If this is the first time you’ve heard about an anode rod, chances are …. you’re in trouble. Many RV conventional water heaters require an anode rod to protect the metal tank. Water carries minerals that will eat away common metals; the anode rod lays down its life for the sake of its friends, and no greater love hath man than this.

Here’s the short version of the answer, even though it’s not quite accurate:

• Steel tanks, used by Suburban water heaters, usually require an anode rod, which should be replaced every 1-2 years or as needed.
• Aluminum tanks, used by Dometic/Atwood water heaters, usually do NOT require an anode rod.

Not sure which one you have? You can open the exterior access door of your water heater and take a peak at the data label. The manufacturer and model number of your water heater will be listed therein.