About A.O. Smith

For more than 70 years, millions of business owners, property managers, consumers, and engineers have relied on A.O. Smith for innovative and reliable hot water solutions. A.O. Smith's selection of residential and commercial water heaters and storage tanks is unmatched, and available only to industry professionals. Headquartered in Ashland City, Tennessee, A.O. Smith operates the world's largest water heater factory.

Improve Resident Satisfaction and Retention

A.O. Smith water heaters are industry leaders in first-hour delivery, producing both hot water and happy residents.

Reduce Operating Costs

Permaglas™ Tank Lining

Corrosion is the primary reason that water heater tanks fail, causing expensive repair or replacement work. A.O. Smith's Permaglas™ tank lining is the gold-standard in protecting against leaks and helps prevent corrosion.


As deposits of lime and other sediments accumulate inside the tank, you'll notice reduced energy efficiency and higher operating costs. A.O. Smith offers residential water heaters with DynaClean™ — featuring water jets that redirect the incoming cold water, creating turbulence in the tank, which helps reduce lime build-up.

Save Maintenance Time

A.O. Smith products are designed with professionals in mind. They include installer-friendly features that allow for flexibility for easy installation, as well as Honeywell gas valve, brass drain valve, and single-function anode rods that save time on repair and maintenance.

Industry-Leading Technology

A.O. Smith has a long history of designing highly innovative products, and the new Cyclone® Mxi is no exception. The full line of A.O. Smith Cyclone® Mxi condensing water heaters are built to provide years of dependable service and yes we do feature industry-leading technology. Models are available from 120,000 to 500,000 btu/h and all deliver thermal efficiencies of up to 98%.

  • Fully Modulating Combustion - Modulates the firing rate as the demand changes. Modulating the burner results in higher overall operating efficiencies and longer service life
  • Unique Helical Coil Heat Exchanger - Fewer weld joints helps provide fewer leak opportunities, and optimal service life while maximizing heat transfer.
  • Powered Anodes On All Models - Titanium powered anodes are standard on all model sizes. Powered anodes work in all water conditions, never need replacements, and the eliminate possibility of strong water odors usually related to conventional anodes.

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