As every house is different it is difficult to predict exact running costs per household, several factors will impact how much the conversion will cost you to run. However tests show that when used to maximum efficiency (only running the Aga when required) daily running costs can be found to be around £1.80 per day or less (October 2022 price cap revision).
If you wish to try and run the AGA in a more traditional sense or if you are looking for more of that heat source to the room, this may well be considerably higher especially in the cooler seasons. For example running the ovens at 220° will result in costs of around £27 per week (October 2022 price cap revision). This may be offset by much lower running costs in the Summer season or utilising the optional timer kit to help manage and maintain running costs.
Leaving the hot plates on at low heat will increase running costs – for most efficient use, hobs should be turned on only for use.
WORKING EXAMPLE OF RUNNING COSTS
The developers of the conversion produced a field trial usage figures (calculated over a 12 month period in 2011) have been adjusted to reflect the new April 2022 price cap of 28p Kw/h.
The users in question were a household of 2 working during the day.
The converted Aga was used as follows:
3 months timed operation on times 06.00 – 09.00 / 16:00 – 21.30 – 615Kw used
3 months switched on when needed for cooking – 287Kw used
3 months timed operation on times 06:00 – 09:00 / 16.00 – 21.30 – 454Kw used
3 months with oven on 24 hours a day – 708Kw used
The hobs were used only when required, this gave a total annual usage of 2064KW used.
This works out as an average weekly running cost of £13.49 per week. (Based on October 2022 price cap from OFGEM)