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 - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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