"BETA-32" wrote in message
. ..
Can PEX piping be used for a cast iron hot water radiator heating system?

Right now, the system is a combination of original galvanized steel pipes
and more recently added copper lines. I am just wondering if when moving
the location of a couple of the radiators for a remodel job, can I use
PEX to reconnect the radiators at their new locations?

Check with the manufacturer. Some have a temperature limit below what your
radiator may be.