The questions is enough for what?
A decent Combi boiler will easily be sufficient for most houses and provide it is of a sufficient size will provide plenty of hot water for a shower and other purposes Conventional wisdom would be a system or heat only boiler for houses with more than one bathroom although even this isn't necessarily the case. Problems of insufficient hot water supply only really arise when you want to runs say two showers simultaneously and in reality that doesn't often occur in most households. The advantage of a Combi is that the water never runs cold as it does when you have used up the contents of a hot water cylinder
We were going to have a Combi boiler but were only prevented by having low water pressure
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