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I have an ouside garden tap that freezes every winter, while I am away and the heating is down to 10C, despite a protective insulating cover over the tap on the house wall. Is it safe to wrap the pipe (inside the outer house wall) with a pipe heater wire - one that wraps around the copper pipe? These devices seem to heat up to 70C which seems very high. If so, is it best to maybe just switch it on at night with a timeswitch?
