Water Heater Age

Water heater manufacturers assign a serial number to each water heater that is built. The serial number is used to determine the warranty validation and age of the hot water tank. Below is a list of how to decode some common manufacturer serial numbers.

Bradford White

Bradford White manufactured water heaters also includes the brand name JetGlas.

Bradford White uses a 20-year letter designation rotation in serial numbers. Water heaters manufactured 20 years apart will have the same serial number or “letter year” designation (i.e. A = 2004 and 1984).

Year of Manufacture
(1st Letter of Serial Number)
Month of Manufacture
(2nd Letter of Serial Number)

A=
B=
C=
D=
E=
F=
G=
H=
J=
K=
L=
M=
N=
P=
S=
T=
W=
X=
Y=
Z=

2004
2005
2006
2007
2008
2009
2010
2011
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003

A=
B=
C=
D=
E=
F=
G=
H=
J=
K=
L=
M=

January
February
March
April
May
June
July
August
September
October
November
December

Example: Serial No.GH9560506 would have been built in August 2010.

Check your warranty: 1-800-531-2111

John Wood and GSW

GSW manufactured water heaters include the brand names Moffat, Superflue, and Medal.

See rating label serial number prefix for Warranty Code. Reduced warranty period applies to Newfoundland.

Warranty Code: P  R  S  T  U  V  W   Y
Standard Warranty Years:  3  5  6  7  8  9  10  12
Reduced Warranty Years:  3  3  3  5  5  5   5    7

1.) When looking at the serial number prior to 2004 the serial numbers were read this way.

3) Between 2004 and 2007 the format for the serial numbers were read this way.

The 6th digit of the serial number represented the place of manufacture.

3.) 2008 and Later The new format for the serial numbers was implemented. There is no longer a reduced warranty for Newfoundland.

Check your warranty: 1-888-599-2837

Rheem and Ruud

Rheem manufactured water heaters include the brands Aqua Therm, General Electric, Hotpoint, Professional, Vanguard, and Western Auto.

Newer Rheem water heater serial numbers contain letters and digits. Please call Rheem directly to determine the age of your water heater.

The serial numbers on older Rheem water heater labels contain ten digits and follows the example below.

Example: Serial No. 1209D01234 would have been manufactured in December 2009.

 Serial Number  12  09  D  01234
 Description  Month Manufactured  Year Manufactured  Plant Line Code  Consecutive Serial Number

Your warranty length is based on the date of manufacture and the warranty code listed in the model number.

Check your warranty: 1-800-263-8324

General Electric

As mentioned above, General Electric water heater serial numbers are decoded in the same way as Rheem serial numbers. (The first 2 digits indicate month of manufacture, and the second 2 digits indicate year of manufacture.) However, there are a few different styles of serial numbers for these tanks.

The date of production/manufacture or age of an GENERAL ELECTRIC® water heater can be determined from the serial number. Serial number styles/formats found:

Style 1:  1108903259
First 2 digits indicate month of manufacture, second 2 digits indicate year of manufacture

Style 2:  GE 09022246884
First 2 numbers indicate month of manufacture, second 2 numbers indicate year of manufacture

Style 3:  GENG 0601D13586
First 2 numbers indicate month of manufacture, second 2 numbers indicate year of manufacture

Style 4:  RN0197147899
First 2 numbers indicate month of manufacture, second 2 numbers indicate year of manufacture

Check your warranty: 1-800-626-2005

Giant

To verify your Giant water heater age and warranty status, you can call your local Giant water heater dealer. Find your local deal on the manufacturer website here.

AO Smith

For AO Smith water heaters, including the brands National, Glascote, and Perma-Glas, the first 2 numbers in the serial number indicate the year of manufacture, and the second 2 numbers indicate the month of manufacture.

Example: Serial No. BG990813397-210 would have been built in year 99 (1999) in month 08 (August).

Check your warranty: 1-800-447-6575

American Water Heaters

2c_AWHa

American Water Heaters also include the brand names Super-Flo and Whirlpool.

To decode this serial number, look at the first 4 digits of the serial number. The first 2 digits indicate the year of manufacture, and the second 2 digits indicate the week of manufacture.

Example: Serial No. 9906xxx would have been made in the 6th week of the year 1999.

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