How Often Should You Replace an RV Water Heater Anode Rod?
An anode rod is sacrificial: it corrodes so the steel tank is less likely to. That means replacement should be based on how much material remains, not a fixed calendar alone.
Different water heaters use different tank protection
Not every RV water heater uses the same anode design, and some tank materials do not use a sacrificial anode at all. Identify the exact heater model before buying a replacement rod.
Water chemistry controls corrosion rate
Mineral content, dissolved solids and water chemistry vary by campground. Frequent travel through hard or aggressive water can consume an anode faster than occasional use on treated municipal water.
Inspect when the tank is safely depressurized and cool
Turn off heat sources, let the water cool, shut off supply and relieve pressure before removing the drain/anode assembly. Hot pressurized water can cause serious injury.
Use visual condition rather than surface appearance alone
Anodes often look rough or coated while still having usable material. Replacement decisions should focus on how much sacrificial metal remains and the manufacturer’s threshold.