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AO Smith Serial number longer than 10 digits


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I have a 81 gal 154,000 btu A O Smith hot water heater I need help finding the age of. It looks like it was recently installed (2years) but, I used Mike trusty age chart and this serial number is longer than the charts coding. Serial number MMO1-1353893-110. Does anyone have a new date formula?

Thanks for the help.

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81 gallon - 154,000 Btu? That's a commercial unit. I'd suggest giving A.O. Smith's commercial division a call in the a.m. and ask someone there to email you a copy of whatever document they have that explains how to decode the serial numbers on their commercial units and then we can add it to the chart.

IF I remember to do so, I'll call 'em too.



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