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!
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