At 30 degree air temps, even with a solar cover, you will lose 10 degrees in one night, two at most.Originally Posted by BillRussell51
To raise 52,000 pounds of water 10 degrees, it will take 520,000 BTU. Thats a lot of BTU for what your describing. I dont think you will generate anywhere near that. For your small pool, you could get a 400,000 BTU gas heater and heat that pool very easily. For propane, that 10 degree rise would cost around $13. For natural gas, maybe half that.