A. O. Smith Corporation engages in the manufacture and sale of water heaters and boilers to the residential and commercial markets primarily in the United States, Canada, Europe, India, and China. The company operates in two segments, North America and Rest of World. It offers a line of natural gas, liquid propane, solar tank, gas tankless, and electric water heaters for applications in residences, restaurants, hotels and motels, laundries, car washes, and small businesses; and residential and commercial boilers primarily for space heating applications in buildings, hospitals, schools, hotels, and other large commercial buildings. The company also provides copper-tube boilers and expansion tanks, commercial solar 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 operates 5,450 stores. The company is headquartered in Milwaukee, Wisconsin.