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Cast iron radiators and condensing boiler

ukie
ukie Member Posts: 4
in Radiant Heating
Planning to install condensing boiler on system with old cast iron . I worry about heatexchenger to clogged with graphite and dirt . Has anyone done it ? How ? how does it work in long run?

Comments

  • Ironman
    Ironman Member Posts: 7,516
    We do it all the time and it works great if done correctly.

    Use a firetube boiler, a magnetic dirt separator and power flush the old system thoroughly. 
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    kcoppEdTheHeaterManPC7060
  • ukie
    ukie Member Posts: 4
    what do you use for power flush ? Which firetub boiler are you using ?
  • Ironman
    Ironman Member Posts: 7,516
    Water.
     Lochinvar, Bradford White F/T, HTP EFTU.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • kcopp
    kcopp Member Posts: 4,462
    I actually just designed my own system w/ CI rads I have picked up over the years.
    IBC SFC combi boiler. I installed a Fernox TF1 filter on the return, Filled the system w/ axiom filtered fill water.
    Added cleaner to the system and ran it for 2 weeks.
    Surprisingly I have not picked up a lot of junk in the mag filter.
    The purge water was not crazy dirty.
    I will add some inhibitor soon.



  • flat_twin
    flat_twin Member Posts: 353
    edited January 4
    Ninety year old cast iron radiator system tied to a firetube modcon for the last seven years. Flushed with water when installed. Added Sentinel X100 inhibitor per mfg instructions and ph is checked every year. Boiler water is still clear. This is city water and I had it tested to make sure it was within the specs given by the boiler mfg.
    dkohot_rod

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