Technical Information

Not sure what type of boiler you currently have? Read our guidelines below to help you establish what you have. Don't worry if you are still not sure as we will validate this when we visit to conduct our on-site survey.

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What is a Combi Boiler?

How can I tell if I have a combi boiler?

If you have a combi boiler (or combination boiler to give them their full name) you should see five copper pipes coming out of the bottom of your boiler. You’ll also have no external pump or large hot water cylinder in your airing cupboard (if you have one).

If you look in the loft, there should not be any water tanks.

This is the most popular kind of boiler in the UK, and is generally the boiler found in flats or small houses with only one bathroom.

What is a System Boiler?

How can I tell if I have a system boiler?

The easiest way to tell is to check for copper pipes at the bottom of the boiler – a system boiler should have only three as opposed to the combi boiler which has five. As with a combi boiler there is no external pump and no external expansion storage, these are all contained inside the boiler itself.

You will have a hot water cylinder most likely in your airing cupboard. System boilers are sometimes known as sealed systems.

If you look in the loft there a should be a single large water tank.

What is a Regular Open Vented Boiler?

How can I tell if I have a regular boiler?

Often these are referred to as a conventional boilers or open vented boilers.

A regular boiler should have two copper pipes coming out of the top and one coming out of the bottom. Also you will have a hot water cylinder in the airing cupboard.

If you look in the loft you will have a large cold water storage tank, and another smaller header tank.

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