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power venting into chimney

kevin coppinger_4
kevin coppinger_4 Member Posts: 2,124
in THE MAIN WALL
where the old boiler is shot...Customer wants an Energy star rated boiler installed...it has an older b vent chimney that I would like to use..problem is that It is almost impossible to find a energy star rated gas boiler that is natural draft...Buderus 124x comes close...If i go power vent can/should I vent it into the chimney..it would be energy star rated then...I cant go directly outside due to structural issues (ie 6x6 sill)...any thoughts.ty,kpc

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Comments

  • terry_5
    terry_5 Member Posts: 92


    install a liner?
  • JackFre
    JackFre Member Posts: 225
    Catagory...?

    Careful of the terminology. You cannot "power vent" into a chimney. A chimney is a negative pressure device and a power venter is a positive pressure device.
  • Al Letellier_9
    Al Letellier_9 Member Posts: 929
    power vent

    Kevin, we had a similar situation where we were installing 2 Buderus 334's with not enough chimney size for natural drafting both boilers. Called Buderus and they recommended using a Tjerlund chimney top venter...I think it was an FSUD.....tough spot to put something for servicing, but it did the trick. If the chimney you have is in serviceable condition and rated for the BTUs, it might be the answer for you. Get in touch with Jack or Kevin at Frederick/Geraghty. They're great at resolving issue like this.

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  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    ok..

    induced draft...Burnham allows you to do this w/ their 2pvbut it is not Energy star rated...she does not a $$$ condening boiler..go figure. kpc

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  • Dave_4
    Dave_4 Member Posts: 1,405
    Category?

    Check the manufacturer's installation instructions of the specific appliance (and Category) you want to use before you "commit" to the installation.

    You can typically vent all "listed" Category I equipment through B vent (see Section 503.6 of the 03 IFGC)also check (Chimney Section 503.5,,503.7,,503.53,,&503.4.2), however you must check the sizing in the venting tables that accompany the appliance and cross reference them with the Fuel Gas Code in your area (I'm using the 03 IFGC in the "Great State of New Jersey").

    Category I appliances operate under a negative or neutral vent pressure, are noncondensing appliances, and may generate vent gases with temperatures up to 550 degrees. A Category I appliance can use a draft hood OR an integral vent blower or "draft inducer" (fan assisted).

    When you "step up to" a Category II appliance, these also operate under negative or neutral vent pressure, but the vent gas temperature and percent of CO yeild a flue loss of less than 17%, meaning that condensation of flue gasses can occur. Vent systems serving Category II appliances fall under the "special vent" provisions and can be found in Section 501.14, 503.4 and 503.6.9.2.


    Robert O'Connor/NJ
  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    Al thanks...

    I think at this point I will "find" a way to get it vented out the side...if i have to find a corner to box in....I don't like roof tops...kpc

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