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flue pipe deteriorating

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Paul S_3
Paul S_3 Member Posts: 1,261
in THE MAIN WALL
what would cause this 2 condensing water heaters with the flue pipe deteriorating...only 2 years old....performed combustion analysis all ok....the manual says use pvc and/or stainless....I think the flue is the wrong type?
ASM Mechanical Company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
ASMMECHANICALCORP@GMAIL.COM
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company

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  • Ironman
    Ironman Member Posts: 7,376
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    I don't understand why they started with PVC and then transitioned to stainless. If PVC is good enough close to the burner, then it would be good enough farther away.

    Check your firing rate on each burner to confirm it's what it's rated for.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Tinman
    Tinman Member Posts: 2,808
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    Look at the detail of the flue gas path. I can't believe that's how the manufacturer calls for that, especially the use of the Y PVC fitting?
    Steve Minnich
  • Henry
    Henry Member Posts: 998
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    It is not listed for a condensing boiler application. S636 is for condensing boilers.
  • Paul S_3
    Paul S_3 Member Posts: 1,261
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    The stainless pipe is not listed for condensing boilers?
    ASM Mechanical Company
    Located in Staten Island NY
    Servicing all 5 boroughs of NYC.
    347-692-4777
    ASMMECHANICALCORP@GMAIL.COM
    ASMHVACNYC.COM
    https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
  • njtommy
    njtommy Member Posts: 1,105
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    I'm sure your not supposed to use the Y style T. That seems silly to me.
  • Tinman
    Tinman Member Posts: 2,808
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    Or have a 45 looking down any flue?
    Steve Minnich

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