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Stack temperature

bink Member Posts: 97
edited May 2018 in THE MAIN WALL
I have a Buderus G115/4 with Beckett nx burner. The nozzle installed is a .75 x 60 b. When this was installed in 2015 the techs measured stack temperature of 300 degree f. Today the tech said it was 350 degree f. Efficiency was around 84 %. He used manual
equipment not testa. Is there a problem with the set up . I called back and am waiting for a call back from the tech. What information should i ask for when he calls?
Thanks for any advice.


    EBEBRATT-Ed Member Posts: 15,764
    Stack temperature will vary depending on the the temperature of the boiler room when the test is taken (ambient temperature).

    Ask him for stack temp
    ambient air temperature
    Co ppm
    Co2 %
    02 %

    I wouldn't be concerned with 350 if all the #s are good and he cleaned the boiler properly. 300 is actually a little on the low end
  • bink
    bink Member Posts: 97
    Ok thanks for reply and advice
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    Draft and excess air also are a factor in stack temperature measurements.

    There was an error rendering this rich post.

    HVACNUT Member Posts: 5,874
    If he doesn't have a digital combustion analyzer that can print a report, then I wouldn't bother getting him back. Find another company.
    Did he do a smoke test and check/adjust draft? Should be -.02 breech on the G115.
  • newagedawn
    newagedawn Member Posts: 586
    buderus are like new cars takes time to break'em in, not surprised the stack temp went up alittle, you'll be fine i used the old school combustion kit till about 5 yrs ago, never had a problem but digital combustion is so much easier,lol
    "The bitter taste of a poor install lasts far longer than the JOY of the lowest price"