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I don't believe the tanks are heated but there is an attempt to keep them insulated. In the past they would put them under the trailers and exposed to the elements and would freeze very quickly.
Where, pray tell, are you located right now?
Nowadays, they are installed above an insulation barrier as close to the center of the coach as possible, under the coach. If you look under the rig you will see a black plastic-like cover and that cover has a thin layer of material on the inside that is supposed to help with insulation. The hope was that the interior of the coach when being used might provide some heat and prevent freezing. But several days of -3 weather would pretty much freeze anything. And there are still less expensive units still made without any insulation. So much for the Arctic Package, huh?
I hope things warm up for you pretty quick.
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