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A.O. Smith


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A.O. Smith manufactures energy efficient gas and electric water heaters and boilers. Recognized as an Energy Star Partner, A.O. Smith makes water heaters for both residential and commercial purposes. The company is headquartered in Milwaukee, WI and trades under AOS on the NYSE. Net sales in 2008 were 2.3 billion.

Corporate History

A.O. Smith was created in 1874. Over the years, they have manufactured parts for baby carriages, bicycles, and automobiles. In 1936, A.O. Smith patented its glass-lined water tank and started mass production of these tanks in 1939.

Product Lines

A.O. Smith was the first company to create glass-lined residential water tanks. In 2004, it began manufacturing Blue Diamond™ glass coating on its Conservationist® water heaters which provides more than two times the corrosion resistance of its competitors. Residential electric heaters include:

  • Conservationist,
  • ProMax®, and
  • Energy Saver Manufactured Housing.

Residential gas heaters include

  • Vertex® Power-Vent and Power-Direct Vent;
  • Conservationist,
  • ProMax,
  • Power House® Specialty Vent,
  • Energy Saver for Manufactured Housing, and
  • On-Demand Water Heaters.

Contacting A.O. Smith

A.O. Smith Corporation
P. O. Box 245008
Milwaukee, Wisconsin 53224

A.O. Smith's Warranty

A.O. Smith offers 10- and 6-year warranties on their water heaters. Details vary per model to include tank and parts warranties. The Energy Saver electric and Solar Booster tank come with a 5-year warranty on the tank and 1-year on the parts.

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