Read in the journal about lines freezing from boiler. I know of a few people that run a mix of rv anti-freeze in their system and have not had any problems. Its alot cheaper than regular boiler anti-freeze compared to 55 bucks for 5 gal bucket that I pd. I was told by one installer that rv was all he ever used and has never had a problem. He says biggest problem with outdoor boiler is acid eating out firebox in 8-10 yrs ,even stainless steel! have a Merry Christmas!
