Building Regulations - Part L - Heating Systems

Part L- As of April 2005

All new and replacement boilers must be condensing High Efficiency (HE) (Sedbuk A or B)

On very rare occasions, where these boilers cannot easily be installed due to location and cost factors, an Exception can be given, based on a points scoring system. And a standard efficiency boiler can then be installed.

All radiators to be fitted with thermostatic radiator valves (TRV's), apart from the radiator installed in the same room as the room thermostat.

A room thermostat must be installed, to provide boiler interlock and improve efficiency of system (i.e. prevent system running non-stop after desired temperature is reached) thus saving you on heating bills.

Boiler interlock must be provided, i.e. a device that turns the boiler off when a set temperature is reached (room thermostat/cylinder timer/stat).

In a traditional system (tanks in loft, cylinder in airing cupboard and boiler separate), a full controls upgrade is usually required to include:

• Room thermostat
• Cylinder thermostat
• S or Y plan motorised valves
• Programmer