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How can I tell the age of an A.O. Smith tankless on-demand water heater from the serial number?
Wednesday, February 23, 2022
The first two numbers of the serial number on the data plate of an A.O. Smith tankless water heater are the year of manufacture. So the one shown below indicates 2015.
For determining the age of an A.O. Smith tank water heater, go to How can I tell the age of an A.O. Smith water heater from the serial number?
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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