How can I tell the age of an A.O. Smith water heater from the serial number?
Sunday, June 17, 2018
The first two numbers in the serial number, which may appear after one or two letters, are the year of manufacture of an A.O. Smith water heater. So the data plates shown below indicate that the water heaters were manufactured in 1989 and 2004.
To determine the age of another manufacturer/brand of water heater, go to How do I determine the age of my water heater? Also, see our blog posts How can I determine the age of a water heater if the serial number is missing or decoding it is impossible? and What are the most common installation mistakes with water heater replacement? and Are water heaters required to be raised off the floor? and What's that powdery crust on the pipe connections at the water heater?
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