Dometic RV Water Heater Anode Rods

What does an anode rod do in an RV water heater?

An anode rod protects the steel tank of your Suburban or Morflex water heater from corrosion by sacrificing itself to the minerals in your water supply. Note that Dometic (Atwood) aluminum-tank water heaters do not require an anode rod, they use a plastic drain plug instead. Always confirm your tank material before ordering: steel tanks need magnesium or aluminum anodes, aluminum tanks do not.

How often should I replace my RV water heater anode rod?

Inspect the anode rod at least once per season, or every 6 months for full-timers. Replace it when more than 50% of the rod material has been consumed or when the steel core wire is exposed. Hard water and high mineral content will shorten rod life. Pair anode replacement with a tank flush for best results, and stock up on supplies from our RV winterizing kits collection before storage season.

Do Dometic (Atwood) water heaters need an anode rod?

No. Dometic and Atwood gas/electric water heaters use aluminum-clad tanks, which do not require a sacrificial anode. These units use a plastic drain plug at the bottom of the tank. If you have a Suburban or Morflex water heater, you do need an anode rod because those tanks are porcelain-lined steel. Check your model number on the data plate before ordering, and browse our 10 gallon RV water heater selection if you are sourcing a full replacement unit.

Should I choose a magnesium or aluminum anode rod?

Magnesium anodes work best in soft to moderately hard water and provide stronger corrosion protection, but they degrade faster. Aluminum anodes last longer in hard water and high-sulfur conditions, and they produce less odor in the tank. If you notice a rotten-egg smell from your hot water, switch to an aluminum rod. For boondockers using tank water of variable quality, aluminum is usually the safer pick.