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Manufacturer – A.O. Smith                                        

Style 1: (Pre 2008)
The Date of Manufacture is found in the first 3 digits of the serial number
B 06 1234567
B Month (February)
06 Year

A January     J September
B February    K October
C March        L November
D April           M December
E May            
F June
G July
H August

Style 2: (2008 Forward)
The Date of Manufacture is found in the first 4 digits of the serial number
08 10 1234567
08 2008
10 Week Ten

Permaglass hot water heaters were a line of water heaters manufactured by the American appliance company, A.O. Smith. These water heaters were known for their durable construction and reliability. The term "Permaglass" typically referred to the glass lining used inside the tank to protect against corrosion and extend the lifespan of the heater.


Permaglass water heaters were popular for residential and commercial applications due to their efficiency and ability to provide consistent hot water. They were available in various sizes and configurations, including both gas and electric models. The glass lining technology helped prevent rust and corrosion, which are common issues in water heaters over time.

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