Combi (Instantaneous) Boilers

Added On: 25/05/2008

2 Ratings

What is a combination (instantaneous, combi) boiler?

A combi (combination) boiler, is a home heating boiler that requires no water storage tank to provide hot water.

Whilst traditional central heating systems usually require a large copper water storage cylinder which is kept in an airing cupboard or a loft, a combi boiler heats the water inside the actual boiler unit, saving you space and energy.

Combi (combination) boilers use less energy than other types of boiler due to their improved heat efficiency, so you'll be able to reduce your bills and your impact on the environment. Energy is saved because the boiler only heats the water that is required, instead of heating an entire tank of water.

There are numerous advantages to combi (combination) boilers such as space-saving and improved efficiency, and their popularity is on the increase in the UK with over half of UK homes now having combi boilers.

Advantages to a combi (combination) boiler

The energy saving design means combi boilers have hugely improved efficiency, making your home a greener place to be. Exhaust gases from the boiler are used to heat the water, unlike other boiler designs, where the exhaust gas is wasted.

Combi boilers give instant hot water from taps and showers at mains pressure, with no need for a water pump.

A combi boiler can help lower your water heating bills due to the energy-efficient design.

Their compact size means that a combi (combination) boiler can be squeezed into those tight spaces, giving you more room in your home.

You also get more room due to the lack of a hot water storage cylinder tank, an added bonus!

Most modern combi (combination) boilers are designed to be easy to service, due to the single location of the boiler, so you can keep those servicing and repair bills down.

Disadvantages to a combi (combination) boiler

Combi (combination) boilers can't provide as good a flow rate as standard water tank boiler designs, especially in winter, and are suitable for smaller homes (ideally 1 to 2 bedrooms).

The hot water delivery is only at it's peak when one source (like a tap) is run on it's own, using 2 sources can cause a drop in flow.

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