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Thread: Heating pool with out solar panels or a heater.

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    Join Date
    May 2014
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    Heating pool with out solar panels or a heater.

    So i've been experimenting with how to heat your pool just with the sun. I tried a number of different scenarios and this is the one that worked the best for me.

    I go out in the morning around 7am and remove the solar cover. Turn the pump off and let the sun heat it all day. Put the cover back on before bed and turn the pump on and let it filter for 4 or 5 hours.

    This increased my temp in my pool ~3 degrees each day i did this. When i left the pump running during the day, i only got about 1 1/2 degree increase. And when i left the cover on, i barely got 1 degree increase.

    I have to thermometers in my pool. One is a floater and one sits about 2' down. At night, both read a constant 82 degrees. After the method above, the floater read 94 and the other ready 83. When we went swimming and stirred everything up and got all the hot spots out, both read 85/86ish. The sun heated up the top 6 or 8 " of water rather quickly throughout the day. The next day, i had lost a few degrees overnight. Both read 83. I did the same thing again and after stirring up the pool again, both read 87.

    And my tests go along with what most ppl on here say. Cover off during the day, on during the night. I just found it works best when the pump isnt running during the day.

    Same tests also showed the best results in my in-laws pool as well.
    24'x54" 15k AG round - Outback Genesis
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    bobodaclown's Avatar
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    Re: Heating pool with out solar panels or a heater.

    ahhh, You have a solar blanket/cover. That reduces the evaporation cooling that happens during the evening. Gain during the day, reducing the cooling during the night.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Mod Squad pooldv's Avatar
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    Re: Heating pool with out solar panels or a heater.

    Good info! Thanks!
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Makdaddy's Avatar
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    Re: Heating pool with out solar panels or a heater.

    I may try this
    Going to go turn the pump off now
    --- Greg----
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    Re: Heating pool with out solar panels or a heater.

    I would think that water motion during the day would help warm the pool. I run my pump in the day time thinking that it would help. It should help if the air temp is higher than the water temp. From a physics point I can't see how running the pump during the day wouldn't help warm the water. If your top layer of water is warm then the heat transfer from the air will be less. Also the top layer will evaporate more the warmer that it is. I am confused.

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    Re: Heating pool with out solar panels or a heater.

    I dont know why it works for me, but i tried it with and without the pump on, with and without the cover on and countless other ways over the past 2 weeks.

    This is the way that seemed to work best for me. Hey, if it gets me through another year with out having to buy a heater, i'll be happy. I know a heater is in my future, but i didnt really want to buy one this year. So far, the pool has stayed above 84 for the most part since i've been doing this....compared to 78-82 when not doing it.
    24'x54" 15k AG round - Outback Genesis
    1 1/2hp Hayward Matrix 2 speed. Hayward 180T Sand Filter
    TF-100 Test Kit
    Pool School & TF-100
    How to SLAM

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