What is a high efficiency condensing boiler?

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 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.

Please bear in mind that not all home heating systems will be compatible with a combination boiler. A qualified installer will tell you which type of condensing boiler, regular or combination, is most suitable for your home.

Is your boiler energy efficient?

If it's 10-15 years old then it probably isn't. Replacing your old boiler with a new condensing boiler can save you around a third on your heating bills straight away.

Around 60% of CO₂ emissions from your home are down to your boiler. With an efficient new boiler you could save up to 875kg of CO₂ and £130 a year.

Add in a full set of heating controls as well as a new boiler, and you could increase the total savings to around £250 and 1.7 tonnes of CO₂ a year.

Save a third on your heating bills by replacing your boiler

Condensing boilers can be easily fitted to most new and old heating systems, ask your installer for more details.

Did you know?

If everyone in the UK with gas central heating installed a high efficiency condensing boiler, we would save enough energy to heat 3.3 million homes for a whole year and save around 12.5 million tonnes of CO_2.

Savings assumptions