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Another Flue Question

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by Mark_ms, Jan 28, 2008.

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  1. Mark_ms

    Mark_ms Member

    Joined:
    Jan 28, 2008
    Messages:
    198
    Loc:
    Upstate NY on VT Border
    I just found this site a couple of days ago...lot of good info!!

    I am just beginning to explore the purchase of a fireplace wood insert as a primary source of heat.

    One thing that concerns me cost wise, is the fact I have been informed that you may not have two heat sources (wood and boiler) going up the chimney. From what I have read here it is against most codes.

    I have not been up on my roof to look at my chimney (it's a wife thing) 8-/ but I have looked at my flue from the bottom up and it seems to me that the fireplace flue is considerably more narrow than I had thought it would be, based on overall size looking at it from outside. Speaking of looking at chimney from the outside it looks like there in separate flue for the oil boiler which would (I think) account for the fact of the "narrowness" of the chimney flue.

    So I guess my question is...if in fact the boiler has it's own "separate" enclosed flue would I be able to vent the Wood Insert up the existing chimney or would I still have to re-vent the boiler??

    Look forward to your replies,

    Mark_ms

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  2. Eric Johnson

    Eric Johnson Mod Emeritus

    Joined:
    Nov 18, 2005
    Messages:
    5,705
    Loc:
    Central NYS
    Hi Mark and welcome to the Boiler Room.

    My understanding is that if there are separate flues in the same chimney, they can be used for different appliances. If there is only one, however, then you have to choose. Sounds to me like you've got a double, which would mean you could hook both a woodstove and a separate boiler up to each one, although the fireplace flue will have to be modified (replace the damper with a block-off plate) before you can use it for a stove or an insert.

    What kind of boiler do you have--gas or oil?
  3. Mark_ms

    Mark_ms Member

    Joined:
    Jan 28, 2008
    Messages:
    198
    Loc:
    Upstate NY on VT Border
    Ooops...Oil fired boiler, Does it make a difference between Oil and Gas??


    Mark_ms

    PS You and I are close about 45 minutes apart....
  4. Eric Johnson

    Eric Johnson Mod Emeritus

    Joined:
    Nov 18, 2005
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    5,705
    Loc:
    Central NYS
    No, it doesn't matter. I'm just being nosy.

    We can't be that close--Albany is an hour and a half away from me (just south of Utica).
  5. Mark_ms

    Mark_ms Member

    Joined:
    Jan 28, 2008
    Messages:
    198
    Loc:
    Upstate NY on VT Border
    Ooops again I was thinking of Clifton Park...
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