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I have an old Potterton Kingfisher floor standing boiler. My hot water is gravity fed and my heating is pumped. The problem I have is there is a loud "clunk clunk" noise from somewhere (sounds like from a pipe). This noise occurs when the HW only is on, and when it gets to a certain...

Hi, Can somebody tell me whether the central heating radiators are under pressure when the system comprises of an unvented cylinder, like a megaflow, or is it separate? Many thanks in advance.