What is the function of the pressure relief valve in a water heater?

The function of the pressure relief valve in a water heater is to prevent excessive pressure build-up. Water heaters operate by heating water to the desired temperature, and as water is heated, it expands and can create pressure within the tank. If the pressure were to build up beyond safe levels, it could result in a dangerous situation, including the risk of the tank bursting or causing a leak.

The pressure relief valve is a safety device designed to open automatically when the internal pressure reaches a certain threshold, allowing excess pressure to escape and thus maintaining safe operating conditions within the water heater. This function is critical for ensuring that the water heater operates safely and effectively without compromising the integrity of the system.

While regulating water temperature and other functions are important in the overall operation of a water heater, the primary role of the pressure relief valve is specifically focused on pressure management. Increasing water pressure or draining excess water is not within the scope of its design, as those functions require different types of valves and systems to control.