I had a copper (baseboard heat) pipe freeze and burst, and need to replace a run of pipe that's exposed to that kind of cold when it gets below 0F outside. The pipe is below the floor on an exterior wall, and is just a horizontal run between baseboard radiators.
I have a temporary fix in place, but two of my solder joints apparently were bad and have a few little leaks, which I have hose clamps and rubber gaskets over temporarily.
So my question is, would there be a problem replacing this section of pipe with PEX? I like the idea of using PEX since I wouldn't have to solder, and it would theoretically stand up better against the cold (though I am also going to try to address the cold air getting to the pipe).