Delivering retrofit at scale, Low carbon heating, Retrofit technical considerations

Low Carbon Heat Networks

Introduction

To ensure large scale retrofit projects meet the intended outcomes of the works, it is recommended that installers of low carbon heat systems must be certified to Microgeneration Certification Scheme (MCS) standards for the technology they are installing. MCS certification requires an installation company to be assessed by an affiliated certification body, and to have demonstrated suitable competency against relevant technology standards, as well as conduct installations in accordance with MCS installation standards.

Published: 16 March 2026

Where a communal heat network or district heating scheme is to be installed, this must be done in accordance with the Heat Trust Consumer Protection Scheme. Once regulations introduce mandatory minimum heat network technical requirements, expected in 2025, the installation of communal and district schemes must comply with these requirements and follow the processes set out under the Heat Network Technical Assurance Scheme (HNTAS) (see below).

Prior to technical standards regulation, whilst not a formal requirement, the installation of communal and district heating systems should aim to be in accordance with CIBSE’s Code of Practice 1 (2020).

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