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Thread: Water Heater ATP discharge line - how far off ground outside

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    DIY Junior Member fortop's Avatar
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    Default Water Heater ATP discharge line - how far off ground outside

    I am installing a new gas water heater in a utility closet which will have an ATP discharge line going through an outside wall and terminating in a 90 degree bend and short pipe pointed down toward the ground. How far off the ground should that termination after the 90 be? Seems like I read a min/max limit in UPC somewhere.

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    Plumber jimbo's Avatar
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    min 6" max12"

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    What he said !

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    DIY Senior Member SteveW's Avatar
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    What is an "ATP discharge line?"

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    DIY Senior Member bluebinky's Avatar
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    Quote Originally Posted by SteveW View Post
    What is an "ATP discharge line?"
    Automatic Temperature and Pressure relief valve discharge line -- I think

  6. #6
    DIY Senior Member SteveW's Avatar
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    Thanks - figured it was in reference to the water heater's temperature/pressure valve but thought maybe this was something new.

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