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  • Yeah I don't trust the workmanship of the builders who renovated the place before we bought it (eg, when one of the toilets flushes the boiler starts up - so it's fed from a hot pipe). I'd rather try and detect the cables somehow and be sure.

  • More likely that you need a one way check valve between bog and boiler than it being plumbed to hot.

  • You want a stud / wire detector - google, black and decker do a decent one for 18 quid but prob can get cheaper ones

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