I'm installing a steam generator and a tankless water heater. I want to know if I can use ProPEX for the P&T relief and for the steam generator's auto drain valve.
The googling I did on the P&T valve was that the plumbing needed to be secured and that it was hard to secure PEX. for the tankless I was going to use a PEX to Brass threaded fitting with ears and secure that to the wall and exit the side of the house.
The steam generator P&T and drain is going to be plumbed into the grate of a 10x10 floor drain and secured to the drain cover. Of course with the 1" air gap to where the actual water drains.