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Ruud® Water Heater Age
The date of production/manufacture or age of Rheem® Water Heater(s) can be determined from the serial number.
Serial number styles/formats found are:
→Style 1: 0904B21710 (Serial Number begins with a prefix between one to four letters in length – i.e. R; RN; RNG; RHNG; etc.)
→Style 2: 0106534307 (Serial Number begins with a prefix between one to four letters in length – i.e. R; RN; RNG; RHNG; etc.)
→Style 3: A141511869
→Style 4: D1114A441408265A
→Style 5: 0804P000036 (Tankless Water Heater) (Serial Number begins with a prefix between one to four letters in length – i.e. R; RN; RNG; RHNG; etc.)
→Style 6: 05.05-000021 (Tankless Water Heater)
Legend: Year is RED; Month is GREEN; Week is BLUE
Style 1: 0904B21710

Style 2: 0106534307

Style 3: A141511869

Style 4: D1114A441408265A


Style 5: 0804P000036

Style 6: 05.05-000021
