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I should add that when I turn a hot tap on and I get some flow which then fades to a very weak flow and then if I turn the tap off and leave for an hour or more and the same thing happens would suggest a partial blockage. If there was an air lock would I get any flow at all other than air...

Presumably any hot tap that isn't working would do to push air back with the hose. There are 6 around the house all bar one is a mixer tap. I turned the boiler off completely. Can the heating be turned on and not the hot water or is it better to leave both off until solved. And if puffing on a...

Have a header tank and hot water tank. Turned off cold mains in and drained both as wanted to fit isolation values in downstairs toilet. There was no apparent isolation value on the hot tank out. Did job and turned mains cold back on header tank fills but hot water tanks doesn't (provides a...