Assuming the panel isn't going to be very far over the tank you won't need a very big circulation pump. They make solar powered pumps with a small solar panel for not huge money.
You can make a solar water heater yourself, get a 4x8 sheet of plywood or waferboard, paint it black (coat with fiberglass resin first and it'll last a long time) then put a big coil of black plastic pipe onto it. To secure the pipe drill holes through the board and zip tie it down. Its not the most efficient heater but much less money than the alternatives. If you make it level with the tank and can put the board mostly level you could even have it thermosyphon and not need a pump...
The worry of course is that a small leak of anti-freeze into the water will kill whatever is drinking it.
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Today's Featured Article - Women and Tractors - by Teri Burkholder. The View from the Garage - Never a doubt, everything on our farm is a learning experience. I've been working very hard to get our two rundown Farmall A's sanded, primed , bondo�d, fiberglassed and painted before our big local tractor show called the Tulip Festival. My husband Ben came in the garage one rainy day to see if he could "help". Well if you knew Ben you wouldn't want him anywhere near your spray gun, fiberglass or bondo! So I pulled out the 2 old yucky looking magne
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