· what is a water heater t & p relief valve ? · wondering how to replace a pressure relief valve on your water heater ? A water heater t & p relief valve is a safety feature that will prevent or relieve overheated water and pressure. Temperature and pressure relief valves are used in residential and commercial water heater and hot water storage tank applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters. · a water heater temperature and pressure relief valve ( t & p valve ) is a crucial safety component that helps prevent the buildup of excessive pressure and temperature inside a water heater. Locate your water heater ’s essential t & p relief valve. On the very top or on the side of your hot water tank is a brass valve called a temperature and pressure relief valve , or t & p valve for short. Without a relief valve during an unsafe condition, the tank pressure would rise to the point the tank may rupture or explode. Follow our easy step-by-step guide to keep your home safe and avoid potential disasters. · learn what a water heater t & p relief valve is, how to install a t & p valve , and how to troubleshoot t & p relief valve problems. This t& p valve is an emergency safety device that prevents or relieves excessive temperature or pressure. Learn how it prevents catastrophic failure and how to test it safely.