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I have a constant overflow coming from header tank, the water is hot. As a result of advice from several engineers I just changed the cylinder fearing the coil had broken causing cold and hot water to mix. This is obviously not the case now as water is still leaking. I have a baxi bermuda...

I have a baxi bermuda back boiler. Cylinder hot water tank upstairs and the header tank above this. For some reason warm water is slowly seeping back up the pipe from the cyliner back into the header tank, this is then causing the overflow to constantly run and eventual loss of hot water...