Suburban Water Heater Part - Magnesium Anode RodThe Suburban Anode Rod attracts corrosive elements in your water protecting your heater tank from corrosion. The anode rod is the most important factor in determining the life of your water heater. The magnesium of the anode is less noble than the steel of the tank meaning it will corrode instead of your tank. Normally an anode rod will last you 4 5 years, if you are using water with a high mineral content the lifespan will be shorter. Benefits &