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    In the 2014/15 report and for the fourth year running the entire range of Worcester Greenstar gas boilers have been awarded Which? Best Buy, the only boiler manufacturer to have been awarded Best Buy status*.

    Find information on Greenstar gas boilers below, or, use our Find a Boiler search to see which is the best boiler to suit your needs.

    Find a gas boiler

    *Which? annual boiler report September 2014

     

    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:

    Combi boiler layout Enlarge image

    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 includes hot water being 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.



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

    What is a regular boiler?

    Regular boilers (also known as ‘conventional’ 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:

    Regular Boiler system Enlarge image

    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.

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

    System boiler layout Enlarge image

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

    System layout unvented Enlarge image

    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.

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