It's called heat pipe theory. You sink a pipe below frost line where gound temperatures are stable and the water will thermosphion with-in the heat pipe keeping the surface free of ice.
Another method is covering one end of the troff with a clear hard plastic then vertical down to just off the bottom. Seal the top edges of the plastic to the tank edge. The sun will solar heat the water and thermosphion the water thru out the tank. Draw back here is it's very easy to over heat the water during the summer time.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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