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Oversized Boiler

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robinmunroe
robinmunroe Member Posts: 6
edited April 2023 in Chimneys & Flues
Time to think about replacing 30 year old boiler. Adjacent flue is woodstove. Chimney centrally located. 7" C vent about 4" from plaster at thimble. Typical 8x8 flue tiles. Utica MGB 150K. Don't need mod/con. Looking for smaller (100K), maybe 5" vent. My question is: since 5" may still be too close to combustibles, can B vent help my situation?

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  • EzzyT
    EzzyT Member Posts: 1,297
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    Yes B-Vent will work for your situation 
    E-Travis Mechanical LLC
    Etravismechanical@gmail.com
    201-887-8856
  • robinmunroe
    robinmunroe Member Posts: 6
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    That's good. I can't find help on the web. Will 5" or 6" B vent fit in the 7" thimble? Does B vent need to continue beyond the thimble (up the chimney)? And how would you support it?
  • Big Ed_4
    Big Ed_4 Member Posts: 2,835
    edited April 2023
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    It should be code to have a two foot space around the boiler .....

    There was an error rendering this rich post.

    Mad Dog_2
  • Jamie Hall
    Jamie Hall Member Posts: 23,657
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    Big Ed_4 said:

    It should be code to have a two foot space around the boiler .....

    Um yeah... where is this? Perhaps better not say. There is no code I know of which would permit that installation.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Mad Dog_2
  • robinmunroe
    robinmunroe Member Posts: 6
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    Thanks, it seems to me that the sides conform to minimums with the exception of the control side you see in the photo. This brings me to the replacement (Peerless MH04/05) and original vent question to correct to minimums. I need to know about B vent installations.
    Mad Dog_2
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,250
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    Oh My.....Hate to have to service that!  Tell me there is a backside to that space with access to other side of boiler.  Mad Dog
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,250
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    The original installer had a Thang for putting his Gate & Globe Valves upside down.  Ok...As long as they hold right?  Mad Dog 
  • hot_rod
    hot_rod Member Posts: 22,483
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    Mad Dog_2 said:

    The original installer had a Thang for putting his Gate & Globe Valves upside down.  Ok...As long as they hold right?  Mad Dog 

    Pumps also
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Mad Dog_2