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Thread: Black water coming from gas waterheater

  1. #1
    DIY Junior Member bbarbee's Avatar
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    Default Black water coming from gas waterheater

    Hi, Terry sent me here to ask the group.

    We have a new home...only 7 yres old.
    The gas water heater is the same age.

    one about every 6 months or so...we have a very odd thing happen

    we get periodic bursts of black(not brown) water from the hot water lines.

    if we turn the tub on hot so we get a thick stream of water...you can see a black horizonal line about 1/8-1/4" thick every now and again.

    if i drain the tank fully and let it refill...the problem goes away for another 6 months or so...this is the 3rd time it has happened.

    Also...the water doesnt smell funny or anything. we even filled the bathtub up to see if it would stink... it didnt. although the water was a light grey color by the time it finished filling.

    any ideas?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Do you have flexible lines feeding the WH? Some of those, not all, are lined with rubber which can break down and put black crud into the water.

    Does this happen at all fixtures in the house, or only the tub/shower?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member bbarbee's Avatar
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    all faucets...its just easier to see in the tub due to the thickness of the waterflow

    the lines feedign the water heater are the solid metal ones with joints...the kind that have to be soldered inplace

  4. #4
    DIY Senior Member Runs with bison's Avatar
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    What temperature do you run the water heater at? You should be able to discern this from the dial--typically 10 F increments on the graduations, with 120 F being the normal (white mark on mine) and a thick bar for 130 F on mine.

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