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Yes those are the types of valves that are fitted. Im a car mechanic to trade so the multimeter isn't an issue, it was more how to go about checking them and if it was easy enough. The valves have on them "for replacement part use 40003916-001" so im thinking the head might be able to be...

Hi all, I know this might have asked/answered already but I couldn't find it. We recently discovered that we don't have any hot water unless the heating is on. We have a gravity fed system with 2 water tanks in the loft. 1 large one filled with cold water and a smaller one. A hot water tank in...