The first is capacity. Sediment occupies volume that would otherwise hold hot water, so a tank that once met demand comfortably starts running short earlier than it used to.
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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.
