Water heaters / Kenmore

How old is my Kenmore water heater?

KenmoreChange
Only A.O. Smith-built units are covered.
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Where to find the serial number

Rating label on the side of a tank water heater
Close-up of a rating label showing the serial numberLook for “Serial No.” on the label above the gas valve

Kenmore serial formats we can read

Dark = year, orange = month or week.

Confirmed A.O. Smith month/year

A03307353

January 2003.

Coverage and sources

V1 covers only the A.O. Smith-built month-letter layout. Confirm A.O. Smith on the label or documentation before decoding. Unconfirmed makers and other Kenmore layouts are excluded.

References checked 2026-10-26.

Independent reference tool, unaffiliated with Kenmore. Sources & method