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Thread: Intermittent Low Hot Water Pressure

  1. #1
    DIY Junior Member Stoph's Avatar
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    Sep 2011
    Location
    Toronto, ON
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    Question Intermittent Low Hot Water Pressure

    Hi,

    I have a problem with the hot water pressure.

    Many times after I flush the toilet, the hot water pressure (at the faucets) slows to a trickle. Once the toilet tank is full, there is a loud bang in the pipes and the hot water pressure (at the faucets) increases back to normal pressure. The toilet tank only has a cold water pipe connected to it.

    Also, sometimes (like this morning) when I turn on the hot water (at any faucet) it initially flows at normal pressure but immediately slows to a trickle and remains like that for a while. Then I hear a bang in the pipes and the pressure returns to normal. This happened without flushing the toilet.

    Any ideas what is causing this?


    Thanks
    Stoph

  2. #2
    DIYer, not in the trades LLigetfa's Avatar
    Join Date
    Feb 2011
    Location
    NW Ontario, Canada
    Posts
    3,685

    Default

    Many HWTs have anti-percolation checkvalves in them that can stick. I can often hear mine banging away and sometimes it sticks. I called the rental agency to fix it and we had someone lined up to come out but the wife cancelled after it stopped acting up. I started a thread on the issue a while back.

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