It got well below freezing
last night without affecting either water line.
That's big news for us and
might indicate an end to breaking a
hole in the top layer of ice on the storage tank when we need water on cold days.
The insulated box that goes
from the ground to the trailer has a small door so we can access the
water hose spigot when needed.
Doc --- We'll have to wait and see. We don't tend to get single digits for extended periods around here --- just a smattering of nights like that scattered through the winter. Our usual lows are more in the twenties and sometimes teens even in the dead of winter.
Mark's box like this worked great beside the water tank despite that cold, but it's also lying along top of the earth, which has a mitigating impact. So, we'll have to wait and see....
The good news is, the line is very accessible if it freezes and bursts (and it doesn't seem to really burst --- we've been letting the same line freeze up for a couple of winters and it usually just freezes and thaws.)