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Thread: Gas pipe size for pool heater?

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    Question Gas pipe size for pool heater?

    Hi guys,

    The previous owner of my home had a natural gas heater for his jacuzzi and also a natural gas grill that were each served by their own 3/4" gas pipe. He removed both of these items and capped off the two 3/4" gas pipes which are located next to my pool pump / filter. My understanding is that even a "small" pool heater (e.g. 260K BTU) needs at least 1" or 1.25" gas pipes and that a 400K BTU heater likely needs 1.5" pipes.

    Can I somehow combine the two 3/4" pipes (Y-connector?) to create a larger 1.5" pipe and get the required gas flow for a pool heater or am I looking at an expensive new pipe-laying under my home? Apologies if this is a dumb question!

    cheers,

    P.

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    ps0303's Avatar
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    Re: Gas pipe size for pool heater?

    No. You need a larger pipe from the source to the equipment. Find a qualified gas person to check things out and provide you a solution.
    Paul
    Gastek Pool & Gas Services If you would like to provide a review of the help I provided, please use the following link to leave a review. Gastek Google review,
    Check out some videos on my YouTube channel - Gastekservices on YouTube

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    Re: Gas pipe size for pool heater?

    The size of the heater and distance of pipe are the big factors. Here is the manual for my Jandy heater.

    15,200 gallon Steel/Vinyl "Mountain Lake" Jandy 1 h.p. pump, 260,000 JXi heater, CV340 cartridge filter, True Clear SWG and 2 multi-color LED lights.

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    PoolGate's Avatar
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    Re: Gas pipe size for pool heater?

    You can use a smaller pipe if the pressure is increased. This is how my 400k NG heater gas line was run. The gas company installed a high pressure outlet on my meter and they ran it from there. I think it is only 3/4". Ask your gas plumber!
    29k Gallon Free Form Gunite Pool, 3 floor returns, 2 wall returns, 1 vacuum pressure port, 2 skimmers, Main drain, Jandy 2.7HP VSP, Jandy JXI400N Gas Heater, Jandy CV340 Cartridge Filter, FusionSoft 1400 SWG, 2 Watercolors LED, iAqualink with PDA, Sheer Waterfall, Rock Waterfall, 9' Deep End w/Diving Board, SunDeck, Polaris 9650iQ, TF-100 - Pool Build - 2017 - Google Photos

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    avspin's Avatar
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    Re: Gas pipe size for pool heater?

    My gas supplier did something to mine. I've been running a 1" line about 35' for a 400k for 17 years and two heaters and no problems.
    Installed 2002, 16x40 in ground 20k gal, San Juan fiberglass, concrete deck, equipment pad 4' below pool level, ccp 420 filter, 1.5HP Whisperflo, 400 Mastertemp HD NG, IC40 SWG, IntellipH, SAM LED, Coverpools in deck automatic cover. Winterized from 10/1 to 5/1. TF-100. Also Caldera Niagra Spa 500 Gal 2015

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    ChuckDavis's Avatar
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    Re: Gas pipe size for pool heater?

    The previous owner of our house (aka Beauzeaux, who amazingly was a pool contractor) installed a 75 foot run of 3/4" gas pipe from the meter around the outside of the house to the pool heater.................using PVC pipe!

    Using a published table, the HVAC contractor I engaged to replace the gas line to the pool heater determined that 3/4" would be too small for that long a run. There would be too much pressure drop. The solution was to upgrade to a "2 pound" system. The gas company installed a different meter which outputs gas at 2 PSI. The piping from the meter into the house was still 3/4", but there is a regulator at each appliance (furnace, stove, pool heater) to drop the pressure. The project took several days and lots of $$.

    After all that, when I fired up the pool heater, I discovered that because of the undersized (3/4") piping that Beauzeaux used, and the resulting low gas pressure, the burners in the heater had been running "cool" with lots of moisture in the flames. Because of the moisture, the core of the heater was entirely rusted out. I ended up junking the heater and replacing it with a heat pump. (The core had also dumped copper into the water, which turned bright green the first time I shocked the pool.)

    If you can upgrade your house to a "2 pound" system, you should be able to use one of the existing 3/4" pipes. As recommended above, do consult with a qualified plumber or HVAC contractor.
    15,000 gallon IGP, epoxy surface, waterfall, borates (!), not closed in winter
    SuperPump with 2.4 THP EcoTech variable speed motor, Tagelus TA-60 filter with zeolite media, Liquidator, AquaComfort heat pump, Blue-White flowmeter, Smartpool Wall Climber
    TF-100, LaMotte metal sequestrant test kits
    Sundance Capri hot tub

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    Re: Gas pipe size for pool heater?

    I am currently going through the gas line issue. My house only has 250k coming in and my heater is 400k. I need 650k to run my heater and the things in my home. The max they can bring in on a regular meter in my area is 600k. The plumber (to the tune of $2,000) installed all the needed things this week and tomorrow the gas company is coming to change out my meter and regulator. I am going to be overclocked at 850k. The gas company told me not to turn my heater on until the work is completed because I could blow out my line.
    16x32 IG rectangular 21,800k new vinyl liner 2014, Triton II TR 50 sand Filter, Pentair 3/4 hsp whisperflow pump, 3 returns, TF100 test kit w/speedstir. Maytronics s300i robot, Raypak 406k Heater.

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    Re: Gas pipe size for pool heater?

    Oh boy. I can't wait to see your gas bill!
    15,200 gallon Steel/Vinyl "Mountain Lake" Jandy 1 h.p. pump, 260,000 JXi heater, CV340 cartridge filter, True Clear SWG and 2 multi-color LED lights.

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