we have an apartment that has had all the copper stolen. at the cost of copper i am consedering using plastic. i have never used plastic for boiler heating, i know i have to use copper at the boiler as to not expose plastic to exsesive heat. i know it works great with water but i have never used it on a boiler. i am looking for pro's & con's. is clamping or shark bites better. i don't think it is safe to glue or is it. there are 2 type of plastic which is better?