- Joined
- Jan 7, 2016
- Messages
- 3,289
The only risk with PEX in a floor is when it is being installed and if someone would happen to puncture it. PEX can be froze and thawed with no issues. The issues would be where the fittings are or the boiler itself, hence the addition of anti freeze to the heat loop. Both my houses have/had anti freeze solution, yet we never anticipate our house getting below zero. I believe that the anti freeze may provide some lubricity to the pumps, but I am not 100% sure of that.