As the daytime temps go below 70 accompanied by night time temps in 50 or less.......the differential between the morning temp and the pool water temp will start approaching a point where there is not enough heat in the sun or hours in the day and the gas unable to run long enough to meet the preferred temps in the 80's.
All dependent on size of the pool, how many solar panels and btu capacity of the heater.
The bigger the differential, the more the heater runs and the $$$ meter spins pretty fast.....
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