On Noritz Tankless why can first vertical run of vent be 3' or less?

Discussion in 'Tankless Water Heater Forum' started by billhayton, Jan 30, 2008.

  1. billhayton

    billhayton New Member

    Joined:
    Dec 16, 2007
    Installing Noritz 931 and read the first vertical run cannot exceed 3'..if you add a horizontal section and then go vertical again that ok.

    Any reason for this...does too much vertical venting cause suffocation of unit?
     
    billhayton, Jan 30, 2008
    #1
  2. GrumpyPlumber

    GrumpyPlumber Licensed Grump

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    Plumber, self employed
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    Most likely for condensate, high efficiency gas units leave a lot of water behind in the exhaust.
     
    GrumpyPlumber, Jan 31, 2008
    #2
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  4. srdenny

    srdenny Plumbing Contractor

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    Put in a vertical condensate tee and all will be well.
     
    srdenny, Jan 31, 2008
    #3
  5. billhayton

    billhayton New Member

    Joined:
    Dec 16, 2007
    you guys are good...

    Makes sense the condensate accumulation is not something noritz or anyone else wants running back to unit.

    thanks for the posts
     
    billhayton, Jan 31, 2008
    #4
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