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Thread: Heater Drain Plug alternative?

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    dmcody's Avatar
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    Heater Drain Plug alternative?

    Opened my pool this weekend, and while screwing in the drain plugs to the 1987 heat exchanger, I noticed that the threads for the ¾” plug were non-existent. I’m talking absolutely smooth – see photo. Don’t know what happened (other than they rusted away), but I’m looking for suggestions on plugging this hole. My first attempt will be a mechanical plug, but I’m not sure how it will fare with the elevated temperatures. Alternately I could try and rethread the hole for a larger plug. I don’t have the tap, but I’m guessing a 1” would be the next common size up. Would there be any concerns with a 1” tap?

    Thanks
    Attached Images Attached Images
    Pool Type/Size: Inground Vinyl ~24,000 gal ~ 18' x 36'
    Filter Type: Pentair FNS Plus 36 - DE Filter
    Pump: Pentair Challenger - 1.5 hp
    Heater: Pentair Mastertemp 250K BTU
    Accessories: Hayward AquaRite SWG Controller

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    Mod Squad Bama Rambler's Avatar
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    Re: Heater Drain Plug alternative?

    That's on the water side so it doesn't really get all that hot. I'd ream the hole and try and expandable plug in it. And you're right, by the way, a 1" npt would be the next size up.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    dmcody's Avatar
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    Re: Heater Drain Plug alternative?

    Thanks
    Pool Type/Size: Inground Vinyl ~24,000 gal ~ 18' x 36'
    Filter Type: Pentair FNS Plus 36 - DE Filter
    Pump: Pentair Challenger - 1.5 hp
    Heater: Pentair Mastertemp 250K BTU
    Accessories: Hayward AquaRite SWG Controller

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    Re: Heater Drain Plug alternative?

    Quote Originally Posted by dmcody
    Thanks

    What kind of heater has a 3/4" drain plug in the header? I know many Laars/Raypak have a 3/4" for the pressure relief.
    20X40 30,000 gallon gunite pool

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    dmcody's Avatar
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    Re: Heater Drain Plug alternative?

    One that doesn't have a PRV installed. From looking at the parts breakdown, this plug is for a PRV. - Item #7. Its been like this since it was installed in 1987.
    Attached Images Attached Images
    Pool Type/Size: Inground Vinyl ~24,000 gal ~ 18' x 36'
    Filter Type: Pentair FNS Plus 36 - DE Filter
    Pump: Pentair Challenger - 1.5 hp
    Heater: Pentair Mastertemp 250K BTU
    Accessories: Hayward AquaRite SWG Controller

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