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ok thanks fully pumped ch and hw boiler keston c 40 (integral pump) gas oldish system with new boiler 1 year thats it i think

help please i have a system that has been working fine but suddenly i find that the system is constantly expanding and i have a constant flow of hot water flowing into the header tank and then back into filling the system. (it is not overflowing from the tank).... preeceding this there was...