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Thread: Hot water recirc loop issues

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  1. #1
    DIY Junior Member Kendal's Avatar
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    Default Hot water recirc loop issues

    Hi all,
    I have a recirculation loop in my new home. It is approx 250' start to finish--one long loop with t's off for the fixtures. Instant hot water when you turn it on. However, I'm having an issue when I turn on a faucet/shower nearby. The original faucet that was turned on is hot, and the next one is luke warm or even chilly. When I shut them both off and then turn the second one on, it's hot...here is a picture. Please let me know what you think
    Name:  water heater loop diagram.jpg
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    Thank you,
    Kendal

  2. #2
    Moderator & Master Plumber hj's Avatar
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    The check valve has to be on the recirulation line. When you open ANY faucet, the cold water is flowing backwards through the circulation line. Whether the water turns warm or cold depends on how fast it is flowing and how long it is run. I would also put the pump in the circulation line so any hot water used does not have to work its way through the pump, which can just exacerbate the problem.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member Kendal's Avatar
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    Hello,
    Thank you for the reply. So if I move the check valve as in picture below, i won't need to leave the one in the current location to prevent hot water from backing into the cold? Also, would the recirc pump go here in picture below? any other thoughts would be appreciated.Name:  water heater loop diagram updated.jpg
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  4. #4
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    You will be far better off with the recirc loop connecting to the bottom of the heater with the circulator pulling the water back to the bottom of the heater with the check valve below the circulator.

    John

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    In the Trades Jerome2877's Avatar
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    For what you paid for sharkbites you could have hired a plumber to do this right the first time.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Yes to both questions, and you might also install a ball valve between the check valve and connection to the cold water line.
    Licensed residential and commercial plumber

  7. #7
    DIY Junior Member Kendal's Avatar
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    Quote Originally Posted by Jerome2877 View Post
    For what you paid for sharkbites you could have hired a plumber to do this right the first time.
    i did fyi...

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