Guidance

Clean Heat Market Mechanism: heat pump installation certification

The process by which schemes applied to be an approved certification scheme for the Clean Heat Market Mechanism, and for approval under the Regulations.

• From: Department for Energy Security and Net Zero
• Published: 24 March 2025
• Last updated: 1 April 2025 — See all updates

This publication was withdrawn on 12 December 2025

This guidance is no longer in use.

Microgeneration Certification Scheme’s (MCS) new redeveloped installer scheme (“MCS:2025”) has been approved as a certification scheme under the Clean Heat Market Mechanism (CHMM).

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.

Documents

[Withdrawn] Clean Heat Market Mechanism: Approval of schemes for the certification of installations

PDF, 712 KB, 17 pages

[Withdrawn] Clean Heat Market Mechanism: Approval of schemes for the certification of installations

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Details

From 1 April 2025 the Microgeneration Certification Scheme (MCS) has been appointed by the Secretary of State as a certification scheme under the Regulations.

This document sets out the process by which the Secretary of State will decide whether to approve a certification scheme under the Clean Heat Market Mechanism Regulations 2024 (regulation 6).

It includes guidance for potential applicants on how to apply and demonstrate compliance with scheme requirements. The details of any certification scheme which is approved under this regulation will be published here.

This guidance only applied until 12 December 2025, when updated Clean Heat Market Mechanism (Amendment) Regulations 2025 came into force.

Published 24 March 2025

Last updated 1 April 2025 + show all updates

1. 1 April 2025

   From 1 April 2025 the Microgeneration Certification Scheme (MCS) has been appointed by the Secretary of State as a certification scheme under the Regulations.

2. 24 March 2025

   First published.