Water Heater ATP discharge line - how far off ground outside

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by fortop, Mar 3, 2012.

  1. fortop

    fortop New Member

    Messages:
    28
    Location:
    Tucson
    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.
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    min 6" max12"
  3. MACPLUMB 777

    MACPLUMB 777 TROJAN WORLDWIDE SALES RP

    Messages:
    679
    Location:
    Houston, Texas, United States
    What he said !
  4. SteveW

    SteveW DIY Senior Member

    Messages:
    1,054
    Location:
    Omaha, NE
    What is an "ATP discharge line?"
  5. bluebinky

    bluebinky Member

    Messages:
    408
    Location:
    Santa Clara, CA
    Automatic Temperature and Pressure relief valve discharge line -- I think :cool:
  6. SteveW

    SteveW DIY Senior Member

    Messages:
    1,054
    Location:
    Omaha, NE
    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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