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i have a dual system when i added the solid fuel stove and pump, the pumping over started. the pump is on the return supply to boiler and the feed & expansion on the flow. i tried turning down pump setting but it only slowed down the pitching. i then connected the feed to the expansion pipe it...

i came across a similar problem. so i solved it by connecting feed pipe to expansion pipe. the problem now is that the water in loft tank gets warm. i presume it is acting as a loop now. i'm worried about the tank maybe melting, or even maybe excessive evaporation causing top up of fresh water...