Gap between water heater and vent duct

Discussion in 'Water Heaters and Softeners' started by scattershot, Nov 25, 2019.

Help Support Plumbing Forums by donating:

  1. Nov 25, 2019 #1

    scattershot

    scattershot

    scattershot

    Member

    Joined:
    Apr 11, 2013
    Messages:
    13
    Likes Received:
    0
    Location:
    ,
    Today I noticed that there's about a 1.5" gap between the exhaust opening top of our water heater (tank, natural gas) in our basement and the metal duct that carries away the products of combustion to a vent on the side of our house.

    Is that normal? By comparison, it looks like the vent duct for our space heater is fully attached to the heater body.
     
  2. Nov 25, 2019 #2

    Jeff Handy

    Jeff Handy

    Jeff Handy

    Pro Handyman, NOT A Pro Plumber

    Joined:
    Jul 5, 2019
    Messages:
    984
    Likes Received:
    154
    Location:
    Chicago suburbs
    If there is a little oversized cap sitting on short metal legs on top of the heater exhaust, that then feeds into the exhaust vent, you are ok.

    That air gap is to allow the rising exhaust gases to pull room air behind them, to help them “draft” or to rise up and out.
     
  3. Nov 29, 2019 #3

    SHEPLMBR

    SHEPLMBR

    SHEPLMBR

    not a Junior Member anymore! Sponsor

    Joined:
    Mar 9, 2016
    Messages:
    823
    Likes Received:
    164
    Location:
    NOKESVILLE, VA
    PICTURES?
     
    MASTRPLUMB likes this.
  4. Nov 30, 2019 #4

    Jeff Handy

    Jeff Handy

    Jeff Handy

    Pro Handyman, NOT A Pro Plumber

    Joined:
    Jul 5, 2019
    Messages:
    984
    Likes Received:
    154
    Location:
    Chicago suburbs
    DEBC6B76-BA64-4232-AD13-6F4BAAE39A8E.jpeg If the gap you are talking about is like this, where you can see under the cap that conducts the water heater exhaust into the vent going outside, then you are ok.
     
  5. Nov 30, 2019 #5

    Jeff Handy

    Jeff Handy

    Jeff Handy

    Pro Handyman, NOT A Pro Plumber

    Joined:
    Jul 5, 2019
    Messages:
    984
    Likes Received:
    154
    Location:
    Chicago suburbs
    When the water heater is running for awhile, you can hold a lit match or lighter right next to that little gap under the exhaust hood.

    If the flame gets pulled strongly into that gap, then your flue is drafting well and you are fine.
     
    MASTRPLUMB likes this.

Draft saved Draft deleted

Share This Page