A.O. Smith is comprised of two reporting segments: North America and Rest of World. Co.'s Rest of World segment is primarily comprised of China, Europe and India. Both segments manufacture and market lines of residential and commercial gas and electric water heaters, boilers, tanks and water treatment products. Both segments primarily manufacture and market in their respective regions of the world. Co.'s Rest of World segment also manufactures and markets in-home air purification products in China. Co. serves residential and commercial end markets in North America with a range of products including water heaters, boilers, water treatment products, and other.