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

The purpose of a relief valve in a hot water supply system is to relieve excess pressure, temperature, or vacuum. This is crucial for safety and functionality within the system. When water is heated, it expands and can create significant pressure buildup. If this pressure exceeds safe limits, it can lead to system failure or even dangerous explosions. The relief valve opens automatically to release or discharge excess pressure, helping to maintain safe operating conditions.

In addition to pressure relief, some relief valves are designed to respond to temperature increases—if the water temperature rises too high, the valve can also discharge the hot water, preventing overheating and potential damage. This preventive mechanism is an essential aspect of maintaining an efficient and safe hot water supply system.