Determine the Age of Your Water Heater

This article is a quick reference guide for the most common manufacturers of water heaters.  Unfortunately most manufacturers of water heaters do not clearly state the manufacture year on the data plate or label but luckily the year of manufacture is typically coded in the serial number.  By referencing the manufacturer below with the serial number the age of the equipment can be determined in most cases.

Manufacturers have been inconsistent over the years with their labeling which is why buyers should verify this information by following up with the manufacturer.  A lot of information can be included in the serial number including month of manufacture, day of manufacture, manufacture plant, type of unit and more.  When it comes to determining the life expectancy of a unit we are most interested in the year of manufacture which is the focus of this article.

Water Heaters typically have a 15-20 year life expectancy.  Their service life can be extended by replacing the heating elements and other components.

AO Smith

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for AO Smith water heaters is encoded in the the serial number.

YY77X7777777  (1st and 2nd numbers of serial number indicate the year of manufacture)

Note: Older units may have additional letters before the 1st and 2nd numbers

Apollo

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for Apollo water heaters is encoded in the the serial number.

XYYX77777 (1st and 2nd numbers of serial number indicate the year of manufacture)

Note: Older units may have additional letters before the 1st and 2nd numbers

Bradford White

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for Bradford White water heaters is encoded in the the serial number.

YX7777777 (The 1st letter of the serial number indicates the year of manufacture)

A=2004  B=2005  C=2006  D=2007  E=2008  F=2009  G=1990/2010  H=1991/2011  J=1992/2012  K=1993/2013  L=1994/2014
M=1995/2015  N=1996/2016  P=1997/2017  S=1998/2018  T=1999/2019  W=2000/2020  X=2001/2021  Y=2002/2022  Z=2003/2023

Craftmaster

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for Craftmaster water heaters is encoded in the the serial number.

YY7777777 (1st and 2nd numbers of serial number indicate the year of manufacture)

General Electric (GE)

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for General Electric water heaters is encoded in the the serial number.

77YY000000       (3rd and 4th numbers of serial number indicate the year of manufacture)
XX77YY777777   (3rd and 4th numbers of serial number indicate the year of manufacture)

Gas units:  GENG 77YYX77777  (3rd and 4th numbers of serial number indicate the year of manufacture)

Navien

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for Navien water heaters is encoded in the the serial number.

7777XYY77777777        (5th and 6th numbers after a letter of serial number indicate the year of manufacture)
7777XYYX7777777        (5th and 6th numbers after a letter of serial number indicate the year of manufacture)
7777-YYYY7777-7777  (5th, 6th, 7th and 8th numbers of serial number indicate the year of manufacture)
7777-YYYY-777-7777  (5th, 6th, 7th and 8th numbers of serial number indicate the year of manufacture)

Rheem/Ruud

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for Rheem/Ruud water heaters is encoded in the the serial number.

X77YYX7777777777X        (3rd and 4th numbers after a letter of serial number indicate the year of manufacture)

Tankless   YY.77-777777    (1st and 2nd numbers after a letter of serial number indicate the year of manufacture)

Rinnai

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for Rinnai water heaters is encoded in the the serial number.

2009 and later  Y7. CA-777777   (1st letter of serial number indicates the year of manufacture)
A=2009  B=2010  C=2011  D=2012  E=2013  F=2014  G=2015  H=2016  J=2017  K=2018  L=2019  M=2020  N=2021  P=2022  Q=2023

before 2009    YY. 77-77777       (1st and 2nd numbers of serial number indicate the year of manufacture)

State Industries

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for State Industry water heaters is encoded in the the serial number.

YY77X777777  (1st and 2nd numbers of serial number indicate the year of manufacture)
— or —
XYY77  X777777 (1st and 2nd numbers after first letter)

Whirlpool

Y=year of manufacturer  X=letter  7=numbers
The year of manufacture for Whirlpool water heaters is encoded in the the serial number.

YY77X777777  (1st and 2nd numbers of serial number indicate the year of manufacture)

Note:  Serial number may or may not have a letter.  

Share This:
Facebook
Twitter
Reddit
Pinterest
Email
Print
Builder Buddy Inspections & Testing

CALL 828 484 6494
OR E-MAIL
Builder Buddy LLC

Buying a Neglected Home

What is a Neglected Home? Neglected Homes, also known as ‘Fixer-Uppers’, have experienced long periods without basic maintenance and repairs.  In a typical Neglected Home

Read More »