What is the temperature setting for a T and P relief valve on a domestic hot water tank?

The temperature setting for a Temperature and Pressure (T&P) relief valve on a domestic hot water tank is typically set to 210°F. This temperature is chosen as a safety measure to prevent the water in the tank from exceeding safe limits. If the water temperature rises beyond this point, the T&P valve is designed to open and release excess pressure and temperature, thus reducing the risk of tank rupture or explosion.

Setting the valve at 210°F effectively balances the need for hot water availability with safety protocols. Water storage at this temperature helps ensure that the water remains hot enough for various household uses while also being below the danger threshold that could lead to catastrophic failures in the system. This specific temperature helps to maintain safe operational standards in accordance with regulatory requirements and manufacturer guidelines, making it the appropriate choice for this particular safety device.