What comes out first is the water already sitting in the pipe between the unit and the tap, which has cooled since it was last used. The further the outlet is from the hot water system, the more cooled water there is to clear before hot water arrives. That volume goes down the drain every time.
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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.
