| Year | Detail |
| 1874 |
A. O. Smith Corporation was founded in 1874 by Charles Jeremiah Smith as C. J. Smith and Sons, a baby carriage and bicycle parts manufacturer. It began forming steel tubing from sheet metal to make bicycle frames. |
| 1899 |
Arthur O. Smith, the founder's son, developed the world’s first pressed steel automobile frame, a lighter, more cost-effective alternative to existing frames. |
| 1914 |
A. O. Smith introduced the Smith Motor Wheel, a gasoline-powered bicycle device. It developed the Smith Flyer three years later, known as “the world’s first sports car.” This technology was eventually sold to Milwaukee's Briggs & Stratton Company. |
| 1925 |
A. O. Smith introduced the first arc-welded, high-pressure vessel to refine oil. Through 1963, the company produced pressure vessels for various chemical processing, refinery, and related applications. |
| 1940 |
A. O. Smith acquired Los Angeles, California-based Sawyer Electric, a manufacturer of electric motors, including a pump motor that could be used in oil well applications. |
| 1948 |
The company acquired Toledo, Ohio-based Burkay Company and entered the coil-type “instantaneous” commercial water heater market. Five years later, the first glass-lined commercial water heater was introduced. |
| 1961 |
The company opened its first commercial water heater and boiler plant outside the U.S. in Stratford, Ontario, Canada. |
| 1972 |
The company opened its first European operations in Veldhoven, the Netherlands. Originally a sales office serving Europe and the Middle East, the facility expanded to include assembly and, eventually, fabrication of water heaters. |
| 2001 |
The company acquired State Industries, Inc., nearly doubling the size of its water heater business. The acquisition enabled the company to enter the retail market segment. |
| 2009 |
The company entered the water purification industry with a new venture: A. O. Smith (Shanghai) Water Treatment Products Co. Ltd. The new company supplies reverse osmosis water treatment and water filtration products to the China residential and commercial markets. |
| 2011 |
A.O. Smith sold its electric motor business to Regal Beloit Corp. and acquired Lochinvar Corp., a Lebanon, Tennessee-based manufacturer of high-efficiency condensing residential and commercial boilers for hot water and hydronic heating applications. |
| 2017 |
A. O. Smith expanded its North American water treatment presence by acquiring Groveport, Ohio-based Hague Quality Water, a manufacturer of a comprehensive line of water softener products sold through retail and dealer channels. |
| 2019 |
The company acquired Water-Right, Inc., a water quality solutions provider based in Appleton, Wisconsin, that offers a complete line of residential and commercial products and systems for various applications. |
| 2021 |
The company expanded its portfolio in water heating by purchasing Montreal, Quebec-based Giant Factories, Inc., and in water treatment by purchasing Pottstown, Pennsylvania-based Master Water Conditioning Corp. |