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Kind of a complex situation. Using gas water heater as a boiler for an old cast iron radiator. In addition we added a recirculation pump. Everything was working fine but then we had leaking from water heater pressure valve.

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    That means either the water is too hot, or the pressure is too high. Do you have an expansion tank, or other pressure controlling device? When you heat water in a closed loop the pressure goes up, if it gets to high the T&P valve will open. – Tester101 Oct 19 '14 at 4:38

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