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i have a problem with a cold water central heating header tank that is over flowing when the central heating is on, i think the water is coming back up the pipe which feeds the central heating system, any ideas to rectify this problem :?

thanks for that but there's no isolating valves fitted, there is a little water to start with but then it just stops running

i have a cylinder full of water, tank in loft full of water, but no water coming out of taps?