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How old is my Kenmore Water Heaters unit?

Kenmore Water Heaters is part of A.O. Smith Corp. 4 serial formats sourced across water heater.

Serial number decoder for Kenmore Water Heaters

Serial no.

Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.

Format example: 1210A002243

Kenmore Water Heaters water heater serial numbers in the 2008 to present format encode the year as digits 1-2 (YY) after optional leading S and the week as digits 3-4 (source: building-center.org).
Example: serial 1210A002243 decodes to week 10 of 2012.
Kenmore Water Heaters water heater serial numbers in the before 2010 format encode the year as digits 2-3 (YY) and the month as letter 1 (A=Jan..M=Dec, I skipped) (source: building-center.org).
Example: serial A03307353 decodes to January 2003.
Kenmore Water Heaters water heater serial numbers in the era not stated format encode the year as digits 1-2 (YY; 80 = 1980 per chart) and the week as digits 3-4 (source: building-center.org).
Example: serial 800423049 decodes to week 4 of 1980.

Decoder pages by product

before 2010 VERIFIED
A########Water Heater
2008 to present VERIFIED
####A######Water Heater, Heat Pump Water Heater, Tankless Water Heater
2008 to present VERIFIED
####A######Water Heater
era not stated PARTIAL
#########Water Heater

Official lookup: the authority

Open the official A.O. Smith lookup takes serial or reference number; returns warranty status; URL verified live

This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.

Kenmore Water Heaters is treated as sharing A.O. Smith's format because the source lists it in that family; the corporate relationship itself is an estimate.
Kenmore Water Heaters is treated as sharing Kenmore water heaters's format because the source lists it in that family; the corporate relationship itself is an estimate.
The era not stated format is only partially confirmed (PARTIAL).
No official online lookup URL was verified for Kenmore Water Heaters.
Format depends on who built it: AO Smith letter style, Rheem style, or State/Whirlpool YYWW. No Kenmore warranty lookup; kenmore.com is a retail site.