What are they?

Boilers generate hot water primarily for heating your home and most also provide hot water for taps and showers.

What types of boilers are there?

Regular boilers (or “heat only” boilers) are part of a traditional heating system, with one circuit feeding the hot water system and a second circuit providing heat to a hot water cylinder in an airing cupboard.  Best option for larger families with high hot water demand.

Combination (or “combi” boilers) provide heat to a central heating system in the same way as a regular boiler but generate hot water on-demand and provide it directly to taps and showers.  Combi boilers do away with the need for a hot water cylinder. Best for smaller households.

Some combi boilers have a small amount of hot water storage built in so that piping hot water is available more quickly without having to wait for the boiler to heat up.

Old boilers (more than 10 years old) can be very inefficient, wasting up to 45% of their heat out of the flue (exhaust pipe).  New condensing boilers are around 90% efficient and an upgrade is well worth considering if you have an old boiler as you may cut your energy bills by one-third.

Costs and savings

New boilers cost around £1000, however once installation costs are considered the overall cost of replacing a boiler rises to around £1500-£2500, depending on whether the boiler needs to be moved to a new position for example. Typical annual savings are shown below.


WinACC - Boilers - L1.pdf120.26 KB