Gas boiler, water heater and old black Iron pipe to Modern Modern Hydroponic. Heating Help needed.

I am in the process of remodeling my basement. I have everything opened up and notice old black pipes. I would like anyone to point me in the direction where i can find Modern Hydronic Heating information. Books, youtube any place where i can gasp information. I am trying to get rid of my old black iron loop and use Loop Manifold with PEX-AL-PEX or FostaPEX PEX-AL-PEX Tubing 1/2'' pipes. would it be possible to use copper K as my risers? Again any information would be great. i am drawing up my outline as i write. Thanks and help me through the leaning experience.