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  1. #1
    Join Date
    Apr 2019
    Location
    California
    Posts
    35

    Default Tankless Venting

    Doing the report now, so any quick responses would be grateful.

    Question regarding a tankless water heater, do both vents need to terminate outside. This was mounted in the garage and I can only assume this is intake, and there is a single out take.

    DSCN8929 (450x338).jpgDSCN8918 (450x338).jpg

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  2. #2
    Join Date
    Mar 2007
    Location
    Orlando, FL
    Posts
    1,464

    Default Re: Tankless Venting

    Noritz lists all the vent requirements for the specific models in the install guide.

    Interior installation of the direct vent unit when supplying combustion air from indoors is listed/allowed under certain conditions, on water heaters labeled "SV convertible", with the appropriate adaptors.

    Here is an example of the specs:
    https://www.noritz.com/wp-content/up...B-rev.0117.pdf

    And an adaptor:
    Conversion kit


  3. #3
    Join Date
    Apr 2019
    Location
    California
    Posts
    35

    Default Re: Tankless Venting

    Quote Originally Posted by Dom D'Agostino View Post
    Noritz lists all the vent requirements for the specific models in the install guide.

    Interior installation of the direct vent unit when supplying combustion air from indoors is listed/allowed under certain conditions, on water heaters labeled "SV convertible", with the appropriate adaptors.

    Here is an example of the specs:
    https://www.noritz.com/wp-content/up...B-rev.0117.pdf

    And an adaptor:
    Conversion kit

    Thank you, however I do not agree with it to allow combustion air from a garage, with the possibility of fumes around the area.


  4. #4
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    27,354

    Default Re: Tankless Venting

    Quote Originally Posted by Dom D'Agostino View Post
    Interior installation of the direct vent unit when supplying combustion air from indoors is listed/allowed under certain conditions, on water heaters labeled "SV convertible", with the appropriate adaptors.
    See note at top of page 22, then read what is shown on page 22 when using combustion air from indoors (see table, 3rd column from left, for indoor makeup air) ... note that it states "free area" of each opening - the code states reductions for metal louvers and for wood louvers which take into consideration the metal or wood louvers (slats) reducing the measured opening size of the opening to a "net free vent area" size of the opening (think of it as sliding all the louvers down to the bottom or to one side, the size of the opening which would be left is the "net free vent area", or, in this case, the "free area" required).

    Jerry Peck
    Construction Litigation Consultant ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  5. #5
    Join Date
    Mar 2007
    Location
    Orlando, FL
    Posts
    1,464

    Default Re: Tankless Venting

    Quote Originally Posted by Joe Reilly View Post
    Thank you, however I do not agree with it to allow combustion air from a garage, with the possibility of fumes around the area.
    Water heaters have been using garage combustion air for many decades; they require properly configured supply to allow adequate air flow, and several other considerations for a safe and compliant installation.

    Otherwise, just install a direct vent model (and install it as a DV unit).


  6. #6
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    27,354

    Default Re: Tankless Venting

    Quote Originally Posted by Joe Reilly View Post
    Thank you, however I do not agree with it to allow combustion air from a garage, with the possibility of fumes around the area.
    Are you concerned when you see other gas heaters (furnaces and water heaters) in the garage drawing combustion air from the garage? Same concerns (or lack thereof) would be applicable to these types of gas heaters too.

    Jerry Peck
    Construction Litigation Consultant ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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