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This would depend to a great degree (pardon the pun) on the size of the pool and the BTU rating of the heater. However, I have an 18' X 36' pool (about 25,000 Imperial gallons) and my gas heater raises the temperature at a rate of about 1/2 degree per hour.

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This is not really an answer but will maybe give you some more info. Say current pool temp = 60 degrees - it takes my 10k gallon pool about 12 hours to come from completely too cold to swim to a nice baby's bath. Gas heater.

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โˆ™ 2010-12-21 13:37:19
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Q: How long does it take to heat a pool with a pool heater?
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