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  1. #1
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    long island
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    Default Shared Venting gas boiler and water heater

    i did a house the other day and this came up, i drew a blank for a moment . i call out the obvious defect of back drafting on the hot water heater. now here is my question.

    on a same fuel flue vent: for example.
    a system with a separate hot water heater and boiler is sharing the same vent system, the hot water heater is the last on the flue then the boiler the chimney connection ... so it goes hot water heater - boiler then the chimney connection. is this aloud ,,, i had always thought that largest btu unit has to be the furthest away on the connection hook up . any thoughts on this....

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  2. #2
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    Aug 2007
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    Default Re: Shared Venting gas boiler and water heater

    Quote Originally Posted by les jansson View Post

    . any thoughts on this....
    .
    Any Pictures of this?
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  3. #3
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    Default Re: Shared Venting gas boiler and water heater

    sorry no pics ,,, just wondering about the simple standard theory of the connection ....


  4. #4
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    Default Re: Shared Venting gas boiler and water heater

    Quote Originally Posted by les jansson View Post
    .
    sorry no pics ,,, just wondering about the simple standard theory of the connection ....
    .
    theory of the connection
    .
    Smallest BTU is Closes to the termination of the vent.
    *Does not thwart smaller appliance venting and helps pull the weaker exhaust vapors along and out of the flue pipe.
    .

    Last edited by Billy Stephens; 05-11-2010 at 09:07 PM.
    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  5. #5
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    Jul 2008
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    long island
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    Default Re: Shared Venting gas boiler and water heater

    when you say termination do you mean would be the furthest away from connection to chimney?


  6. #6
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
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    1,643

    Cool Re: Shared Venting gas boiler and water heater

    The reason the code calls for the smaller BTU appliance to enter above the larger has nothing to do with competition within the breaching. It simply allows the smaller appliance to have more vent rise than the larger. Smaller appliances are more prone to backdrafting when the larger appiance is at standby and esp. during summer when the natural draft is weakest.

    Keep the fire in the fireplace.

  7. #7
    Join Date
    Aug 2007
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    Memphis TN.
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    Default Re: Shared Venting gas boiler and water heater

    Quote Originally Posted by les jansson View Post
    when you say termination do you mean would be the furthest away from connection to chimney?
    .
    What Bob Said He's " The Man. "
    * or darn close to him.
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  8. #8
    Join Date
    Jul 2008
    Location
    long island
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    11

    Default Re: Shared Venting gas boiler and water heater

    thanks for the info


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