"JB" wrote in message
oups.com...
My 40 gal gas water heater is about 13 yrs old. Water is hot and it
works fine. The only sign of age is exterior paint starting to flake
off with rust underneath. (Its kind of strange...the flake bits are
perfectly round...like tiny polka dots.)

What is the average life of a gas water heater? I don't want to
replace a perfectly good heater with lots of life left, but I don't
want to play Russian roulette and come home from work one day to a
swimming pool in my basement!

What are the signs that its time for it to go?

If you see a leak, it is gone. If you suddenly get a lot of rusty water, it
may be going fast. That said, I sold my last house and the water heater was
20 years old.