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A combi boiler or combination boiler is the most

A combi boiler (or combination boiler) is the most commonly used boiler in the uk as it provides heat for both the central heating system and the hot water system on demand.. as and when you need it. On the other hand, with an old heating system, it is important to do a mechanical flush a mechanical flush involves the process of pumping a chemical into the central heating system to clean it before a combi boiler installation as a result,.

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