‘Part L’ of the Building Regulations covers the conservation of Energy in our homes, offices and other
buildings. It sets high standards for architects, engineers and contractors to create a more sustainable
environment.
In May 2006, the government released a guide the Domestic Heating
Compliance guide. This guide outlines the requirement for both new or replacement central heating
systems in domestic households.
The Compliance guide utilises industry approved practices and allows boiler manufactures to influence
which products are compatible with each boiler.

For Gas fired Central Heating Systems the compliance guide specifies that new boilers should have a
minimum efficiency of 86% as defined by its SEDBUK* value and minimum provisions must be met for

System Circulation
Hot Water Storage
Specific Controls Must be installed and Pipework Insulation

* Seasonal Efficiency of Domestic Boilers in the UK