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Effective 1 April 2005

Domestic gas boilers installed must be high effiiency condensing boliers rated A or B (SEDBUK rating).

Minimum requirements for heating controls must be met.

Installers must be Corgi registered and trained in energy efficiency and the new condensing boiler Building Regulations.

On completion of installation the householder receives a certificate from the local authority confirming that the boiler complies with the new regulations.

Other types of boilers will only be installed where it is not feasible to fit a condensing boiler.

Seasonal Efficiency of Domestic Boilers in the UK. Developed under the Government's Energy Efficiency Best Practice Programme - it provides a basis for fair comparison of different models.

It measures the average annual efficiency in typical domestic conditions.

Central heating boilers come with a SEDBUK rating - all Worcester Bosch Greenstar Condensing Boilers are rated A (90% and above efficiency).

What is a system boiler?

A system boiler differs from a regular boiler as many individual components of the heating and hot water system are built in.

Hot water is pumped from the boiler through the system which results in faster response and gives cost savings.

Works on the principle of stored hot water.