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What type of boiler do I have?

To make sure you select the right cover for your boiler, read our descriptions of the various boiler types below.


Boiler and heating systems cover

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Conventional boiler fitted pre 1/4/2005 

This typically includes a boiler and extended controls, a feed and expansion cistern and heats the domestic hot water which it stores in a hot water cylinder (usually found in the airing cupboard). It is often fed by a cold water storage tank located in the loft. The boiler is controlled by a timer/ programmer to work at pre-set times, although there will also be a manual override button to turn the boiler on when the hot water cylinder needs more hot water in between the pre-set times (often called an emersion heater.)

Condensing conventional boiler - fitted after 1/4/2005

Since 1st April 2005, by law, all new conventional boilers must be condensing boilers.

This is a new type of boiler that uses the heat trapped in the condensation that used to go out of the flue as steam vapour. By condensing this hot moisture, the hot condensed liquid is used to help heat the water passing through the boiler. This makes the boiler more energy efficient.

This type of boiler typically includes a boiler and extended controls, a feed and expansion cistern and heats the domestic hot water which it stores in a hot water cylinder (usually in the airing cupboard). It is often fed by a cold water storage tank located in the loft. The boiler is controlled by a timer/ programmer to work at pre-set times although there will also be a manual override button to turn on the boiler when the hot water cylinder needs more hot water in between the pre-set times (often called the emersion heater).

Combi/ combination boiler

This is the most popular type of boiler in the UK, it provides heat and hot water without the need for water tanks or cylinders. Heated water goes straight from the boiler to the tap.

Since 1st April 2005, by law, all new combination boilers must also be condensing boilers and may be called a combination condensing boiler. The term combination means it is the type of boiler that comes on when you turn on the tap (or your timer turns on the central heating), and condensing means it uses the condensation trapped in the exhaust to help heat the water.

Combined cooker/ boiler

An appliance that serves both as a heat source and/or heats water and a cooking appliance, for example a twin burner, Range Cooker, Rayburn or Aga.

Boiler and heating systems cover

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