PEX Tubing questions

Being in the HVAC field, the type per you use depends on the type system you are using if its a open loop system or a closed loop system, Open loop system you can use regular pex pipe like for water lines and it will with stand temps for what u need rad flooring water temps usually run around 140 deg. If you are using a closed loop system u will need to use what they call heat pex it has a oxygen barrier that prevents air from seaping into the pipe, use a 2" foam board with a 1'6" spacing between loops and your better off to buy in large footage rolls that way u don't have any joints under the slab that's big problems in the future cause concrete will eat through the fittings, Open system would be like a outdoor wood boiler, Centeral, Taylor etc are some brand names, if u are going closed loop Burnam is a name brand, u can also save your self some money and buy a water coil blower combo with a t-stat that operates the pump and would heat ur shop great,:happy1: