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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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