Raritan Magnesium Anode f/12 & 20-Gallon Water Heater

The Raritan Magnesium Anode for 12 and 20-Gallon Marine Water Heaters is essential corrosion protection for any boater or angler running hot water systems aboard. After years on the water, you know that saltwater and brackish environments aggressively attack metal components—and your water heater tank is no exception.

This sacrificial anode does exactly what its design intends: it corrodes preferentially instead of your tank, extending the service life of your heating system by years and preventing costly tank replacement. Magnesium anodes work through galvanic corrosion chemistry: the anode material is more chemically active than the steel tank, so it oxidizes first while the tank remains protected. The Raritan anode is specifically engineered for 12 and 20-gallon water heater models, matching tank volume to ensure adequate surface area and sacrificial mass.

At just 0.75 lbs and measuring 16 inches in length, it installs vertically into the tank's top opening without modification. Raritan's proven marine-grade construction and precise fit mean no compatibility guesswork—this anode threads directly into your existing tank connection point. Any serious boater or liveaboard angler who runs a Raritan water heater system should replace the anode every 2–3 years, depending on water salinity and usage.