A regular boiler is more efficient than a combi at producing hot water in the first place, but then some heat is lost from the hot water cylinder, so a combi may be more efficient overall. The best option for you will depend on a number of factors: How much hot water do you use? A large family using lots of hot water could be better off with a regular boiler – a smaller household using less may be better off with a combi. short of space? combi boilers dont need a hot water cylinder, and so need less space. Are you thinking of installing solar water heating? Something to consider - Many combi boilers are not compatible with solar water heating or cannot use it so effectively.
