Water stored in a hot water system is deliberately kept hot enough to suppress bacterial growth in the tank. That temperature is higher than is safe to deliver directly to a bathroom outlet. The device that resolves this is a tempering valve or a thermostatic mixing valve, which blends hot and cold to limit what reaches the tap.
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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.
