allseason Posted February 4, 2013 Report Share 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/ Link to comment Share on other sites More sharing options...
Neal Lewis Posted February 4, 2013 Report Share 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. Link to comment Share on other sites More sharing options...
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