Question to the Department for Energy Security & Net Zero:

To ask His Majesty's Government how they arrived at the estimate in the Clean Energy Campaign that it costs approximately £2,000 a year to heat a typical three-bedroom house with a gas boiler; and what assessment they have made of the accuracy of Ofgem’s estimate of the cost of heating a typical three-bedroom house with a gas boiler.

The cost estimates used in the Clean Energy Campaign are based on the total energy for a home with a gas boiler including both gas and electricity costs (e.g. for lighting and appliances). Details for the assumptions behind the analysis are provided in the section marked “*How we calculated heat pump savings” on the campaign web page https://cleanenergy.campaign.gov.uk/heat-pump/. The analysis in the campaign assumed an annual gas demand of 12,200kWh, which is well aligned to OFGEM’s ‘Medium’ typical domestic consumption value of 11,500kWh.