Question to the Department for Business, Energy and Industrial Strategy:

To ask the Secretary of State for Business, Energy and Industrial Strategy, pursuant to the Answer of 1 May to Question 245593 on Boilers: Natural Gas, what assessment his Department has made of the operational efficiency of domestic boilers once installed between 2005 and 2019.

Current standards require all new gas boilers installed in English homes to be A rated. Research on real-world boiler performance has been carried out to inform the representation of gas boilers in the government’s Standard Assessment Procedure (SAP). Further information can be found on the Building Research Establishment (BRE) website. BRE deliver the SAP contract on behalf of the government.