The space heating in a dwelling is considered when calculating energy use in DEAP.

Support for BER assessors

This section provides BER assessors with further information about Building Regulations and Standards in DEAP assessments.

You'll find the core information for DEAP assessments in these documents:


DEAP assumes that all dwellings have heating systems that can heat the entire space. Calculations take account of a main heating system and secondary heaters as described in Appendix A of the DEAP manual.

Guidance and tools

Domestic fuel cost

Compare energy costs for heating and carry out a fuel cost comparison for the correct heating input in DEAP.

Solar space heating calculations

Calculate the energy contribution from solar space heating for use in DEAP. These tools calculate the contribution of solar thermal systems to domestic hot water and space heating in dwellings for individual or group heating systems.

Heating and domestic hot water systems guide

This guide from the Department of Housing, Local Government and Heritage covers conventional means to provide primary and secondary space heating and domestic hot water for dwellings. It is the supporting document referred to in Building Regulations TGD L & Energy Performance of Buildings Regulations 2019 Dwellings Part

It is a source of guidance on compliance with the requirements of the Building Regulations for space heating systems and hot water systems.


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