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I have a thermal store system where the mains pressured water is forced into the coil of the hot tank and is heated by the surrounding water. Then it is blended and to the taps and shower.The boiler is working ok and the tank gets hot to touch. I recently changed the blending valve but still the...

I have a thermal store system about ten years old. About two weeks ago the hot water went luke warm & the flow was poor. The central heating system is ok. The hot water is derived from mains pressure which is reduced by a diaphragm reducer, then double check valve, then through a coil in the...