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Thread: Low hot water flow all faucets

  1. #1
    DIY Junior Member snifferpro's Avatar
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    Default Low hot water flow all faucets

    A friend just called and said she has low hot water flow to all hot water taps.

    She drained the tank by attaching a hose to the drain valve and shutting off the water coming into
    The hose and opening the pressure relief valve.

    She said there appeared to be no sediment in the draining water.

    She then turned the water back on to the house, filled the tank, and had normal
    Flow at hot water taps.

    Later she called back and said flow was back to a trickle after the water had heated.

    Any suggestions?

    Thanks

  2. #2
    DIYer, not in the trades LLigetfa's Avatar
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    Heat traps can bung up causing that.

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    DIY Junior Member snifferpro's Avatar
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    What is a heat trap

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    DIYer, not in the trades LLigetfa's Avatar
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    Let me Google that for you.

    http://lmgtfy.com/?q=What+is+a+heat+trap

  5. #5
    DIY Junior Member snifferpro's Avatar
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    Thanks, that did the trick

  6. #6
    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by snifferpro View Post
    She then turned the water back on to the house, filled the tank, and had normal
    Flow at hot water taps.
    More often than not, it is the reverse. Draining/refilling can cause a large sudden influx of disturbed sediment that can bung up the heat traps.

    It has happened to me more than once and each time after I had turned off the all the water to work on the system. I am tempted to remove the heat traps entirely and probably will the next time I have to fight with it. The problem is my supply lines are hard copper and I'd have to cut and sweat in new fittings.

  7. #7
    DIY Junior Member snifferpro's Avatar
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    After getting the old nipples out with considerable effort, I found that the ball in the cold water nipple was solidly attached to the side of the nipple and ball in the hot water nipple
    was floating freely.

    After replacing both, hot water flow is back to normal.

    Again, thanks for the tip. saved a call to the plumber and I learned something new.

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