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Thread: Recirculation Loop not working properly

  1. #1
    DIY Junior Member robmckinley's Avatar
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    Default Recirculation Loop not working properly

    Just installed a new recirculation loop and it does not improve the time to deliver hot water. Here is what I have: Recirculation line starts by splicing into the 3/4" hot water line closest to my furthurest faucet (15 feet). I used 1/2" CPVC to come off the 3/4" exsisting hot water. The line comes back to the hot water heater. The line first goes into a Grundos Recirc Pump, then into a check valve, then into the bottom of the Water heater where the drain was previously. I have the total recirc line covered with insulation. The pump is lined up correclty. The pump is pushing water (I think) because I feel hot water throughout the recirc line. The pump is currently running 24 hours a day. PROBLEM: All facuets continue to take several minutes to get hot water to them. What happened?? Greatly appreciate any help....

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    The pump should be pulling the water back to the tank. The check valve must also have the flow arrow pointing to the tank.

    John

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    Moderator & Master Plumber hj's Avatar
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    If the "furthest faucet" is only 20' from the heater, you should not have needed a circulation system. The "furthest faucet" should have "instant" hot water. If it does, but none of the others do, then the problem is the way the piping is arranged and the "hot water loop" bypasses them. If it does NOT, then you have installed something improperly, but without seeing it we cannot tell you what it is.
    Last edited by hj; 01-06-2013 at 06:37 AM.
    Licensed residential and commercial plumber

  4. #4
    DIY Junior Member robmckinley's Avatar
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    Quote Originally Posted by johnjh2o1 View Post
    The pump should be pulling the water back to the tank. The check valve must also have the flow arrow pointing to the tank.

    John
    The check valve is directed correctly and working properly.

  5. #5
    DIY Junior Member robmckinley's Avatar
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    HJ....I wasn't very clear originallyy. What I meant to say is the I tied into the Hot Water line, in the attic approx 20 feet from the the furthest bathroom. The run back to the hot water heater is approx 40 feet. In the attic the the Recirculation loop is warm to the touch.

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    20' of 3/4" pipe holds about a half a gallon. So, with vanity faucets limited to around 2gpm, it would take about 30-seconds to purge that water from your recycling point to the faucet IF you had it turned to all hot (probably not the normal situation). Want it faster, move the connection closer to the point of use. Most recirculation systems loop back at the point of use, then you only have to purge from the supply line to the risers for the faucet.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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