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Thread: hot water recirc loop

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  1. #1

    Default hot water recirc loop

    installed a gravity hot water recirc loop and now it seems my hot water supply runs out much faster than it used to. I have the pipe insulated, it is 3/4 inch all the way back to heater. do I need to install a check valve, or what? The hot water comes almost instant but runs out too quick. can anyone help? Thank you.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default pipe

    Without a check valve at the heater, the cold water in the bottom of the tank will backflow and give you cold or cool water at the faucet.

  3. #3


    installed check valve at heater, everything ok now, thanks.


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