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Thanks to all for the replies. I shall replace the thermostat asap, we can use the hot water tank electric element in the meantime. If I cannot fit it myself, I will get a plumber to do it. Thanks again

Hi all, new to this handy site. I have an old gloworm space saver boiler, which has started to overheat the water. Hot tank stat is 50, rad 20 degrees . When running either the radiators or the hot water, or both, the boiler and the circulation pump run continually, until turned off by either...