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How can I determine the age of a Stiebel Eltron water heater from the serial number?
Wednesday, July 25, 2018
Look at the middle cluster of four digits in the serial number. Add 25 to the first two digits for the year of manufacture, and subtract 25 from the second two digits for the week. So the heat pump water heater with the serial number shown below was manufactured in the 40th week of 2014.
To determine the age of another manufacturer/brand of water heater, go to How do I determine the age of my water heater?
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