I have been building Appliage, a free appliance age finder based on serial numbers.
The interesting part is not the form. It is the date logic behind it.
A lot of appliance brands use short year codes. GE, for example, reuses year letters. Other brands use year digits that come back every ten years. If you only look at the serial number, one input can produce several possible manufacture years.
The decoder handles that by keeping the serial number logic separate from the model evidence. First it decodes the serial format. Then, if the user adds a model number, it checks model records to see whether one candidate year can be narrowed.
The sources are mostly unglamorous: manufacturer service documents, warranty PDFs, CPSC recall notices, California registry records, DOE CCMS data, ENERGY STAR, AHRI, and Natural Resources Canada. The goal is not to guess. The goal is to show the calculation and the limits.
Still a lot to clean up, but the current version covers 79 appliance, HVAC, water heater, and boiler brands.
Site: https://appliage.com/
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