allseason Posted February 4, 2013 Report Posted February 4, 2013 I came across this web site on the NJ ALPHI web site. It has some good info on date codes for hvac and water heaters. http://www.buildingcenter.org/
Neal Lewis Posted February 4, 2013 Report Posted February 4, 2013 Yup, I've found this site most useful, especially with the York, Universal Product Group units. The example actual photgraph of the serial numbers is a bonus.
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