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

    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?
  2. GrumpyPlumber

    GrumpyPlumber Licensed Grump

    Jun 18, 2007
    Plumber, self employed
    Licensed Grump
    Most likely for condensate, high efficiency gas units leave a lot of water behind in the exhaust.
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  4. srdenny

    srdenny Plumbing Contractor

    Sep 11, 2004
    Plumbing Contractor
    SF Peninsula
    Put in a vertical condensate tee and all will be well.
  5. billhayton

    billhayton New Member

    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
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