Old Biscuit: we went thru this a few times before. I pointed out that stick and brick homes have water heaters. They came equipped with anode rods. People never think about them and never replace them. Usually there is no room above the heater to drop them in . That is IF you can get the old one loose anyway. I for one would not take wrench to an anode plug in a home and take the chance of breaking or maybe even destroying a working tank. The RV heater is the same thing on a smaller scale. I took mine out in 2007 in Florida because the water stunk so bad. By removing the anode it quit stinking. Anybody looking at my heater would see the bright red handle of the ball valve and see there was no anode. IF they knew there was supposed to be one . Attwood does not use and anode. Aluminum corrodes too, just not so quickly. My heater in now 11 years old and been without rod for 7 going on 8 years. If it fails i'll say too bad and buy a 10 gal one. My house had the water heater fail in 6 years. Did I like it NO. did I cry about it NO . I moved on and replaced it. But the camper did not have stinky water.