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

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  1. #1

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

    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. #2
    Licensed Grump GrumpyPlumber's Avatar
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    Most likely for condensate, high efficiency gas units leave a lot of water behind in the exhaust.
    "The biggest regrets we have in life are the chances we never took."

  3. #3
    Plumbing Contractor srdenny's Avatar
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    Put in a vertical condensate tee and all will be well.

  4. #4

    Default 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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