A. O. Smith Corporation operates its business through two segments, which include North America and Rest of World. The Company's Rest of World segment primarily comprises China, Europe and India. The Rest of World segment supplies water heaters to the residential market in China with a range of product offering, including electric, gas, gas tankless, heat pump and solar units, as well as combi boilers. The Company's North America segment serves residential and commercial end markets in North America with a range of products, including water heaters, boilers and other. Its North America segment also manufactures and globally markets specialty commercial water heating equipment, condensing and non-condensing boilers and water systems tanks. Primarily for Asia, its Rest of World segment also manufactures and markets water treatment products. The Company also markets in-home air purification products in China.