A. O. Smith Corporation manufactures and markets residential and commercial water heaters, boilers, heat pumps, tanks, and water treatment products across North America, China, Europe, and India. Its offerings include water heaters for homes and businesses, boilers for hospitals, schools, hotels, and large commercial buildings, and water treatment products such as water softeners, well water solutions, whole-home filtration, and point-of-use carbon and reverse osmosis systems. The company also provides commercial water treatment and filtration products, expansion tanks, solar water heating systems, pool and spa heaters, and related parts. Products are sold under brands including A. O. Smith, State, Lochinvar, Hague, Water-Right, Master Water, Atlantic Filter, Impact, and Water Tec, distributed through independent wholesale plumbing distributors, retail hardware and home center chains, and manufacturer representative firms, as well as directly to consumers via e-commerce for Aquasana branded products and through dealer networks and Amazon for A. O. Smith branded water treatment products. Founded in 1874, the company is headquartered in Milwaukee, Wisconsin.