A. O. Smith
A. O. Smith manufactured its first residential water heater in 1939 which established a tradition of innovation that still continues to this day. A. O. Smith shipped its first commercial water heater in 1953. Equipped with a "glass-lined" tank, it remains the industry standard to protect steel from water corrosion. A. O. Smith is headquartered in Ashland City, Tennessee, home to the world's largest water heater factory. A. O. Smith has five manufacturing facilities in North America, with plants in Veldhoven, The Netherlands and Nanjing, China.