Question to the Department for Energy Security & Net Zero:
To ask His Majesty's Government what estimate they have made of the proportion of heat pump installations in the first scheme year that were attributable to the Clean Heat Market Mechanism.
The Clean Heat Market Mechanism (CHMM) supports the overall growth and development of the retrofit heat pump market, alongside a range of other Warm Homes Plan measures supporting heat pump uptake such as the Boiler Upgrade Scheme, which saw a record monthly high for applications in July 2026.
By underpinning the growth of the UK heat pump market and supply chains, the CHMM additionally supports progress towards the Warm Homes Plan's ambition for at least 70% of heat pumps installed in the UK to be domestically manufactured by 2035.