A condensing boiler or high efficiency boiler as it is also known maximises the heat the boiler generates by recovering some of the lost energy, which would normally be lost through the flue.
A condensing boiler is around 30% more efficient than a standard boiler because it uses the residual heat that would normally be lost through the flue to heat the latter part of the heat exchanger. The word condensing is used because the boiler reduces the residual heat temperature enough that it cools to water vapour or condensation, allowing the condensing boiler to transfer the heat left in the condense to useful energy.
A condensing boiler can on average save you 30% of your energy usage. Legislation that came into force in 2005 now requires that any new domestic gas appliance is a condensing boiler. A simple way to ensure the boiler is a condensing boiler is to check its SEDBUK band; it should be SEDBUK band A.
There are three main types of condensing boilers:
Combi Boilers or Combination Boilers
A Combi Boiler, also known as a combination boiler provides heat for central heating and domestic hot water upon demand. With a combi boiler heating system you do not require feed and expansion tanks in your loft space or a water cylinder, therefore saving space. Read more here >>
Open Vent Boilers
An open vent boiler is a boiler that is installed on an open vent central heating system, the term open vent, relates to the heating system being open to atmospheric pressure, as major components to an open vent system includes feed and expansion tanks in the loft space. Read more here >>
A system boiler is a boiler that is installed on a sealed central heating system, as the word suggests it is not open to atmospheric pressure. In this type of heating system, a system boiler connects to an unvented cylinder that provides the domestic hot water and central heating. Read more here >>