A. O. Smith Corp. manufactures residential and commercial water heating equipment and air purification products. It operates through the following two segments: North America and Rest of World. The North America segment manufactures and markets comprehensive lines of residential and commercial gas and electric water heaters, boilers, tanks. The Rest of World segment comprises of China, Europe, and India; and manufactures and markets water treatment products. The company was founded by Charles Jeremiah Smith in 1874 and is headquartered in Milwaukee, WI.