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Thread: most effective way for solar cover to heat inground ppol

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    Join Date
    Apr 2011
    Location
    Lincolnton, NC
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    20

    Question most effective way for solar cover to heat inground ppol

    Hi guys,

    I have a 23,000'ish gallon in ground oval pool & recently replaced my solar cover this year with a brand new cover. I have had the cover on for about 4 weeks 24/7, & the water temp is still in the mid 70's. My friend also has a solar cover on his in ground pool, & his water temp is high 80s. I should mention we live in NC.

    My first year with the pool, when I had my first solar cover on, the pool water heated up very quickly to the mid 90s & felt like bath water; it was awesome. The only differences between that first year & this year are that I ran the filter 24/7 the first summer & it was freshwater cleaned by chlorine. I have converted to saltwater now, & run the filter on a timer, 4 hours on, 4 hours off. My friend, who has the pool with water temps a lot higher than mine, also has a saltwater pool, but runs his 24/7.

    My question is, is my running 4 hours on, 4 hours off, the reason my temps are not rising? That is the only difference between my 1st year & this year, & my friends pool & mine, that I think may make a difference. My theory is, during the 4 hours off, the top few inches of water get heated up by the sun. Then when the filter turns on for the next 4 hours, it circulates all of that colder water underneath with the few inches of warm water on top, thus cooling that warm top water. Therefore, it never really gets warm. If I ran the filter 24/7 for a few weeks, the sun would penetrate the cover & heat the constantly circulating water, thus heating all of the water rather than just the top few inches. May heat more slowly, but it would heat throughout the entire pool, rather than just the top few inches.

    Does my theory sound correct, or am I going mad?

    Thanks for any help in advance!
    25,000 gal in-ground pool (vinyl liner), Hayward Pro Series High Rate Sand Filter Model #: S-220T, Pentair Dynamo Pump

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    Casey's Avatar
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    Apr 2007
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    SW PA
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    Re: most effective way for solar cover to heat inground ppol

    I think it is more effective to heat the pool by removing the cover, having the pump shut off and letting the sun beat down on the pool and covering at night.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Join Date
    Apr 2011
    Location
    Lincolnton, NC
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    Re: most effective way for solar cover to heat inground ppol

    I have been trying that too, & nothing seems to heat the pool like it did the first summer I owned my house.
    25,000 gal in-ground pool (vinyl liner), Hayward Pro Series High Rate Sand Filter Model #: S-220T, Pentair Dynamo Pump

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    Mod Squad jblizzle's Avatar
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    May 2010
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    Tucson, AZ
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    37,389

    Re: most effective way for solar cover to heat inground ppol

    The running of the pump has nothing to do with the amount of heat energy the pool sees from the sun (with the cover off). With the pump off, the upper part of the pool will get warmer than the bottom. With the pump on, this heat is mixed throughout the pool.

    Now with a cover on during the day (which may not be optimal), you are likely right that with the pump off the cover is getting hot and heating up the top of the water and you are likely losing some of the heat back to the air and not getting it transmitted to the pool water.

    If you have no wind and not very low humidity, the sun should heat the pool more without a cover during the day, but you will want the cover on at night to retain the heat.

    If you are going to leave the cover on, I would suggest just doing all your pump running during the hottest part of the day and not run the pump at all at night.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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