Mad Trapper
Member
I run Hercules Chemical buffered Propolyene Glycol in my shop PEX closed loop system. It's good for -100 before solidifying and it's cheap too...and non toxic. Only way to fly
What he said. Good anti-corrosion anti freeze in the hydronic system, make sure your backflow valve on the feed is working. You can do this yourself with a pump if you have things setup with proper boiler drains/valves..
Also makes sure you have purged any air from the system