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Hi, My ideal isar boiler has developed a fault where the domestic hot water cycles between hot and tepid, damned annoying when in the shower. My guess is that it is one of the thermistors, but not sure which one. Anyone any thoughts? Dave[code:1][/code:1]

I need to either replace or fit an external pressure vessel to my boiler. As the internal PV is fitted in the rear of the boiler and would require removing it from the wall, I am opting to fit a new one external to the boiler in the return pipe. Two questions: How near to the boiler does...