InterNACHI Water Heater Dating Chart

 

Use this chart to determine the age of a water heater tank.

Manufacturer

Trade Names

Where to Look

How to Decode

Example

American

ACE,American, American Hardware, America's Best, Apex, Aqua Temp, AquaTherm, Aquamatic, Best, Best Deluxe, Champion, Craftmaster, De-Limer, Deluxe, Eagle,The Earl's Energy Conservation Water Heater, The Earl's Energy Saver Plus, Envirotemp, Four Most, Hotmaster, Hotstream, King-Kleen, King-Line, Master Plumber, Nationaline, Neptune, Penquin, Premier Plus, Premier Plus Self Cleaning Prestige, ProLine and ProLine Plus, Quaker, Quick-Flo, Raywall, Revere, Riveria, Sands, Sentinal, Servi-Star, Shamrock, Special Deluxe, Standard,Super Eagle, Super-Flo, Supreme, Sure-Fire, Thoro-Clean, Tru-Test, Tru Value,U.S. Supply, Whirlpool, XCL Energy Saver

Serial# – 1st 4 digits

1st 2 digits = year

2nd2 digits= week

8906xxx= made in the 6th week of the year 1989

Apollo Comfort Products

Apollo

Bradford-White

BradfordWhite, JetGlas

Serial# – 1st 2 letters

1st letter = year starting with A as 1984.  This letter is on a 20-year loop.
A=1984 or 2004
B=1985 or 2005
C=1986 or 2006
D=1987 or 2007
E=1988 or 2008
F=1989 or 2009
G=1990 or 2010
H=1991 or 2011
J=1992 or 2012
K=1993
L=1994
M=1995
N=1996
P=1997
S=1998
T=1999
W=2000
X=2001
Y=2002
Z=2003
2ndletter = month with January (A) through December (M)
JMxxx= made in the year 1992 (J) in the month of December (M)
A=January
B=February
C=March
D=April
E=May
F=June
G=July
H=August
J=September
K=October
L=November
M=December

Crispaire

E-tech

Giant Factories
Giant
Date on tank label

GSW Water Heating

JohnWood, GSW, Moffat, Superflue, Medal

Serial# – 1st 4 digits

1st & 2ndnumber = year,

3rd& 4th number = month

8901xxx= made in the year 1989 in the first month, January

Heat Transfer Products

HeatTransfer

Lochinvar

EnergySaver, Golden Knight, Knight

Marathon

Marathon

Serial# – 1st 4 digits

1st & 2nddigit = month,

3rd& 4th digit = year

0189xxx= made in the year 1989 in the first month, January

Maytag

Maytag

 

Manufacturer

Trade Names

Where to Look

How to Decode

Example

Rheem

AquaTherm, General Electric, Hotpoint, Professional, Rheem, Vanguard, WesternAuto

Serial# – 1st 4 digits

1st & 2nddigit = month,

3rd& 4th digit = year

0189xxx= made in the year 1989 in the first month, January

Richmond

Richmond

Serial# – 1st 4 digits

1st & 2nddigit = month,

3rd& 4th digit = year

0189xxx= made in the year 1989 in the first month, January

Ruud

Professional,Ruud

Serial# – 1st 4 digits

1st & 2nddigit = month,

3rd& 4th digit = year

0189xxx= made in the year 1989 in the first month, January

Sears, Roebuck and Co.

Kenmore

A.O.Smith Water Products

National,A.O. Smith, Glascote, Perma-Glas

Serial# – 2nd, 3rd, 4th characters

2nd position(letter) = month (A being January through M being December)

3rd& 4th position (numbers) = year

AJ89xxx=  made in October (J) of 1989

State Industries

State

Serial# – 1st 3 characters

first letter = month (A being January through M, being December), 2ndand 3rd position (numbers) = year

J89xxx= made in October of 1989

Summit Manufacturing

Mortex

SunTherm

 

Manufacturer

Trade Names

Where to Look

How to Decode

Example

U.S. Craftsmaster

Water Heaters

Ace,American Hardware, America's Best, Apex, Aqua Temp, Aqua Therm, Aquamatic,Best, Best Deluxe, Craftmaster, De-Limer, Deluxe, Eagle, The Earl's EnergyConservation Water Heater, The Earl's Energy Saver Plus, Envirotemp, FourMost, Hotmaster, Hotstream, King-Kleen, King-Line, Master Plumber, Nationaline, Neptune, Penquin, Prestige, Pro-Line, Pro-Line Plus, Quaker,Quick-Flo, Raywall, Revere, Riviera, Sands, Sentinal, Servistar, Shamrock,Special Deluxe, Standard, Supereagle, Super-Flo, Supreme, Sure-Fire, Thoro-Clean, True-Test, Tru Value, U.S. Craftmaster, U.S. Supply, Whirlpool,XCL Energy Saver

Serial# – 1st 4 digits

1st 2 digits = year

2nd2 digits= week

8924xxx= made in the 24th week of the year 1989

Vaugn Manufacturing Corp.

Sepco, Hydrohot, D.W. Whitehead