Ever wonder why the oceans don't freeze from the bottom up? After all, it's a lot colder at the bottom of the ocean than at the surface. It's because water is one of the very few substances that expand when they freeze.
So you're assuming that the warmer water at the bottom of the tank will keep the surface from freezing, because as the water cools it will descend from the top to the bottom. That works until you get down to around 39 degrees F, when water reaches its maximum density. Once water gets colder than 39F, it starts to expand, so now the colder water rises to the top of the tank, where it just gets colder.
So, no, I don't think your idea will work. But give it a shot and let us know how it turns out.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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