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  1. #1
    Join Date
    Aug 2012
    Silver Creek, Ny
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    what type of plwood backer for tankless

    I'm puttitng in my first high efficiency tankless water heater this coming week and I want to put up a plywood backer to start the wall field.

    Does anyone know of any pre-existing requirements for plwood type?

    As a default I was going to use 3/4" fire rated because thats what required in commercial wall fields in electrical rooms I figured that would be more than enough!
    Perfect Practice Makes Perfect

  2. #2
    Join Date
    May 2012
    Upper Michigan
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    I'm sure that would be ok or CDX because they have zero clearance in the back from combustibles.

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