Tankless water heater clearances

Discussion in 'Tankless Water Heater Forum' started by slodog, Mar 3, 2008.

  1. slodog

    slodog New Member

    Mar 3, 2008
    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. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Aug 23, 2005
    I&C Engineer (mostly WWTP)
    Columbus, OH
    I would ask the mfg.

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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    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...
  5. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    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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