Anodes are designed to corrode and dissolve to protect the interior water heater tank against electrolysis damage. To assure that the anode is performing the job for which it is designed, replace the anode no less than one time per year. During frequent motorhome use, replace the anode every six months.

Prior to performing any work on the water heater, including replacement of the anode, turn off the breaker to the water heater system, switch off the primary gas valve and disconnect the electrical and water supplies to the motorhome. Allow water remaining inside the water heater tank to cool.

Access the water heater through a service compartment located outside the motorhome. This small latching door protecting the water heater includes a small screen that should be regularly cleaned of debris to insure proper airflow to the water heater.

Open the pressure-temperature relief valve. Drain the remaining water from the tank. To remove mineral deposits that have built up on the bottom of the water heater tank you can use a flushing tool, available at camping supply outlets.

Use a 1-¼ inch socket to remove the old anode. Anodes are approximately one-inch diameter; so don't be surprised to discover that there is little more than a small bit of remaining anode. Install the new anode. Avoid coating the anode rods with Teflon tape. The rod should be bare to attract corrosive materials away from the tank walls.

Not all brands of water heaters installed in motor homes include an anode. Suburban water heater tanks are generally made from steel and utilize an anode system. Atwood water heater tanks are commonly made from aluminum and are not designed for anode use. To find out if your motorhome water heater tank utilizes an anode, consult the owner's manual or contact Technical Support. Do not add anodes to non-anode water heater tank systems and risk voiding the water heater warranty.

Fill the water heater tank prior to dry camping to help conserve on fresh water tank supplies. Empty the water heater tank prior to putting the motorhome into long-term storage. During winterization procedures, turn the water heater valves to Bypass in order to divert antifreeze away from the tank.