What type of valves are required to protect appliances and equipment used for heating water?

In plumbing systems, particularly for water heating appliances, safety mechanisms are critical to prevent excessive pressure and temperature, which can lead to dangerous situations. The required valves for this purpose are both pressure-relief and temperature-relief valves.

A pressure-relief valve is designed to automatically discharge water when the pressure inside the water heating system exceeds a certain threshold, preventing potential ruptures or ruptures of the tank or piping due to excessive pressure buildup.

On the other hand, a temperature-relief valve serves to open and discharge water if the temperature within the system rises beyond a safe level. This ensures that the water does not reach a temperature that could create an explosion hazard or lead to scalding.

Therefore, both of these valves are necessary components of a safe water heating system, ensuring that both pressure and temperature are monitored and controlled effectively. The combination of these two mechanisms is crucial for the overall safety of appliances and equipment used for heating water, making this choice the correct one.