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  1. #1
    Join Date
    Jul 2007
    Posts
    79

    flue pipes for hot water heater and furnace

    does it matter which pipe is over the other pipe,my hot water heater flue pipe is under the furnace flue pipe venting thru the chimney,does that have to be switched so the higher pressure flue pipe of the water heater is above the furnace flue pipe,or does it really make any difference,thanks

  2. #2
    Join Date
    Jul 2002
    Location
    Yuma, AZ
    Posts
    2,361
    If you have any concerns I recommend seeing if there is a record of a permit on either appliance. Probably not. I then recommend buying a permit. The building inspector will verify the safety of your installation. Safety is more important than "free".
    "I have never let my schooling interfere with my education."
    Mark Twain
    More at: http://www.quotationspage.com/subjects/education/

  3. #3
    Join Date
    Jul 2006
    Posts
    1,091

  4. #4
    Join Date
    Jan 2010
    Location
    Athens GA
    Posts
    1,234
    Wye are you so confused,doesn't the smaller pipe go into the larger pipe?
    The larger btu goes stright into the chimney and the smaller btu meets it at the corner,,,thats wye.

  5. #5
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,692
    Quote Originally Posted by REP View Post
    Wye are you so confused,doesn't the smaller pipe go into the larger pipe?
    The larger btu goes stright into the chimney and the smaller btu meets it at the corner,,,thats wye.
    It sounds like they are talking about a brick chimney situation.

    Yes, the W/H should be above the furnace vent.

    Re-vent the furnace at the chimney putting in a wye and vent the W/H into it.

  6. #6
    Join Date
    Jul 2007
    Posts
    79
    why exactly does the water heater flue pipe have to be over the furnace flue pipe

  7. #7
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,692
    Quote Originally Posted by salv97 View Post
    why exactly does the water heater flue pipe have to be over the furnace flue pipe
    It vents better and it's code.

  8. #8
    Join Date
    Jul 2007
    Posts
    79
    ok it vents better,is there any issue with gasses from the water heater finding their way to the furnace thru the furnace flue,thanks

  9. #9
    Join Date
    Jan 2011
    Location
    Huntley, IL
    Posts
    25
    It would take a really strong downdraft in the chimney to push the water heater gases down, into the furnace vent connector and then into the furnace. It will only rarely happen- assuming the house isn't negatively pressurized by some other piece(s) of equipment...

  10. #10
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,692
    Quote Originally Posted by salv97 View Post
    ok it vents better,is there any issue with gasses from the water heater finding their way to the furnace thru the furnace flue,thanks
    I saw one case (on a wall furnace) were the furnace was vented above the W/H.

    The furnace would not (always) vent properly.

  11. #11
    Join Date
    Feb 2004
    Location
    chicago suburbs
    Posts
    4,422
    the OP is a DIYer...check his other threads. now he needs help. Ban him.
    FILL OUT YOUR PROFILE!!

  12. #12
    Join Date
    Dec 2001
    Location
    Ocean Pines, MD
    Posts
    6,988
    Borderline.
    But there are a lot of issues you can have. CO at the top. Have it checked by someone who knows how.

  13. #13
    Join Date
    Jul 2002
    Location
    Yuma, AZ
    Posts
    2,361
    Quote Originally Posted by tinner73 View Post
    the OP is a DIYer...check his other threads. now he needs help. Ban him.
    It is dangerous to advise on flue piping. How do you know that the flue is located per code on the ceiling or is double wall where it needs to be or any other of a dozen subtle errors?

    Let him call a pro. He probably has no desire to have his installation inspected as I suggested. Cest la vie.
    "I have never let my schooling interfere with my education."
    Mark Twain
    More at: http://www.quotationspage.com/subjects/education/

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