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

The Raritan Magnesium Anode for 12 and 20-Gallon Water Heater is a purpose-built replacement anode rod designed to protect Raritan marine water heater tanks from corrosion and rust degradation. Magnesium anodes function through sacrificial corrosion—the magnesium erodes preferentially instead of the steel tank, extending the operational lifespan of the water heater in saltwater and brackish environments where corrosion pressure is highest.

This replacement anode measures 16-1/8 inches in length and is fitted with a stainless steel connector, delivering reliable corrosion protection across both 12-gallon and 20-gallon Raritan heater models. The magnesium composition is optimized for marine applications where freshwater anodes alone prove insufficient. Routine anode replacement maintains the tank's structural integrity and prevents pinhole leaks that can compromise systems in offshore, coastal, and high-salinity conditions.

This anode is essential for boat owners, marine facility operators, and anyone maintaining Raritan water heaters in saltwater or brackish service. Because magnesium anodes deplete over time—typically requiring replacement every 2–5 years depending on water salinity and usage—keeping genuine Raritan replacement anodes on hand ensures water heater longevity without unexpected downtime. The stainless steel fitting resists galvanic corrosion where it meets the tank, ensuring the anode seats securely across multiple service intervals.

Proper anode maintenance is a core preventive practice in marine systems engineering. Using OEM-specification anodes rather than universal substitutes ensures the anode's electrochemical properties match the tank's design, preventing galvanic mismatch that can accelerate corrosion instead of stopping it. This Raritan magnesium anode (MPN 1790010) is the correct factory-approved component for these heater sizes.