No external pump no tanks no external expansion vessel no motorised valves and in many cases item 6 is not needed either. Sealed central heating system layout the sealed system uses a collection of parts to allow the system to do away with the feed and expansion cistern header tank. Nb not to be confused with vented and unvented hot water tanks which are explained in our guide to hot water cylinders many homes in the uk still have an open vented heating system and in some cases they are the better option for your home.
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