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Clean Heat Market Mechanism: heat pump installation certification scheme

This page outlines details of the certification scheme for the Clean Heat Market Mechanism (CHMM) provided by the Microgeneration Certification Scheme (MCS).

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Details

From 12 December 2025, the Microgeneration Certification Scheme’s (MCS) new redeveloped scheme (“MCS:2025”) is approved as a certification scheme under the Clean Heat Market Mechanism (CHMM).

Further details are available from .

Installations carried out under the current MCS scheme will continue to be awarded CHMM credits during a transitional period until installers and certification bodies have all transitioned to MCS:2025.

Updates to this page

Published 12 December 2025

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