Hydronic systems
lexible, easy to work with, and available in large spools, the cross-linked polyethylene tubing known as PEX is the backbone of any hydronic radiant floor-heating system. Because it can snake its way under a floor in continuous loops with interruption, it reduces the chance of leaks. Usually spaced about 9 inches apart, PEX tubing can go where electric cables aren’t allowed, including in walls and ceilings—and it’s usually less expensive to heat its water to warm large surfaces like a family room floor or even a driveway. PEX can be embedded on its own in concrete slabs; to