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  1. #1
    Bruce Hutton's Avatar
    Bruce Hutton Guest

    Default Furnace / water heater venting

    Furnace / water heater venting

    The piping at the right is the furnace flue piping the one at the left is the water heater flue vent piping. These are running into a liner pipe that is installed in the chimney.

    Is this acceptable for venting...shouldnt the smaller piping be vented above the larger piping & not Y'd together?
    Couldnt this cause a backdrafting issue?

    What are your thoughts?
    Any guidance would be appreciated.
    (I do have issues with the rusting as well)

    Thanks in advance
    Bruce

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  2. #2
    Join Date
    Dec 2008
    Location
    Maryland
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    Default Re: Furnace / water heater venting

    Thee appears (hard to tell) to be an old furnace port to the chimney that has been sealed.
    If that is the case then when a new furnace was installed that had a different height for discharge, the H2O heater port for the chimney was used (probably enlarged also).

    There is a pesky notion that the H2O heater should be installed above the furnace as they enter the chimney.

    Also, if you might use the view that the H2O heater is entering the flue above the furnace and thus is at a height above the furnace discharge head and thus meets that requirement. Though the angels of the pipe look low.


  3. #3
    Daniel Gailey's Avatar
    Daniel Gailey Guest

    Default Re: Furnace / water heater venting

    i was taught & always told that the water heater pipe (smaller) needs to be above the furnace flue pipe


  4. #4
    Join Date
    Dec 2008
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    Maryland
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    Default Re: Furnace / water heater venting

    Quote Originally Posted by Daniel Gailey View Post
    i was taught & always told that the water heater pipe (smaller) needs to be above the furnace flue pipe
    The H2O is above the furnanance but befor the chimney.


  5. #5
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,643

    Cool Re: Furnace / water heater venting

    The code contradicts itself. In one place, it states for the smaller input appliance to breech the chimney above the larger. Elsewhere, it allows manifolding before the chimney breeching.

    The liner appears to be a little lower than either vent connector. Why is so much of the liner exposed? Is it not mortared into place?

    If this is an aluminum liner, it, too will be corroded some. Should get a level II followed by combustion analysis. Is the furnace a fan assisted 80%'er?

    Keep the fire in the fireplace.

  6. #6
    David Bell's Avatar
    David Bell Guest

    Default Re: Furnace / water heater venting

    The wye they used appears to have crimped ends facing the equipment which could lead to flue gasses escaping and could explain the rusting at the connection points. Probably not of correct gauge for use as a flue connector. Also appears that B-vent is being used to connect the furnace and is also installed in reverse of proper flow.


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