Written question asked by Lord Strathcarron (Non-affiliated) on Thursday, 5 February 2026, in the House of Lords. It was due for an answer on Thursday, 19 February 2026. It was answered by Lord Whitehead (Labour) on Tuesday, 17 February 2026 on behalf of the Department for Energy Security and Net Zero.

Boilers

Question: 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.

Answer: 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.

Secondary information