MM = month of manufacture YY = year of manufacture P = plant identifying code nnnn = a consecutive serial number for your individual unit.Īmbassador water heaters, American water heaters, ACE water heaters, A.O.Smith water heaters, Apollo, Aqua Temp, Aqua Therm, Best water heaters, Bosch water heaters, Bradford White, Cafos, Champion, Crosley, Energy Saver, Envirotemp water heaters, GE water heaters, Glascote water heaters, Golden Knight water heaters, GSW, Hotpoint water heaters, JC Penny, Jetglas, JW or John Wood, Kenmore water heaters (Sears Brand), Lochinvar, Lowes, Mainstream, Maytag water heaters, Montgomery Wards, Knight, PermGlas, Reliance water heaters, Revere, Rheem water heaters, Rheem/Rudd/Richmond water heaters, Rinnai, Security, Shamrock water heaters, Standard water heaters, State/Reliance/Sears brand water heaters, Thermo-King, Vanguard water heaters, US Craftsmaster, US Water Heaters, and Whirlpool water heaters. Read below how to determine the age of your unit. Each manufacturer uses different formats and you need to de-code the water heater serial number. But now I'm wondering if it's the date code. It's a Rheem 3404-125GB, serial number XK69JN3B004 2287 Since the '2287' is off by itself, I first thought maybe it was the sequential build number. The electrical service had a tag on it dated 1973, but that doesn't mean the furnace has never been replaced. I have an older Rheem furnace that I'm trying to narrow down how old it is. A serial number starting with 0193, for example, may have. The first two digits can be the week of the year that the unit was manufactured, with the third and fourth number indicating the year.

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The date of production/manufacture or age of Rheem® Water Heater(s) can be determined from the serial number.

Rheem furnace serial number reader