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Part L Energy Conservation

10. Individual domestic (micro) combined heat and power


This section provides guidance on the specification of micro-combined heat and power (CHP) systems for dwellings.

The following publication may be referred to: Appendix N of the Dwelling Energy Assessment Procedure (DEAP) for the energy rating of dwellings.

10.1 Scope of guidance

This section provides guidance on the specification of micro-combined heat and power (micro-CHP) packages for dwellings to meet relevant energy efficiency requirements in the Building Regulations.

The guidance covers micro-CHP systems with an electrical output less than 5 kWe which are:

• heat-led;

• capable of exporting electricity to the grid; and

• controlled in such a way as to avoid heat dumping.

British Standards

IS EN 15316-4-4:2017 Heating systems in buildings. Method for calculation of system energy requirements and system efficiencies. Heat generation systems, building-integrated cogeneration systems.

Other documents
Appendix N of DEAP 4.2.1 Method to evaluate the annual energy performance of micro-cogeneration heating systems in dwellings.

BSRIA BG 2/2007 CHP for existing buildings: Guidance on design and installation.

Microgeneration Certification Scheme standard MIS 3007-2 Requirements for contractors undertaking the design, supply, installation, set to work, commissioning and handover of a domestic hot water system containing an electricity-led micro-cogeneration package.

I.S. 10101:2020 National Rules for Electrical Installations.
Connecting a microgeneration system to a domestic or similar electrical installation (in parallel with the mains supply), Best Practice Guide, the Electrical Safety Council

Fire safety Energy Heat pumps Underfloor heating Underfloor heating pipes Air to water heat pump Air to air heat pump Air to ground heat pump IS 440 Time and temperature Tongue and groove Energy grants Building energy rating Energy performance certificate Retrofit assessment Home energy assessment Water pump Water tank Water membrane Water vapour membrane