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Types of Heating Systems & Boilers

What is a combination boiler?
A combination 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 combination boiler:

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A combi (or combination) boiler is an ingenious space-saving idea, and an increasingly popular choice in UK homes. Combination boilers 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.

Advantages 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 advantage 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.

*a thermostatically-controlled shower safeguards against sudden changes in water temperature.

What is a regular (conventional) 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:

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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.

What is a system boiler?
A system boiler heats your central heating system directly and produces hot water for your cylinder.

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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, although a system boiler differs from a regular boiler in some important respects.

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

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.


CM3 Gas Ltd, 270 Southend Arterial Road, Hornchurch, Essex, RM11 2SG
Telephone: 01708-474151 - 01245-328862 - 07983404676 - Fax: 01708-474151
Email: enquiries@cm3gas.com | Registered Company No: 05583152 | VAT No: 867497458 | Website: Compass SEO Services