I have an older Rheem furnace that I'm trying to narrow down how old it is. The electrical service had a tag on it dated 1973, but that doesn't mean the furnace has never been replaced.
It's a Rheem 3404-125GB, serial number XK69JN3B004 2287
Since the '2287' is off by itself, I first thought maybe it was the sequential build number.. but now I'm wondering if it's the date code.
Every place I look for Rheem serial number decoder rings says that the 4 digits after the 'F' in the number are the date code. However, my serial has no 'F'.
Any insight would be appreciated!
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