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new boiler and venting options

Timco
Timco Member Posts: 3,040
in THE MAIN WALL
Use an indirect water heater...no vent. If you go mod /con, just pvc pipes out the side. NFGC has diagrams on venting requirements with windows around. You may also consider catII fan-assist units with chimney vent adapters or a concentric vent out the side. CO alarms from big box stores do not register low levels of CO, and you need to know the actual levels. Have a pro test your equipment and test for CO, and go to NCI or CO Experts websites and find a good low level CO detector. I would not trust any other.

Tim
Just a guy running some pipes.

Comments

  • newbie_4
    newbie_4 Member Posts: 1
    new boiler and venting options

    Currently running an old oil boiler for steam system. I'd like to upgrade the boiler and, all things being equal, I'd convert to NG, but oil's no problem either.

    However, I fear this new boiler might outlive my chimney liner. This is an 80 yr old tile liner without a cap. No tiles are missing but some are splayed and there are small mortar gaps here and there. I have CO sensors and they never measure a blip so I feel okay going with the chimney as is... for now...

    But, I'd like to look ahead for when the liner may worsen. It's an 8x8" flue, and the chimney guys say the largest stainless liner they can fit in there is 6", which I'm told isn't large enough for the recommended boiler (Burnham IN7) and standalone NG water heater. Chipping out the tiles is an option ($4000) but the fireplace flue is at risk in the process. I'd prefer not to have to go that route.

    This has me consider direct vent options, but Burnham doesn't make a large enough unit, and I don't have a lot of clearance from windows etc, for the new vent.

    Are there other options here I'm over looking? Are there models that can vent through smaller flues, or are there DV models I can vent through my present chimney for now with the option to vent through the wall if need be later?

    I just don't want to install a boiler now whose life is limited by that of an old chimney.

    All thoughts are most welcome!
  • Joe Brix
    Joe Brix Member Posts: 626
    Over 200K BTU

    steam, I don't think you're gonna find a flue size under 7"
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