Wow! Seems like driving a thumbtack with a sledge hammer! I'm not the heater guy but I do know a bit about solar so I'm wondering what your solar options were and why they failed.
My parents had a 13,000 gallon AG in upstate New York that only got 6 hours of sun per day on the solar panels I installed for them (1 20'x4' and 1 10'x4') and it consistently kept the water, which had been 77/78 degrees, at 84 degrees.
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