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I had a similar problem. Mine was finally diagnosed as a corroded heat exchanger pipe, the coil that sits inside the cylinder and through which the heated water from the boiler circulates. This failure enabled a path between the normally closed system and the open system, the pump forcing the...

Thanks for the info. I am installing a 3 bar Salamander ESP100 shower pump. The pump will be protected with the Water Starvation Detector, which detects low water level in the expansion tank and turns off the pump. So I am not worried about the tank draining. I am however mindful of the fact...

I want to fit a non return valve in the expansion pipe to stop my mega shower pump draining the expansion pipe instead of draining the tank. Yes I know i shd have fitted a surrey flange or essex doohdah...but my cylinder is a glass lined Lennox water heater and doing any such thing is strictly...