Leak detection devices address that gap. The simplest are battery powered sensors placed where water would appear first: under a sink, beside a hot water unit, behind a washing machine, in a laundry. They alarm when they get wet. They cost little and they solve the specific problem of a slow leak running unnoticed in a cupboard.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
