here comes the cold
Here's an old trick; set up a 25w light bulb into the shallow well pump closet or shed or container or whatever and drain out the cabin water down to just above the pump but not low enough to lose the prime. A frozen pipe is not all that big a deal depending... A frozen trap in an inaccesible crawl-space is a big problem.
Also, high pressure black plastic tubing can withstand the 10% expansion of freezing water without breaking.
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