Red Seal Appliance Service Technician Practice Exam

What is the role of an anode rod in a water heater?

1. To increase the water temperature

2. To prevent corrosion within the tank

3. To enhance pressure regulation

4. To filter impurities from water

The correct answer is: To prevent corrosion within the tank

The primary role of an anode rod in a water heater is to prevent corrosion within the tank. An anode rod is typically made of magnesium, aluminum, or zinc, and it is installed within the water heater tank. Inside the tank, the water can become corrosive due to various factors, including the presence of certain minerals and the temperature of the water. The anode rod acts as a sacrificial metal that attracts corrosive elements, effectively corroding itself instead of the interior of the tank. By doing this, the anode rod significantly extends the life of the water heater by preventing the tank material from degrading, which could lead to leaks and system failure. Routine inspection and replacement of the anode rod are recommended maintenance practices to ensure the longevity and efficiency of the water heater. Other options, such as increasing water temperature, enhancing pressure regulation, or filtering impurities from water, do not align with the specific function of the anode rod. Each of these tasks is managed through different components and systems within the water heater, demonstrating the specific and vital role of the anode rod in corrosion prevention.