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Thread: Heated Water temp ?

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    Heated Water temp ?

    Greetings--

    I'm curious-- what temp diferental should I expect to see between the pool water and the heated water coming out of the jet ?
    - Reji

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    Join Date
    Apr 2007
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    Ft Lauderdale, Florida
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    Under normal operating conditions,

    Gas Heaters should show a 5-9 degree split
    Heat Pumps should show 2-5 degree split.
    Sean Assam - Sean@teamhorner.com
    National Accounts and Commercial Products Manager
    AquaCal Heat Pumps www.aquacal.com
    AutoPilot Salt Chlorine Generators www.autopilot.com

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    mas985's Avatar
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    May 2007
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    Depends on the BTU rating of the heater and flow rate in the pipe.

    Degrees Rise = BTU Rating * Heater Efficiency / (60 * GPM * 8.34)

    If you need help with GPM, let me know.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Quote Originally Posted by mas985
    Depends on the BTU rating of the heater and flow rate in the pipe.

    Degrees Rise = BTU Rating * Heater Efficiency / (60 * GPM * 8.34)

    If you need help with GPM, let me know.

    AGHHHH!! Mathmatics......

    Where would one find the Heater Efficency variable ?
    Attached Files Attached Files
    - Reji

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    mas985's Avatar
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    It should be listed in the manual or you can look it up on the web. If you cannot find a reference then just use 80%. It is probably close enough.

    GPM can be approximated as well by the pump's head curve. You can pick somewhere in the middle just to get an idea of the numbers you are dealing with. Another good approximation for head loss is about 3 times the filter PSI reading. Then look up the GPM on the head curve of the pump.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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