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I really hope I’ve misunderstood but you are saying your hot and cold mix before they reach the kitchen?? Hopefully that is via a tmv and not appalling piping??Due to the nature of the fittings it is not possible to isolate. (Builder was not the best - always cutting corners.)
There are isolating valves in the kitchen - but nowhere else. Not even in the bathroom sinks. And due to the nature of the shower mixer valves, we can remove the cartridges - but can't actually shut them off.
I guess my question is: "Do you think the most likely situation is that one of the mixer valves is the culprit?" - Because if that is the case I think I can identify which one based on the way the pipes flow.
In other words - The cold and hot have already mixed by the time they get to the kitchen and there are only 2 taps between the tank and the kitchen.
Again - many thanks.
The only way you are going to know for sure is to fit iso valves. I wouldn’t want to be changing taps on guess work