Celebgol

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 # – 1^st 4 digits

1^st 2 digits = year

2^nd 2 digits= week

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

Apollo Comfort Products

Apollo

Bradford-White

Bradford White, JetGlas

Serial # – 1^st 2 letters

1^st letter = year starting with A as 1984,

2^nd 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 # – 1^st 4 digits

1^st & 2^nd number = year,

3^rd & 4^th 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 # – 1^st 4 digits

1^st & 2^nd digit = month,

3^rd & 4^th 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