Overheat with Pex?

[Birdman]

I will be using my livingroom baseboard zone ( 30 ft of bigh output baseboard) as the overheat zone. Can i use pex to connect the system? How hot is the water when the electricity goes out and the water is gravity fed to this zone?

 

[pybyr]

I am in the middle of figuring out my final plan for my dump zone too

everything I have read seems to recommend against using pex in the dump zone: here's why- when you rely only on the gravity flow, which is all you have in a power-off-gravity-fed dump zone, gravity's flow can be slower and more inconsistent than a pump's - and if you get a sudden extreme hot pocket or tiny bit of steam in a pocket in PEX, what might "blow over" in a metal pipe might "blow up" the PEX

I like PEX, but I would not use it in a gravity dump zone.

if you have some kind of backup power (like a computer "UPS") for your dump zone pump, as some people are doing, then that re-opens the idea of using PEX in a normal heating zone that will also be your dump zone