Looking at the Rheem gas models at H.D. Does the platinum model with the 12 year warranty have an additional anode vs the performance plus with the 6 year warranty? My understanding is B.W. just gives a longer warranty, no additional anode. My State heater is 18 years old. I replaced the anode rod 8 years ago and no leaks yet but want to replace it. I have a plumber friend that will put a B.W. on his account if I want to install it myself. He doesn't do them anymore, can't match the price of a national chain that does them. Not sure which way to go.