Home › A. O. Smith

A. O. Smith serial number lookup

Find out when your A. O. Smith unit was made, and what that means for repairs, warranty and replacement.

• A. O. Smith water heater ageDecode the serial number · units built 1976–2007 and 2011–2026

Warranty: A. O. Smith's official warranty lookup · register your A. O. Smith unit

Related brands: State, American Water Heater