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Thread: What should the flow rate be for my gas heater?

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    What should the flow rate be for my gas heater?

    We've decided to have a pool party in 24 hours, and my pool currently sits at 62 degrees. I'm turning on the gas heater now (Pentair MasterTemp) and just realized I have no idea how fast I should be pumping water through it. I checked the manual and it said 30GPM was the minimum. How do I know what's optimal?

    Thanks for any help you can provide.

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    Re: What should the flow rate be for my gas heater?

    What size BTU heater is it, 250,000 or 400,000? Heaters have to have a minimum of the 30GPM or it will not fire. Also, What temperature are you trying to get the pool to?
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: What should the flow rate be for my gas heater?

    MasterTemp 300, which I believe is 300,000. Currently my flow rate is slightly above 30 GPM. I'm trying to get the pool to 80-82˚. Estimated pool size is 36,000 gallons. Air temp today and tomorrow will hit a high of 81˚.

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    Re: What should the flow rate be for my gas heater?

    You will get about 1 degree per hour of heat into the pool.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: What should the flow rate be for my gas heater?

    I believe generally you want the flow rate as high as possible for maximum energy transfer.

    My knowledge is on the solar side, but I think the fundamentals in this case are the same.

    Fayetteville, NY -17K gal, IG vinyl, Hayward SP2300VSP Max-Flo Variable Speed Pump, FlowVis Flow Meter, Sand filter
    Self designed Arduino powered automation for pump and solar control, Solar Attic Pool Heater, AutoPilot Digital SWG, TF100

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    JasonLion's Avatar
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    Re: What should the flow rate be for my gas heater?

    peterdaly, What you said applies to a solar panel, but it doesn't make very much difference in a typical gas pool heater. They normally regulate the flow through the heat exchanger internally to maintain it right around the optimum flow (and bypass the rest around the heat exchanger).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    peterdaly's Avatar
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    Re: What should the flow rate be for my gas heater?

    Interesting. Thank you Jason.

    Fayetteville, NY -17K gal, IG vinyl, Hayward SP2300VSP Max-Flo Variable Speed Pump, FlowVis Flow Meter, Sand filter
    Self designed Arduino powered automation for pump and solar control, Solar Attic Pool Heater, AutoPilot Digital SWG, TF100

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