Well, my greenhouse did have a lot of snow around and on it last winter, so it might be me you were thinking of.
I have to put insulation around and over the tank and add a bit of heat to the water with a clamp lamp and an incandescent bulb above the water to keep the water from freezing in the colder part of the winter.
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I expect you explained all this last year, when you moved them, but I still find it wonderful this simple system works so well!