Current tank is 23 years old, 40 gal., 33K BTU. Starting to see dripping from the top of the tank, insulation at top is wet, visible at the anode tube opening, Anode tube was never replaced. I assume it's time to replace the tank. Never had issues with insufficient hot water. So the question is, while probably sticking with a 40 gal tank, should I get a 34K or 40K BTU tank?
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