What is the purpose of a pressure relief valve in a hot water system?

The purpose of a pressure relief valve in a hot water system is to prevent excessive pressure build-up. When water is heated, it expands and increases in pressure. If this pressure is not regulated, it can lead to potential hazards such as the bursting of pipes or tanks, which can result in significant damage and safety risks. The pressure relief valve acts as a safety mechanism that opens to release excess pressure, ensuring that the system remains within safe operating limits. This helps maintain the integrity of the hot water system and protects both the equipment and occupants of the building from the dangers associated with high pressure.

In contrast, regulating water temperature, controlling water flow rate, and improving energy efficiency are different aspects of hot water system management that do not directly relate to the function of a pressure relief valve.