Hot water tank age chart
October 19, 2014 3:19 am
How is the hot water tank? Does it need replacing? These are some of the hot water tank questions that I am asked daily while conducting a home inspection. They are actually big questions with many different answers. The bottom line is that we should make calculated decisions to replace our deteriorating hot water tanks well before they can cause pressurized water damage to a home.
Of course, the most common indicator that the hot water tank needs to be replaced is that it is leaking. When it comes to hot water tank leaks, it’s a safe bet to say that the leak is nonrepairable and that the unit will need to be replaced. Be careful though, there have been rare times when plumbers have gone out to replace a hot water tank and what was discovered was that the leak was unrelated to failure of the tank itself and a routine fix was conducted.
How often should you replace hot water heater?
Hot water heaters can last decades without a problem, however for insurance purposes, the widely accepted reliable service life of tanked water heaters ranges from 8 to 12 years (or the published warrantied period). So your tank may appear to be operating just fine and probably is, but your insurance underwriter may require a new tank to reduce risk. Insurance underwriters tend to categorize aging water heaters differently than newer ones so ultimately it is their opinion that is the one to be recognized. If you are buying a home with an older tank, you may have to replace it to satisfy your underwriter.
How old is your hot water heater?
The reliable life expectancy of hot water heaters is usually related to inservice age. There are few consumer products that a clearly marked with a manufactured date and hot water heaters are one of them. It is safe to say that hot water heaters are installed in short order after their manufactured date. That is why most home inspection professionals determine the manufactured date of the tank as a basis to estimate inservice age, and in turn, its remaining reliable service life.
In order to find out when your water heater was manufactured look for its serial number. Somewhere in the code specific digits represent the year of manufacture.
DETERMINING HOT WATER TANK AGE CHART









Brand 
Serial # 
Key 
Alt Key 

A.O. Smith 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





ABS 
First 4 digits 
MMYY 







Ace 
First 4 digits 
YYWW 







Ace 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Agua Therm 
First 4 digits 
YYWW 







Ambassador 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





American 
First 4 digits 
YYWW 







American Hardware 
First 4 digits 
YYWW 







Apex 
First 4 digits 
YYWW 







Aqua Temp 
First 4 digits 
YYWW 







Aqua Therm 
First 4 digits 
MMYY 







Aquamatic 
First 4 digits 
YYWW 







Barnett 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Best 
First 4 digits 
YYWW 







Best Deluxe 
First 4 digits 
YYWW 







Century 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Century 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Champion 
First 4 digits 
YYWW 







Cimarrom 
First 4 digits 
MMYY 







Citation 
First 4 digits 
MMYY 







Coast to Coast 
First 4 digits 
MMYY 







Craftmaster 
First 4 digits 
YYWW 







Crosley 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





DeLimier 
First 4 digits 
YYWW 







Deluxe 
First 4 digits 
YYWW 







Eagle 
First 4 digits 
YYWW 







Earl’s Energy Saver 
First 4 digits 
YYWW 







Energy Master 
First 4 digits 
MMYY 







Energy Saver 
First 2 digits 
YM – See Bradford White 







Energy Stretcher 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Environtemp 
First 4 digits 
YYWW 







Four Most 
First 4 digits 
YYWW 







Freedom 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Freedome/Nipsco 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





General Electric 
First 4 digits 
MMYY 







Glascote 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Golden Knight 
First 2 digits 
YM – See Bradford White 







Hardware House 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Hotmaster 
First 4 digits 
YYWW 







Hotstream 
First 4 digits 
YYWW 







Intertherm & Miller 
First 4 digits 
MMYY 







Jetglas 
First 2 digits 
YM – See Bradford White 







KingCleen 
First 4 digits 
YYWW 







Kingline 
First 4 digits 
YYWW 







Knight 
First 2 digits 
YM – See Bradford White 







Lochinvar 
First 2 digits 
YM – See Bradford White 







Lowe’s 
First 4 digits 
MMYY 







Mainstream 
First 4 digits 
MMYY 







Master Plumber 
First 4 digits 
YYWW 







Master Plumber/True5 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Mission 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Montgomery Ward 
First 4 digits 
MMYY 







MorFlo/American 
First 4 digits 
YYWW 







Nationaline 
First 4 digits 
YYWW 







Nationaline 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Neptune 
First 4 digits 
YYWW 







Patriot 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Penfield 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Penquin 
First 4 digits 
YYWW 







PermaGlas 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Premier 
First 4 digits 
YYWW 







President 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Prestige 
First 4 digits 
YYWW 







Professional 
First 4 digits 
MMYY 







Proline 
First 4 digits 
YYWW 







ProlinePlus 
First 4 digits 
YYWW 







Quaker 
First 4 digits 
YYWW 







QuickFlo 
First 4 digits 
YYWW 







Raywall 
First 4 digits 
YYWW 







Regency 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Reliance 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Revere 
First 4 digits 
YYWW 







Rheem 
First 4 digits 
MMYY 







Rheem/Ruud 
First 4 digits 
MMYY 







Richmond 
First 4 digits 
MMYY 







Riveria 
First 4 digits 
YYWW 







Ruud 
First 4 digits 
MMYY 







SABH (U.S.) 
First 4 digits 
YYWW 







Sands 
First 4 digits 
YYWW 







Sentinel 
First 4 digits 
YYWW 







ServiceStar 
First 4 digits 
YYWW 







ServiStar 
First 4 digits 
MMYY 







Shamrock 
First 4 digits 
YYWW 







Special Deluxe 
First 4 digits 
YYWW 







Standard 
First 4 digits 
YYWW 







State Industries 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





State/Kenmore 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Super Eagle 
First 4 digits 
YYWW 







SureFire 
First 4 digits 
YYWW 







The Plumbery 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





ThermoKing 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Thoroclean 
First 4 digits 
YYWW 







TopLine 
First 4 digits 
YYWW 2008 + 
MYY* 2007 – 
Month – See Bradford White 





Tru Value 
First 4 digits 
YYWW 







True Value 
First 4 digits 
MMYY 







TruTest 
First 4 digits 
YYWW 







U.S. Craftmaster 
First 4 digits 
YYWW 







U.S. Supply 
First 4 digits 
YYWW 







Vanguard 
First 4 digits 
MMYY 







Vista Therm 
First 4 digits 
MMYY 







Whirlpool 
First 4 digits 
YYWW 







XCLEnergy Saver 
First 4 digits 
YYWW 





































Brand 
Serial # 
Key 


Bradford White 
First 2 digits 
YM 


















Year 
Month 






A 
1984 
2004 
A=January 






B 
1985 
2005 
B=February 






C 
1986 
2006 
C=March 






D 
1987 
2007 
D=April 






E 
1988 
2008 
E=May 






F 
1989 
2009 
F=June 






G 
1990 
2010 
G=July 






H 
1991 
2011 
H=August 






J 
1992 
2012 
K=October 






K 
1993 
2013 
L=November 






L 
1994 
2014 
M=December 






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 

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