AC (alternating current) Power is the same power type used in your home (110 to 120 volts of 60 cycle/hertz alternating current). AC power for an RV is also referred to as Shore Power - a term also used in a Marine environment. In your RV, several items are powered exclusively from AC Power. Such as:
For Suburban brand water heaters:
Suburban water heaters feature an anode rod. The anode equalizes aggressive water action, providing cathodic protection for the tank. All Suburban water heaters are protected by a magnesium or aluminum anode to prolong the life of the tank. Under normal use, the anode rod will deteriorate. Because of this, we recommend it be replaced annually or when consumption or weight loss of the rod is greater than 75%. Water with high levels of iron and/or sulfate will increase the rate of deterioration. To extend anode life, drain water from tank whenever the RV is not being used. Avoid any extended time of non-use with water in the tank.