RHEEM 50L Heater Maintenance.

The degree of wear of the magnesium anode can be assessed visually and by measuring its diameter. Visual Inspection: If the anode is covered with scale but still contains metallic material, it still has a useful life. If the anode is very thin or almost disintegrated, it has fulfilled its purpose and should be replaced. If only the steel core of the anode remains, it no longer protects the tank and needs to be replaced urgently. Diameter Measurement: A new anode measures approximately 18-22 mm in diameter. If it has lost more than half its thickness (less than 10 mm), it is no longer effective and replacement is recommended. Lifespan: Normally, anodes last between 2 and 5 years, depending on the water hardness. If the water is very hard (with a lot of minerals), wear is faster. I bought the sacrificial bar on Aliexpress, the thread size is 6 mm.