Oklahoma Service Technician Practice Exam

The correct answer involves tasks that are integral to maintaining the efficiency and functionality of a water heater. Flushing the tank helps to remove sediment buildup, which can affect the heater’s performance and lifespan. Checking the anode rod is essential as it performs a critical role in preventing corrosion inside the tank; if it is depleted, it should be replaced to ensure the long-term operation of the water heater. Inspecting the heating elements is also vital, as these components are responsible for heating the water, and ensuring they are in good condition helps to maintain efficient heating and energy usage.

Other options, while sometimes relevant to dealing with water heaters, do not fit into the category of routine maintenance that a technician typically performs. Replacing the water heater is a more significant task that usually involves installation rather than maintenance. Increasing the water temperature settings does not constitute maintenance and could potentially lead to safety issues if the temperature is set too high. Disconnecting the power supply, while important for safety during maintenance, is not a maintenance task in itself and does not contribute to the water heater's upkeep. Thus, the first option embodies the preventive and routine maintenance responsibilities that enhance the operational longevity of a water heater.