I know that PEX is extensively used in low temperature radiant heat systems. I have read that it is rated for a max of 200 deg F. I am re-piping my single zone radiator hot water system into two zones. Currently, the system uses black pipe and I am wondering if I can use PEX to reconnect and rezone some of the radiators. I am planning on using black pipe or copper around the boiler, circulators and the valves, but PEX sure would be nice to tie into the existing system.
Does anyone have any experience using PEX in a hot water system? Thanks in advance for all your suggestions and help.