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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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