Rheem sometimes presents the key dates in this alternate way.įor their older pre-1999 models, Rheem used weeks instead of months (as shown in example two). Rather than being the first four digits, it is displayed as the third to sixth. However, in the second example, the numerical order has changed slightly. In the first example below, the first and second digits represent the month. Their newer models (constructed after 2000) are identified by the month and the manufacture date. Rheem also adopts a simple approach for its various brands. The two following numbers indicate the year. ‘A’ equals January and ‘M’ equals December. Current models also use the same sequence.įor models after 1997 but before 2008, you should see a number followed by a letter ranging from ‘A’ to ‘M’ (excluding ‘I’). Smith uses a very basic system that should be straightforward to figure out.įor their older, pre-1997 models, they state the year and week within the first four numbers (1) in this format: YYWWxxxxxx. To help you decipher your serial number, we have put together guides for some leading manufacturers and the various brands that use their systems. Manufacturers tend to use unique patterns or formats, so you need to find your specific manufacturer or brand in order to do this. The serial number contains two important details: the month and year of construction. This is usually placed near the energy guide or warning labels. You should try to start by decoding the serial number - find the details toward the side of the heater. On older models, however, you might need to do some detective work. When Should You Replace Your Water Heater?ĭetermining water heater age is simple on most newer models - the installation date is usually recorded on the information label.
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