A radiant system heats or cools an indoor space by circulating a fluid, generally a water/glycol mixture, through a network of PEX pipe. In a radiant heating application, a heat source (condensing boiler, geothermal heat pump, etc.) warms a fluid. A pump circulates the fluid through the heat source and out to the area you are heating. The warm fluid branches into many, smaller closed-loop circuits of PEX. The circuits of pipe are evenly spaced, hidden behind a finished surface. The network of PEX gently warms the room. As the fluid cools, it passes through the heat source again. A radiant cooling system uses a chilled water source and circulates cool water instead of warm water. There are two primary ways to install a radiant heating system with PEX: wet systems and dry systems.
Contact a REHAU radiant expert for more installation information