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Thread: Gas heater for saltwater pools? And size heater needed?

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    Join Date
    Apr 2015
    Waterford, MI

    Gas heater for saltwater pools? And size heater needed?

    What type of heater should we be looking for with a saltwater pool?

    What size should we be looking for? About 15,000g AG in Michigan.

    I found a possibly 1yr old used Jandy Lite2 for $500. Not sure on the size yet the lady is going to get back with me when she finds out. From a quick google search these Lite2 use a copper heat exchanger.

    Any advice would be appreciated. tnx.
    Michigan - 24'x54" AG, approx 15,000g, 2 center drains, Cartridge filter, Aqua Pro 2hp, 2 speed pump 3.5a@1725w / 10.5a@3450w, AquaCal TropiCal T90 heat pump, Hayward Salt & Swim SWG, Poolskim, Aquabot Rover Jr.

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    JoyfulNoise's Avatar
    Join Date
    May 2015
    Tucson, AZ

    Gas heater for saltwater pools? And size heater needed?

    The best material for a heat exchanger is titanium but you'll either pay through the nose for it or it will be hard to find. Second best is a cupro-nickel alloy. Copper is your basic standard heat exchanger.

    As for size, it depends a lot on your water temperature and what you're trying to achieve. I have a 400,000 BTU/hr heater for my 650 gallon attached spa which works great but I rarely use it for the 16k gal pool since I don't use a pool cover. If you're going to heat your pool when it gets cold, then you're definitely going to need a good bubble cover to retain the heat or else evaporative heat losses will dominate.

    Are the walls of your AGP insulated?

    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    TFP Guide

    Join Date
    Jun 2012
    western NY

    Re: Gas heater for saltwater pools? And size heater needed?

    At a minimum, you would need a 300,000 BTU heater to achieve a 2 deg temp rise per hour. This would be on warm, sunny days. Cool cloudy days where the air is cooler than the water your performance will drop off considerably. Salt is the least of your worries for heat exchangers, the total water chemistry (Ph, TA, etc ) will have a bigger impact on the life.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    In the Industry

    ps0303's Avatar
    Join Date
    Jul 2011

    Re: Gas heater for saltwater pools? And size heater needed?

    You do not need to have a cupro nickle heat exchanger on a salt pool. It is not the salt that will destroy it. Every day non cupro nickle gas heaters are installed on salt chlorinated pools and there is no ill effect to the copper heat exchanger. As long as you keep your pool water balanced and don't let it get too acidic, PH, you will be fine.

    I would not buy that Jandy Lite 2 heater.
    Paul 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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