Combi Boiler Guide
Combi – short for "combination" – boilers are the most popular form of boiler in the United Kingdom, accounting for more than 50% of new condensing boiler sales. A combi boiler is, as the name suggests, a highly efficient water heater and central heating boiler combined in a single unit.
Water is heated on demand from within the unit itself, so a combi boiler (unlike a conventional boiler -- which typically requires a copper cylinder in an airing cupboard or elsewhere to store hot water) can be a practical solution if space within your home is at a premium. Combi boilers are typically compact; they can be hung conveniently on a kitchen wall, for example ; and their installation is less disruptive and less expensive than that of conventional boilers.
The absence of a storage cylinder means that significant savings on water heating can be made. Although the rate at which hot water is produced may be slightly slower than with a conventional boiler, hot water is nevertheless delivered through your taps or shower head at mains pressure. This may mean that you can enjoy a high pressure "power" shower without the need for an additional pump.
A condensing combi gas boiler is a popular option, adding extra efficiency to the – already not insignificant – benefits of a standard combi boiler. A condensing combi boiler can be installed in exactly the same way as its standard counterpart and can thus be a direct replacement for an existing boiler if desired.
UPDATE: The UK Government recently announced plans to introduce a boiler scrappage scheme. The rebate will apply to older inefficient 'G' Rated boilers. More information about the scheme can be found at our sister site Boiler Guide on the Boiler Scrappage page.
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