I wrap 1/2 string of incandescent mini Christmas lights around the spigot and exposed pipe, then put the cover over it or wrap it in a towel. Bonus is it is easy to see if it is working. I always wonder if the wire heaters are working.
During the 2021 snowstorm, we were below freezing for 100 hours or more going as low as 6*. I pushed a kitchen thermometer between the stone and cover's foam and consistently got 65-70*.
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