Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what estimate she has made of the proportion of households with heat pumps installed (a) as of 4 September 2023, (b) in July 2013 and (c) in July 2011.

The Government does not hold comprehensive information on the total number of households with a heat pump installed.

However, since 2007, heat pumps installed under Government grants have been recorded on the Microgeneration Certification Scheme Installations Database, which shows the number of recorded heat pumps installed across the UK as:

• 9,057 in July 2011 (approximately 0.03% of total households).

• 29,810 in July 2013 (approximately 0.11% of total households).

• 200,422 in July 2023 (approximately 0.71% of total households).

The database does not include all heat pump installations. For example, heat pumps installed without Government funding support, such as in new buildings, are not typically recorded in the Microgeneration Certification Scheme Installations Database.