A. O. Smith Corporation is a manufacturer of residential and commercial water heating equipment, as well as a manufacturer of water purification products. The Company serves a mix of residential and commercial end markets principally in the United States. It operates in two segments: North America and Rest of World. Both segments manufacture and market a range of residential and commercial gas, gas tankless and electric water heaters. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing and non-condensing boilers and water systems tanks. It also manufactures expansion tanks, commercial solar water heating systems, swimming pool and spa heaters, and related products and parts. The Rest of World segment primarily consists of China, Europe and India, and manufactures and markets water treatment products, primarily in Asia. It sells water heaters to the European and Middle Eastern markets and water treatment products in Turkey.