A condensing boiler captures much more usable heat from its fuel than a non-condensing boiler. Its high operating efficiency is made possible by the design of the condensing boiler’s larger – or sometimes dual – heat exchanger.

The heat exchanger makes sure that as much heat as possible is transferred from the boiler’s burner – and as little as possible lost in hot gases through the flue.

There are two types of condensing boiler: regular and combination. Regular condensing boilers heat your hot water through a hot water cylinder, combination condensing boilers give you instant hot water without the need for a cylinder.

Will it save me money?

If everyone in the UK with gas or oil heating installed a high efficiency condensing boiler we would save enough fuel to heat 1.9 million homes a year and reduce CO2 emissions by 6.7 million tonnes

Are there alternatives to high efficiency self condensing boilers?

The traditional gas boiler is still the simplest and most economical for heating in the UK but there are now many alternatives including biomass boilers, ground source heat pumps and solar panels.