A. O. Smith Corp. manufactures residential and commercial water heating equipment and air purification products. It operates through the North America and Rest of World segments. The North America segment manufactures and globally markets specialty commercial water heating equipment, condensing and non-condensing boilers, and water systems 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.