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  1. #1
    Jon mackay's Avatar
    Jon mackay Guest

    Default Boiler vent size increase

    Is it always the case that the boiler vent size must increase when you add a water heater vent or are there exceptions?

    In this case, a 150,000 BTU Boiler with 40,000 BTU Water heater.

    I was thinking it needs to increase but wanted to double check.

    Thanks..

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  2. #2
    Jack Murdock's Avatar
    Jack Murdock Guest

    Default Re: Boiler vent size increase

    Jon,
    NFPA 54 is pretty clear on venting 2 natural draft appliances but first,
    is it a masonry chimney and if so inside or outside?
    chimney size and height?
    any other appliances?
    what is the connector sizes?
    it looks like 3" into 6"?
    what part of USA are you in?

    Thanks
    Jack
    MGF 3828
    JGF 3910


  3. #3
    Jon mackay's Avatar
    Jon mackay Guest

    Default Re: Boiler vent size increase

    It is a masonry chimney that is an exterior mount.
    The height is approximately 28' - 30'
    3" into 6"
    No other appliances
    Binghamton, NY

    Thank you Jack


  4. #4
    Jack Murdock's Avatar
    Jack Murdock Guest

    Default Re: Boiler vent size increase

    jon,
    what size is the chimney? 12 x 12? 24 x 24?

    thanks

    jack


  5. #5
    Jon mackay's Avatar
    Jon mackay Guest

    Default Re: Boiler vent size increase

    12 x 12 is the chimney flue size.


  6. #6
    Jon mackay's Avatar
    Jon mackay Guest

    Default Re: Boiler vent size increase

    Jack,
    were you able to determine the requirements with the information?


    Thank you,

    JOn


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