So who is right as one website contradicts the other
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where's the catch? Because it is heated on demand the hot water runs more slowly so, for example, it takes longer to fill a bath
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big advantage with a combination boiler, or a "combi" as it is usually called, is that it not only delivers continuous hot water, but more importantly delivers it at mains pressure too. So, with a combi system you can have a really effective shower without needing an expensive "Power Shower" booster pump.