate prices
The comparison form requests both purchase prices and your electricity tariff. It does not infer current prices from the source documents. Choosing GBP, USD or EUR changes the cost unit; it does not convert a quote or establish a label market.
At an illustrative £100 price premium and £7.5712 annual electricity savings, simple premium payback is approximately 13.21 years. That is a scenario rather than a prediction of either dryer’s life. Repairs, financing, changed tariffs and other running costs remain outside that calculation.
Use the original source when a decision matters
Open both product documents before confirming comparable configuration and performance. Look up missing candidates through the relevant manufacturer, US EnergyGuide/registry source or EU EPREL entry. Do not fill a missing consumption value with the letter grade of another model.
Use the broader comparison guide for purchase versus replacement decisions. A working existing appliance needs the separate keep-versus-replace baseline, rather than the price difference between two new candidates.
A sourced same-capacity example with a modest saving
The library’s EU 9 kg washer records for Bosch WGB244040 and WGG244F40 declare 0.395 and 0.489 kWh per weighted eco 40–60 cycle in their product sheets dated 27 August 2026. These are manufacturer declarations, not independent Watt & Home measurements. Open the first sheet and the second sheet to review their complete context.
At an illustrative four cycles/week across 52 weeks, the 0.094 kWh/cycle difference becomes 19.552 kWh/year. With a separately assumed €0.30/kWh, annual electricity savings are €5.8656. Ten years of unchanged use and tariff cover €58.656 of extra price.
A €100 purchase premium would therefore remain unrecovered by electricity savings within that ten-year scenario. This is useful even though both candidates have matching recorded capacity and programme group: compatible input data does not make every price premium economical. Other features, purchase costs and actual programme use still need review.