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What is a system boiler

  A system boiler heats your central heating system directly and produces hot water for your cylinder.

An example of a central heating and hot water system layout using a system boiler with an open-vented hot water cylinder:


An example of a central heating and hot water system layout using a system boiler with a pressurised unvented hot water cylinder:


A system boiler, just like a regular (conventional) boiler works on the principle of stored hot water.  However, a system boiler differs from a regular boiler in some important respects.

Firstly, many of the major individual components of the heating and hot water system are built into a system boiler, which means that installation is quicker, neater, easier and more efficient.

Secondly, the hot water is pumped from the system boiler through the heating system to the radiators and hot water cylinder, resulting in a fast response and more economical running costs. The system boiler removes the need for a feed and expansion cistern


What is a combi boiler

A combi boiler provides heating and hot water directly from the boiler.

Here’s an example of a central heating and hot water system layout using a combi boiler: 

A combi (or combination) boiler is an ingenious space-saving idea, and an increasingly popular choice in UK homes. In fact, combis now account for well over half of all the new domestic boilers installed in Britain every year.

A combi boiler is both a high-efficiency water heater and a central heating boiler, combined (hence the name) within one compact unit. Therefore, no separate hot water cylinder is required, offering space saving within the property.

Further benefits of a combi boiler are significant savings on hot water costs and the fact that hot water is delivered through your taps or shower at mains pressure. So you can enjoy powerful showering* without the need for a pump.

Another combi boiler benefit is that it can generally save you money on installation time and costs, since no tank in the roof space means less pipe work and a shorter installation time

Generally ,Combi boilers  are more suited for small to medium homes with 1 bathroom


What is a regular boiler?

Regular boilers heat your central heating system directly and produce hot water for your cylinder.

Here’s an example of a central heating and hot water system layout using a regular boiler:

If you are replacing an older model of boiler, the chances are that you will have a regular (also known as ‘conventional’) boiler.

A typical regular boiler system incorporates a boiler, extended controls, a hot water cylinder which is often fed by a cold water storage cistern located in the loft and a feed and expansion cistern - also located in the loft.


Condensing Boilers

  • The term ‘condensing boiler’ refers to the fact that the boilers produce condense from time to time.
  • Condensing boilers use heat from exhaust gases that would normally be released into the atmosphere through the flue. To use this latent heat, the water vapour from the exhaust gas is turned into liquid condensate.
  • In order to make the most of the latent heat within the condensate, condensing boilers use a larger heat exchanger, or sometimes a secondary heat exchanger.
  • Due to this process, a condensing boiler is able to extract more heat from the fuel it uses than a standard efficiency boiler. It also means that less heat is lost through the flue gases.


"A" Rated Boilers

SEDBUK-scale100% Gas only install condensing boilers that are at least 90% energy efficient, meaning that they turn 90% of the fuel they use into heat.

The official rating for boiler efficiency is the ‘SEDBUK’ scale. SEDBUK stands for ‘Seasonal Efficiency of a Domestic Boiler in the UK’.

‘A’ rated condensing boilers achieve the highest possible efficiency category – SEDBUK Band ‘A’

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