Anode rod Biawar 21 x 510 mm 3/4" for water heaters (model 22171)

Magnesium anode rod Biawar 21 x 510 mm with 3/4" thread is designed to provide electrochemical protection for water heaters and storage tanks. The rod reduces internal corrosion by acting as a sacrificial anode: magnesium preferentially oxidizes instead of the steel tank, slowing rust formation and helping to preserve the heater’s inner surface. This model is intended for replacement during routine maintenance of compatible boilers and electric water heaters that accept a 3/4" anode connection.

Advantages

The Biawar magnesium anode offers a uniform composition and a length suitable for many standard-sized water heaters, enabling effective protection across a significant portion of the tank’s interior surface. Its threaded 3/4" connection allows straightforward installation or replacement without specialized tools in most cases. By sacrificing magnesium rather than the tank, the rod helps extend the service life of the water heater and reduces the frequency of more invasive repairs or tank replacement.

Suitable for (tasks / use cases)

• Replacement of depleted anode rods in electric water heaters with a 3/4" connection
• Routine maintenance to reduce corrosion inside storage tanks and boilers
• Protecting domestic hot water systems in residential buildings

Key specifications

• Material: magnesium sacrificial anode
• Diameter: 21 mm
• Length: 510 mm (total rod length)
• Thread size: 3/4" male thread for standard heater fittings
• Compatibility: intended for use in water heaters and storage tanks designed to accept a 3/4" anode

How to use

Shut off the water supply and power to the heater before beginning work. Drain sufficient water from the tank to lower the water level below the anode opening. Unscrew the old anode rod from the heater and remove it for inspection; if heavily corroded or depleted, replace it with the Biawar anode. Apply a suitable sealant or tape on the 3/4" thread if required by the heater manufacturer, then screw in the new anode rod until hand-tight and finish with a wrench if necessary. Refill the tank, restore power, and check for leaks around the connection.

Usage recommendations

Inspect the anode rod at regular intervals (typically annually) and replace it when more than 50% consumed or when heavy corrosion is visible. Water chemistry and heater usage affect consumption rate; soft or aggressive water may require more frequent inspection. Follow the heater manufacturer’s safety and maintenance guidelines when installing the anode.