We spoke to the manufacturer this morning, and then to the chemist for loc-line.
The melting point is 340*. After 170* they may not be able to bend around as they are designed. She did not know of any harmful chemicals that would enter a liquid at only boiling.
They offer a double joint connector so you can add a threaded end on the bottom end with a coupler.
I bought this and am going to use a 1/2" compression fitting with a SS tube that goes down into the boiling wort for the whirlpool.