A. O. Smith Corporation applies technologies and solutions to products manufactured and marketed worldwide. The Company operates through two segments: North America and Rest of World. Both the segments manufacture and market a comprehensive line of residential and commercial gas and electric water heaters, boilers, tanks, and water treatment products. Its Rest of World segment is primarily comprised of China, Europe, and India. The North America segment serves residential and commercial end markets with a range of products, including water heaters, boilers, water treatment products, and others. The Company also manufactures expansion tanks, commercial solar water heating systems, swimming pool and spa heaters, related products and parts. Its Lochinvar brand is a residential and commercial boiler brand in the United States. Its water softener branded products and problem well water solutions include the Hague, Water-Right, Master Water, Atlantic Filter, Impact, and Water Tec brands.