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Buderus antifreeze

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PurpleKayak
PurpleKayak Member Posts: 4
in Gas Heating
I have a Buderus Logano g124x furnace in my home (bought my house in 2019, furnace was installed in 2002). During our annual maintenance visit, the tech noticed a bucket of Utility NoFreez sitting next to the furnace and said that the system needs to be flushed because this antifreeze can’t be used with our system. I’ve searched everywhere, in the manual and the internet, and can’t find any information on the correct antifreeze for this system. I know it’s a cast iron boiler, but why does that require aluminum-safe antifreeze? Thanks!

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 26,491
    Far as I can tell, he's off base. That company does make an aluminium safe version, but... in cast iron? Not needed.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    PurpleKayak
  • Ironman
    Ironman Member Posts: 7,771
    edited December 2020
    Your "tech" is wrong, Buderus doesn't require any special antifreeze for a cast iron boiler.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
    PurpleKayak
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 11,248
    edited December 2020
    You have the correct product in your system. That is what it is made for. Here is the literature for it.
    https://www.utilitychemicals.com/pdf_files/No Freez .pdf
    But don't be too hard on the lad. He probably was told to be careful with the proper antifreeze because there a number of aluminum boilers in service now. Buderus makes one. Yours is not that one.

    We all start learning somewhere. 'Good judgment comes from experience; experience comes from bad judgment'.

    BTW you have a boiler. A furnace is connected to ductwork and there is no water involved.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    PurpleKayakkcopp
  • PurpleKayak
    PurpleKayak Member Posts: 4
    Ironman said:
    Your "tech" is wrong, Buderus doesn't require any special antifreeze for a cast iron boiler.
    Thanks for the feedback. He also put in some AF during the annual service call, but it wasn’t until his follow-up to check the freeze/burst ratio that he said something about us needing aluminum-safe AF. So now I’m wondering what he put in during the servicing. Ugh.
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 11,248
    You are probably fine, You can put aluminum safe AF in a Cast-iron system. You can't put Utility No Freeze in an aluminum system.

    The guy who knows a lot about water quality and antifreeze is @hot_rod

    Now that I mentioned him, he will get a notification and be able to comment.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • PurpleKayak
    PurpleKayak Member Posts: 4
    edited December 2020
    EdTheHeaterMan said:
    BTW you have a boiler. A furnace is connected to ductwork and there is no water involved.
    LOL. I grew up in South Florida and now live in Maine so this is a whole new world for me! The guy is pretty young so I think you’re right. I guess as long as he put regular AF in during the latest service then we should be all set. Thanks!

    ETA: I see your new post and sounds like we’re okay either way. Thanks. 
  • PurpleKayak
    PurpleKayak Member Posts: 4
    Update: a different guy showed up planning to put in 5 gals. of NoFreez concentrate. Refractometer showed freeze/burst of 23 degrees/23 degrees. We live here year-round and have a wood stove next to the furnace, plus a generator, but I had him add 2 gals just to give us some elbow room. He also replaced an automatic air release valve. 

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