Magnesium Anode Biawar 22173 21×280 mm 3/4" for Water Heaters and Boilers

Magnesium Anode Biawar 22173 (21×280 mm, 3/4") is a sacrificial corrosion protection rod intended for use in water heaters, boilers and closed potable water systems. Manufactured from magnesium, the anode provides electrochemical protection by corroding in place of the steel tank, reducing rust formation and helping extend the service life of the appliance. The product fits systems with a 3/4" threaded connection and is designed as a direct replacement where the physical dimensions and thread type match.

Advantages

This magnesium anode delivers sacrificial protection to metal tanks, slowing down internal corrosion and minimizing sediment-related perforation. Its solid magnesium composition ensures a predictable consumption rate under normal water chemistry, simplifying maintenance scheduling. The standard 3/4" threaded connection and the stated rod diameter and length make installation straightforward in compatible heaters and boilers.

Suitable for

• Domestic and commercial water heaters and boilers with a 3/4" anode port
• Closed potable water systems requiring sacrificial anode protection
• Replacement of worn or depleted magnesium anodes of similar dimensions (21×280 mm)

When it may not be suitable

This magnesium anode may not be appropriate for systems that require aluminum or zinc alloy anodes, or for tanks that specify a different anode diameter, length or thread size. In water supplies with very high chloride content or aggressive chemistry, magnesium anodes can corrode rapidly and may require more frequent replacement or a different material choice.

Key specifications

• Material: magnesium (sacrificial anode)
• Rod diameter: 21 mm
• Rod length: 280 mm
• Connection: 3/4" threaded
• Intended application: corrosion protection for water heaters, boilers and closed potable water systems

How to use

Switch off power or fuel to the heater and isolate the water supply before beginning replacement. Drain enough water from the tank to access and remove the old anode from the 3/4" threaded port. Apply suitable thread sealant if required by the appliance manufacturer, then screw in the new magnesium anode until properly seated and hand-tightened or torqued to the specification provided in the appliance manual. Refill the tank, restore power or fuel, and check for leaks and correct operation.

What to consider before purchase

• Verify the anode port thread size and type on your appliance is 3/4" and compatible with this anode.
• Confirm the required rod diameter and length (21×280 mm) match the space and mounting in your tank.
• Assess water chemistry (hardness, chloride level) to estimate anode consumption rate and replacement frequency.

Usage recommendations

For effective corrosion protection, inspect the anode at regular intervals (typically annually) and replace it when the magnesium mass is significantly depleted or the rod is heavily pitted. Follow appliance manufacturer guidelines for installation torque and sealing to ensure a reliable mechanical and hydraulic connection.