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Thread: Hot water heater drain

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  1. #1

    Default Hot water heater drain

    I went to go drain my hot water heater... Craftmaster,30 gal. , double element. Turned off the breaker to HWH,turned off the water supply,opened up the hot water side on a faucet,hooked a short hose to drain valve on HWH and opened valve. Spurts of water came out of the hose at first ,then nothing ,so i figured perhaps it might be plugged up with sediment at the valve. Tryed more than a bunch of times to try and blast through if it was sediment built up turning the water supply on and off leaving the water on for a few seconds to a few minutes...Each time with the water on and off water came out of the hose clear and in a full stream,then i'd go to turn the water off and within a few seconds stop. I tryed opening the pressure relief valve to while water on or off no difference . Is there some safety type valve that needs to be open as well i am missing? Or is this a one time HWH use it then get rid of it....lol
    Much appreciated to all!

  2. #2
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    It does sound like clogging issues. But you do have to have a tap open on a hot water faucet, or tip open the relief valve, to release the vacuum .

  3. #3
    DIY Junior Member DallasDIY's Avatar
    Join Date
    Mar 2008
    Dallas, Texas


    Have you tried it yet with multiple hot water faucets open at the same time? If you have a two-story house, have you opened something upstairs and down? As a last try to release any vacuum, maybe open all the sink and tub faucets you have to see if that makes a difference.

  4. #4

    Default hot water heater drain

    Thanks for the reply Dallas and jimbo.

    I did try with the pressure relief valve tipped and all hot water taps open in the bathroom and kitchen what is left yet to open is the tub/shower hot side.. will try that next... The thing i do not really understand if clogging is an issue or the like is why does water flow very well out of the HWH valve when i turn the water supply on.... when i turn off the water supply water flow ceases. Plus the water is clear with no hints of cloudy sediment stuff...

  5. #5
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
    Join Date
    Nov 2005
    Central Florida


    Try leaving all HW faucets closed, drain open, CW on. If that doesn't blow the crud out through the drain, remove the drain valve.

  6. #6
    Union plumber/pipefitter-self employed Garydaplummer's Avatar
    Join Date
    Jan 2008
    Mechanicsburg, PA

    Default Another trick

    Something I try before removing the drain valve is to connect a washing machine hose to the drain valve then connect a garden hose from that to an outside faucet or washing machine cold water connection if nearby. Open up the drain valve then the outside faucet and reverse the flow into the water heater through the drain valve for a few seconds. 3/4 of the time this dislodges the sediment blocking the drain valve and once you remove the hose from the outside faucet it will drain. It's worked numerous times for me.


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