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Buderus oil boiler and cracked thimble

donald73d Member Posts: 1
I have a Buderus oil boiler and during normal cleaning it was noticed that a chunk of flue tile had cracked and fallen away in the thimble.

Chimney company says the issue is the efficiency of the Buderus and low stack temp which means condensation which causes the cracks. He said its not uncommon with the Buderus oil boilers. The only permanent solution is a SS chimney liner.



  • Jolly Bodger
    Jolly Bodger Member Posts: 209
    New oil burners/equipment have lower stack temps than old and the clay and masonry chimneys cant handle it long term. When I was installing them I would always line the chimney. Often in tuneups i would find mortar joints in bad shape and end up lining chimneys for old equipment too.
    HVACNUT Member Posts: 5,864
    Yes, you'll need a stainless liner. I'm surprised it wasn't done at the time of the installation. What model Buderus and burner?
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    Agree with @HVACNUT.
    Also a good time to run a camera down the chimney and check for damage to the integrity of the chimney.
    The SS liner fixes draft and needed for condensation, but doesn't fix the chimney.

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