GE (Rheem) or State 40 gal short gas - which one?

If your new heater uses the hex head style anode rod, you can add a second rod to the tank by using the hot water side nipple anode rod. Some of the 10 Year warranty tanks do this to help extend the life of the tank.
 
Yes, the new one has a separate hex style anode rod towards the back of the unit. I'll check it after a year. If I notice unusually high wear I will add a second one. That's a good idea.
 
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