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