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Laars FT Combi Boiler Doesn't Need Flushing?

JohnScott78 Member Posts: 1
I have a 2-year old Laars FT Combi boiler. FTCF199N.
The installer said that it doesn't need to be flushed, ever.
The manual doesn't call for a flush on any period of time, but does include instructions for flushing.
I was wondering if there is some common opinion on on how often it should be flushed?


  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,832
    The potable water side will needs to be flushed with a vinegar solution on a regular basis. The fresh water condition will determine the frequency

    The closed loop side not so much.
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
  • hot_rod
    hot_rod Member Posts: 22,121
    On the potable side if the heat exchanger it comes down to how hard your water is, and how much water you flow through it

    It could be a yearly requirement or maybe every 2-3 years. If your hot water capacity drops off, or less flow that indicates it us time to delime the heat exchanger

    The boiler itself should be opened and cleaned every couple years, basically cleaning the fire tubes with a spray cleaner and checking burner calibration after reassembly 

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • GroundUp
    GroundUp Member Posts: 1,907
    If the installer had that level of intelligence, I wonder what else he skimped on.