The model number is 21VR75; the serial number is RHHG0898GO1213 – this makes the manufactured date December 1991; it is a 75 gallon tank, the Input BTUH (per hour) is 75,500; and it is a Natural Gas only tank. Many of the other numbers seen are for the technicians when installing or repairing the water heater.
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These Rating Plates will list the year first (yy) and then the week (XX) of that year
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