Insulated stock water tank?
I had an idea and was wondering if anyone had good input or advice. I'm wondering how hard it would be to insulate a stock water tank so it won't freeze in the winter. It doesn't normally get any colder than 10 degrees here in the winter. I was thinking of setting the tank on a piece of insulating styrene board, then framing the whole thing with plywood, leaving maybe a 1-2" gap between the wood and the tank, then filling the whole thing with Great Stuff expanding foam. I thought then perhaps I'd paint the plywood black to attract more sun, and probably cover part of the tank with either plexiglass or black-painted plywood so the entire surface wouldn't be exposed to the air. What do you think? Would it work? Anyone have any better ideas? The field is too far to run an electric heater.