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IF the hot water worked...
My guess is the pipe after the pump, feeding the cold water faucets froze.
In the diagram it would be the first junction after the pump feeding the cold water faucets.
In the winter, I keep a 120vac 75W battery warmer plugged in, in the forward battery compartment to keep my lithium batteries warm.
I also put one in the basement to keep the chill out of the basement.
When it really gets cold I put a small plug in 350W ceramic heater in the basement blowing towards the convenience center. I move the battery heater in the basement to the forward compartment so there are two in there to keep the batteries warm.
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