Red Seal Gasfitter — Class A Practice Exam

What role does the temperature-pressure relief valve serve in a gas water heater?

1. It prevents excessive pressure and may discharge water if the temperature exceeds safe levels

2. It regulates the flow of gas to the burner

3. It controls the water level in the tank

4. It monitors the temperature of the incoming water

The correct answer is: It prevents excessive pressure and may discharge water if the temperature exceeds safe levels

The temperature-pressure relief valve is a critical safety feature in a gas water heater, designed to protect the unit and prevent dangerous situations. Its primary function is to prevent excessive pressure in the tank, which can occur due to overheating or a malfunction within the system. When the temperature of the water exceeds safe levels or if pressure builds up within the tank beyond prescribed limits, the valve automatically opens to discharge excess water and relieve pressure. This action helps to prevent potential explosions or damage to the water heater. Understanding this function highlights the importance of regular maintenance and checks on the relief valve to ensure it is operational. This ensures that if there is ever an anomaly within the system, the valve can perform its protective role effectively. The other options focus on functions that are not within the scope of the temperature-pressure relief valve, which is specific to safety concerning temperature and pressure levels within the water heater.