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Thanks for that info. The system has been altered and the boiler moved. I am just now trying to rectify this one small problem. I have only noticed it since the weather became warm and the heating was no longer required.

Hi, I am getting hot rads when the boiler is set to supply only hot water to the tank. The electronic valves are working correctly. It appears to be syphoning back through the system on the return to the boiler. Question: can I fit a 22mm non return valve into the return pipe which comes...