I've got the exact same size pool in Northern NJ and have an 85,000 BTU/Hr heat pump. I have had it for 10 years with no problems. A heatpump won't give you the fast initial heatup that you can get with a gas heater of much higher output, but once you have it to temp it will keep it there for a much lower cost. Make sure to use a solar cover no matter what heater you use. A pool with a solar cover on when not being used will cost 1/5th the amount to heat over a season versus one without a cover.
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