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Thread: Thread type on drain of older water heater???

  1. #1
    DIY Junior Member rodney_kranz's Avatar
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    Apr 2011
    Greensboro, NC

    Default Thread type on drain of older water heater???

    Does anyone know what the thread is on 1992 vintage gas water heater drain spigot? I think I may have sediment in the tank and want to drain it with a garden hose, but the thread does not match the hose. I want to buy an adapter and have bought few guessing and have always guessed wrong and have not been able to find a match.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Sep 2004
    New England


    It should be one designed for a hose. If not, it may have already been changed once to a non-standard one. At nearing 10-years old, you are on borrowed time on a WH. It could last another 10-years, or fail tomorrow - average seems to be around 8-years. I wouldn't spend too much messing with it and budget for a new one soon.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Land of Cheese


    Or, if the water heater is not in a finished area which would be damaged when the tank starts leaking, run it until it fails. Both mine and my father's water heaters are about 25 years old and still work fine.

    As to the problem with your drain, I would just replace the drain valve on the tank with one that does fit a hose.

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona


    The valve originally had a hose thread, (ALL heater drain valves have hose threads and always have had them). If it were changed, then it might be a 3/4" pipe thread, but you hose would still attach to it. I am not sure what you think you have, but a picture might help us.

  5. #5
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    JDNashua pointed out, a 10 year old water heater is on borrowed time, but his math was a tad off. A 1992 water heat is nearly 20 years old. Your best move is to set aside some money for a new heater. There is surely so much sediment in your old tank you will never be able to flush it out.

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