How Many Btus Can A 1/2 PEX Carry?
How Many Btus Can A 1/2 PEX Carry? PEX Tubing Size Recommended Circuit length Floor output (BTU/sq ft/hr) 3/8′′ PEX 200ft 22-30 1/2′′ PEX 300ft22-30 5/8′′ PEX 400ft 10-24 3/4′′ PEX 500ft 17-26 How far apart should radiant tubing be? Ideally, the heat transfer plates should be spaced continuously but they don’t have to be.