Jerry Peck
That would be the fifth week of 1984 (84 is the year, 05 is the week). That puts it at the end of January or begining of February in 1984 or 16 1/2+ years old.
Your water heater is almost assuredly out of warranty. How long is the warranty period stated on the water heater? You would need to have a warranty longer than any I’ve seen before on a residential water heater.
I would say it is time to have a new water heater installed.
