Time to replace water heater?
The house we just bought seems to have a water heater that is 21 years old. It is a 62 gal Rheem-Ruud gas WH the also operates an AquaTherm heating system for the house. It seems ok, but there is some rust spots and paint peeling spots on the outside of the tank. This is partly caused by pretty high humidity in the tank cabinet, but I'm thinking a WH this old is just asking for trouble. Opinions?