Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

Looking for examples of Flue Gas Condensation

Gerard Hazel
Gerard Hazel Member Posts: 1
I am developing a seminar for presentation at ISH in October on the causes and effects of Flue Gas Condensation
in Boilers and Breeching/Chimney Systems. If you have a story or a picture or a burner tube and would like to share your experience please contact me via E-Mail.
Gerry Hazel


  • hr
    hr Member Posts: 6,106
    Here are some examples

    Mis applied copper tube boilers, without return water temperature protection. Often with micro zoned short cycling, to boot :)

    hot rod

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Mark Hunt
    Mark Hunt Member Posts: 4,909
    Chimney pics

    Here are few pics of a plugged chimney.

    Flue gas condensation rotted the clay liner and the liner collapsed.

    All of the combustion products were venting into the basement and rising into the living space.

    Mark H

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • D lux_2
    D lux_2 Member Posts: 230
    flue condensation

    bacharach has some on there site
  • tim smith_2
    tim smith_2 Member Posts: 184
    boiler corrosion

    Those pics look like they are pool heaters, am I correct? Teledyne and Raypak always tried to rely on their thermal bypass in the header to control condensation in the heat x.
  • Ken D.
    Ken D. Member Posts: 836

    I see often where a masonry chimney deteriorates due to condensation. The terra-cotta liner flakes and cracks, the chimney block gets efflorecsense and the morter between blocks gets like mush.Stucco loosens and falls off. Paint peels. Stains appear on the outside surface. I am going to reline a chimney with said problems in a few weeks. I,ll send pictures.
  • rich pickering
    rich pickering Member Posts: 277

    This is a pool boiler.
    Should have shrunk it but it looks better close up.
  • Jim Davis
    Jim Davis Member Posts: 305
    flue condensation

    Are you including water heaters(low water temperatures) in this presentation and that flue liners don't necessarily solve the problem?(Baracharch pictures) I will also be at ISH
This discussion has been closed.