Manufacturer

Brand

Serial # Ex.

Key

American

(Prior to 2001, American was owned by GSW Corporation and manufactured water heaters for nearly 50 different brands. American was acquired by A.O. Smith in 2001 and currently only manufactures American, American-Pro-line, Premium Plus, U.S. Craftmaster and Whirlpool brand water heaters.)

American

9746******

(46th week of 1997)

American uses a 2-digit year followed by a 2-digit week

Craftmaster

Mor-Flo/American

SABH (U.S.)

U.S. Craftmaster

Ace

American Hardware

Best

Best Deluxe

Apex

Aqua Temp

Agua Therm

Aquamatic

Champion

De-Limier

Deluxe

Eagle

Earl’s Energy Saver

Environtemp

Four Most

Hotmaster

Hotstream

King-Cleen

King-line

Master Plumber

Nationaline

Neptune

Penquin

Premier

Prestige

Proline

Proline-Plus

Quaker

Quick-Flo

Raywall

Revere

Riveria

Sands

Sentinel

Service-Star

Shamrock

Special Deluxe

Standard

Super Eagle

Sure-Fire

Thoro-clean

Tru-Test

Tru Value

U.S. Supply

Whirlpool

XCL-Energy Saver

Manufacturer

Brand

Serial # Ex.

Key

A.O. Smith

A.O. Smith

Old is *H06****** (August 2006).

Since about 2008

0805AXXXXXX

Prior to 2008, the 2nd letter in the series is the month followed by the 2-digit year. A thru N = Jan thru Dec (excludes I).

Since 2008, they use an 11- digit alpha-numeric serial number. The first two positions are the year followed by a two

digit week.

Glascote

PermaGlas

Bradford-White

Bradford White

D*******F

(June 1967)

CJ*******

(Sept 1986)

B-W uses a 20-year letter code cycle to designate the year.

The first letter is the year and the second is the month.

Letter A = 1964, 1984 and 2004 A thru N = Jan thru Dec

(Excludes I, O, Q, R, U & V)

Jetglas

Lochinvar

Lochinvar

Energy Saver

Golden Knight

Knight

Rheem

Rheem

0794****** (July 1994)

or

0794F***** (July 1994)

Rheem uses a 2-digit month followed by a 2-digit year

Ruud

Rheem/Ruud

Richmond

Vista Therm

Citation

Aqua Therm

Energy Master

Vanguard

Cimarrom

Coast to Coast

Lowe’s

Servi-Star

True Value

ABS

Intertherm & Miller

Mainstream

Montgomery Ward

General Electric

Professional

State Industries

(State industries was acquired by A.O. Smith in 2008. A.O. Smith now uses this code.)

State/Kenmore

0904*******

(April 2009)

C05*******

(March 2005)

Prior to 2008, state used a 1- letter month followed by a 2- digit year

A thru N = Jan thru Dec (Excludes the letter I)

Beginning 2008, state uses an 11-digit alpha-numeric serial number. The first two positions are the year followed by a two digit week. Position 5 is a letter followed by 6 numbers.

Reliance

Ace

Ambassador

Barnett

Century

Crosley

Energy Stretcher

Freedom

Freedome/Nipsco

Hardware House

Master Plumber/True5

Mission

Nationaline

Patriot

Penfield

President

Regency

Century

The Plumbery

Thermo-King

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