Uponor (formerly Wirsbo) was the first to bring radiant floor heating to North America more than 40 years ago. Today, Uponor radiant floor heating (and even radiant cooling) bring comfort and energy efficiency to more homes around the globe than any other company. Uponor Radiant Floor Heating Systems circulate warm (or cool) water through tubes located underneath the floors. The comfort radiates up from the floor to warm or cool everything it comes in contact with — including people. And radiant is compatible under any type of floor covering — carpet, wood, slate, tile, linoleum and even concrete — making design possibilities endless.