Summary: Combination boiler guide, advantages of a combination boiler and disadvantages of a combination boiler.
A combination boiler or combi-boiler is a particular type of condensing boiler. They are the most popular type of system as they combine the ability to heat the domestic hot water (DHW), which is the hot tap water system and central heating from the same location. When DHW is run, the boiler stops pumping water to the central heating circuit and diverts all the boilers power to instantly heating the DHW. Because it gives priority to the DHW, instant heated water is still provided in the same way it would if it had its own system.
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