The Heat Only/Gas Boiler

These boilers are also known as the traditional or gas boilers. The big advantage with these traditional boilers is that multiple hot water faucets can be run at the same time, meaning there is no loss of pressure for hot water users. One thing to keep in mind with these boilers though, is that once the hot water is used up you will have to wait for it to refill. So the size of the cylinder you choose will depend on how much hot water you expect to use.

The heat only boiler provides heat for your central heating (radiators or underfloor heating) as well as supplying the cylinder. This type of boiler is generally larger than the combi boiler, plus the extra room taken up by the cylinders. However these are normally situated in the loft or attic where the space they take up isn’t being used anyway.

The System Boiler

The system boiler is similar in many ways to the traditional/heat-only boiler, although these type of boilers are slightly easier to install because many components are pre-built in to the boiler removing the need for a expansion tank or supply feed.

A big advantage with these boilers is that an electric water heater can be added to the hot water cylinder so that hot water can be maintained even during times when the boiler is ‘offline.’ The electric water heater can also be used to generate hot water quickly or at times that haven’t been programmed.

With this boiler there is also no need for you to have a loft-sited cold water tank for those with a mains supplied hot water tank, freeing up a little extra space in the loft.