Serial Number Date Code Reference (#100)



Using the chart below, a serial number of WC9876553 would have been built in the year 2000 and in the month of March.  A serial number beginning with KA would have been built in January of 1993.  The remainder of the serial is just a sequential number.

† For the Year column, we do not use the letters: I, O, Q, R, U, V

‡ For the Month column, we do not use the letters: I, and N through Z

* Due to a computer error there were some OA serial water heaters manufactured. They were built in January of 1997.




Year of Manufacture (1st Letter of Serial Number) Month of Manufacture (2nd Letter of Serial Number)
S=2018 A=January
P=2017 B=February
N=2016 C=March
M=2015 D=April
L=2014 E=May
K=2013 F=June
J=2012 G=July
H=2011 H=August
G=2010 J=September
F=2009 K=October
E=2008 L=November
D=2007 M=December
C=2006  
B=2005  
A=2004  
Z=2003  
Y=2002  
X=2001  
W=2000  
T=1999  
S=1998  
P=1997  
N=1996