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How to determine Water Heater Age

It is hard to find the date of manufacture of Hot Water Tank, or Water Heater. Most of time they do not put the date on the plate.
But we can decode from the serial number. Let me show you how to determine the age of Hot Water Tank of different brand.

 

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

2nd 2 digits= week

8906xxx = made in the 6th week of the year 1989
Apollo Comfort Products Apollo
Bradford-White Bradford White, JetGlas Serial # – 1st 2 letters 1st letter = year starting with A as 1984,

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

JMxxx = made in the year 1992 (J) in the month of December (M)
Crispaire E-tech
GSW Water Heating John Wood, GSW, Moffat, Superflue, Medal Serial # – 1st 4 digits 1st & 2nd number = year,

3rd & 4th number = month

8901xxx = made in the year 1989 in the first month, January
Heat Transfer Products Heat Transfer
Lochinvar Energy Saver, Golden Knight, Knight
Marathon Marathon Serial # – 1st 4 digits 1st & 2nd digit = month,

3rd & 4th digit = year

0189xxx = made in the year 1989 in the first month, January
Maytag Maytag
Rheem Aqua Therm, General Electric, Hotpoint, Professional, Rheem, Vanguard, Western Auto Serial # – 1st 4 digits 1st & 2nd digit = month,

3rd & 4th digit = year

0189xxx = made in the year 1989 in the first month, January
Richmond Richmond Serial # – 1st 4 digits 1st & 2nd digit = month,

3rd & 4th digit = year

0189xxx = made in the year 1989 in the first month, January
Ruud Professional, Ruud Serial # – 1st 4 digits 1st & 2nd digit = 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), 2nd and 3rd position (numbers) = year J89xxx = made in October of 1989
Summit Manufacturing

Mortex

Sun Therm
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 Energy Conservation Water Heater, The Earl’s Energy Saver Plus, Envirotemp, Four Most, 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

2nd 2 digits= week

8924xxx = made in the 24th week of the year 1989
Vaugn Manufacturing Corp. Sepco, Hydrohot, D.W. Whitehead

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