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Thread: Tankless WH TPR

  1. #1
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    Default Tankless WH TPR

    Checked the manufactures installation and there is no call for the TPR to terminate to the exterior. I dont see too many tankless and the ones I do typically terminate to the exterior. So does manufacture trump local standard?

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  2. #2
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    Default Re: Tankless WH TPR

    Quote Originally Posted by Marc M View Post
    Checked the manufactures installation and there is no call for the TPR to terminate to the exterior. I dont see too many tankless and the ones I do typically terminate to the exterior. So does manufacture trump local standard?
    No, Yes, and it depends!

    The WH manufacturer does not make the TPR valve.
    The TPR valve manufacturer defaults to the local AHJ!

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  3. #3
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    Default Re: Tankless WH TPR

    LOL... Masterfully articulated.

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  4. #4
    Hector Acevedo's Avatar
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    Default Re: Tankless WH TPR

    Hi Marc, I have installed only 2 tankless water heaters by Poloma and Reehm. Here is what the instructions call for by the manu. A new pressure relief valve, complying with the Standard for Relief Valves and Automatic Gas Shut-OFF Devices for Hot Water Supply Systems, ANSI Z21.22/CSA 4.4, must be installed at the hot water outlet connection of the water heater at the time of the installation. Local codes shall govern the installation of relief valves.

    Reading out of the 2003 IRC P2803.6.1 Requirements of discharge pipe. The outlet of a pressure relief valve, temperature relief valve or combination thereof, shall not be directly connected to the drainage system.

    I hope this helps.


  5. #5
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    Default Re: Tankless WH TPR

    Yes it does...thanks for the reply.

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  6. #6
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    Default Re: Tankless WH TPR

    Found this...
    P2803.6.1 Requirements for discharge pipe.
    The discharge
    piping serving a pressure-relief valve, temperature
    relief valve or combination valve shall:
    1. Not be directly connected to the drainage system.
    2. Discharge through an air gap located in the same
    room as the water heater.
    3. Not be smaller than the diameter of the outlet of the
    valve served and shall discharge full size to the air
    gap.
    4. Serve a single relief device and shall not connect to
    piping serving any other relief device or equipment.
    5. Discharge to the floor, to the pan serving the water
    heater or storage tank, to a waste receptor or to the
    outdoors.
    6. Discharge in a manner that does not cause personal
    injury or structural damage.
    7. Discharge to a termination point that is readily
    observable by the building occupants.
    8. Not be trapped.
    9. Be installed to flow by gravity.
    10. Not terminate more than 6 inches (152 mm) above
    the floor or waste receptor.
    11. Not have a threaded connection at the end of the piping.
    12. Not have valves or tee fittings.
    13. Be constructed of those materials listed in Section
    P2904.5 or materials tested, rated and
    approved for

    such use in accordance with ASME A112.4.1.


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