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Thread: Tankless water heater clearances

  1. #1

    Default Tankless water heater clearances

    I purchased a Powerstar AE115. the manual says no plastic piping within 3 feet of either side. It says nothing about over; below; or behind the unit. Do the sides of the heater really get hot enough to melt plastic? I have PVC condiut above the unit and washer hoses about 10 inches to the side. Will this be acceptable or do I have to relocate the unit? Tony

  2. #2
    I&C Engineer (mostly WWTP) Lakee911's Avatar
    Join Date
    Aug 2005
    Columbus, OH


    I would ask the mfg.


  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    That may pertain to pipes connected to the unit (the cold incoming and hot outgoing pipes). For a normal WH, they want metal within 18" (I think I've got this right now?!).

    Your best source is the manufacturer...
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default heater

    If the heater is getting hot enough to damage plastic within 3' of either side, you have a VERY inefficient heater which is wasting a lot of heat. In fact if it requires more than a few inches to combustible materials you don't want it.


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