TripFarmer wrote:

IF YOU'VE GOT TO CALL A REPAIR PERSON AND IT'S 13 YEARS OLD and you're
intending on staying there a while, you'll be better off putting a new more
efficient one in.

Trip

In article , says...

I like your premise except the last part. Who has a more
efficient one? And how would you make one electric heater
more efficient than another. Efficiency usually refers to
converstion of one energy time to another such as
electricity to heat in this case. All electric water
heaters have the same efficiency--100 percent. Some are
better insulated but even a poorly insulated one can be
cheaply retofitted to save heat loss.