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BobSchaar's avatar
BobSchaar
Explorer
Jun 19, 2019

Hot water heater drain

The inner threads for the drain on my hot water heater are becoming quite corroded. I have to believe that this will eventually ruin the threads if I don't get it cleaned up soon. The plug itself can be cleaned up using a wire brush. What are people using for the inner threads of the drain? Is there an attachment available that can be used with a cordless drill? Some sort of chemical? I am new to this forum and not good at maneuvering around the different forums. Feel free to send answers to my PM. Thanks in advance! ...Bob

15 Replies

  • Thanks all. I have been using the tape, but apparently not every time I empty the heater, which is after every camping trip. I will be driving right past a Menards on my way home from work tonight so I will stop in to see what they have. I am able to get the anode rode/plug in about half way before the gunk stops it from turning. Until I get the gunk cleaned up, I suspect the crud will only get worse.
  • If you have a Suburban Brand with an anode rod....
    Drain hole threads are steel -- 3/4" NPT (tapered threads)
    Buy a 6" steel nipple and install it into drain hole screwing it in/out back/forth spraying it with some penetrating oil
    Due to tapered threads it will NOT go in fully....inner threads will still be gunked up. Just scrub them with a small wire brush....or not doesn't matter


    If you have an Atwood Brand....NO anode rod ---NYLON plug
    Drain hole threads are Aluminum -- 1/2" NPT (tapered threads)
    Buy a 6" brass nipple and install it into drain hole screwing it in/out back/forth spraying it with penetrating oil
    Due to tapered threads it will NOT go in fully....inner threads will still be gunked up. Just scrub them with a small wire brush....or not doesn't matter
  • A round wire brush or a pipe tap should do what you want. Then use some Teflon impregnated pipe dope in the drain plug.

    Richard
  • I used to use a dab of vaseline on the threads of the anode rod/plug when we had a standard 6 gal WH. It kept them in good shape.
    You can probably get a small diameter or small headed brass wire brush to clean them up at any hardware or big box store.
  • You can purchase wire brushes of small diameters... such as to fit a dremel.. are you using teflon tape around the plug?