A. O. Smith Corporation manufactures and markets water heaters and boilers to the residential and commercial end markets primarily in the United States, Canada, China, Europe, India, and the Middle East. It operates in two segments, North America and Rest of World. The company offers electric, natural gas, gas tankless, and liquid propane model water heaters, as well as solar tank units for applications in residences, restaurants, hotels and motels, laundries, car washes, and small businesses; and residential boilers, as well as commercial boilers primarily for space heating applications in hospitals, schools, hotels, and other large commercial buildings. It also provides expansion tanks, commercial solar water heating systems, swimming pool and spa heaters, and related products and parts. The company sells its products through independent wholesale plumbing distributors, hardware and home center chains, and manufacturer representative firms. It sells water heaters to approximately 7,000 retail outlets, as well as water treatment products to 4,500 retail outlets in China. The company is headquartered in Milwaukee, Wisconsin.