The first two numbers of the serial number of a State water heater are the year of manufacture. Newer State water heaters, like the one shown below from 2013 also list the "BUILD DATE" below the serial number so there's no interpretation necessary; but, for older ones, you will have to depend on the serial number.. 2. Determine the Production Sequence: The remaining characters represent the production sequence within the manufacturing year.For instance, a serial number "051234" indicates that the water heater was the 1234th unit produced in 2005.. Locating the Serial Number. The serial number is typically located on a label affixed to the water heater's exterior.
Most manufacturers of water heaters do not clearly state the manufacture year on the data plate or label but luckily the year of manufacture is typically coded in the serial number. By referencing the manufacturer below with the serial number the age of the equipment can be determined in most cases. The year of manufacture for Bosch water.. Verify warranty details for our water heaters. Start with our product selector for quick access to residential or commercial information.