A.O. Smith manufactures and markets residential and commercial gas, heat pump and electric water heaters, boilers, tanks and water treatment products. Co.'s North America segment serves residential and commercial end markets with a range of products including: Water heaters, Boilers, Water treatment products and Other, which manufactures expansion tanks, commercial solar water heating systems, swimming pool and spa heaters, related products and parts. Co.'s Rest of World segment manufactures and markets water treatment products, primarily incorporating reverse osmosis technology, and commercial water treatment products. Co. also designs and markets range hoods and cooktops in China.