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Combi boilers use the mains water

Combi boilers use the mains water pressure to supply both hot water and heating upon demand - this removes the need to have bulky kit like tanks or cylinders, something that is very popular for homes which don't have an abundance of space! Follow your combi boiler user's manual and turn the system back on, then allow the heating to run as usual. Holt was very punctual and easy to work with they did a very clean.

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