Whirlpool water heaters are manufactured by Craftmaster, and their coding system is that the first two numbers of the serial number are the year of manufacture. So the serial number of the water heater data plate in the photo below (circled in red) indicates that the water heater was manufactured in 2005.Click to see full answer. Furthermore, how can I tell how old my water heater is?You can determine how old your residential water heater is by looking at and decoding data on the water heater’s label. First, locate the manufacturers label with the serial number on the side of your unit. This sticker is usually around any warning labels and the energy guide.Also Know, how old is my appliance by serial number? To determine the age of your appliance, use your serial number (not model number) to find date of manufacture. Our serial numbers begin with two letters followed by six numbers. The 2 letters at the beginning of the serial number tell you the month and year it was made. Subsequently, one may also ask, where is the manufacture date on a hot water heater? Locate the manufacturer’s label and serial number on the side of your water heater. The sticker is generally above the heater’s warning labels and next to the energy guide. Check to see if the installation date is listed on the sticker.How many years does a water heater last? 8 to 12 years

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