What is the purpose of a pop off valve for a hot water heater and how does it function to ensure safety and prevent potential hazards?

The purpose of a pop off valve for a hot water heater is to release excess pressure that builds up inside the tank, preventing it from exploding. The valve functions by opening when the pressure exceeds a safe level, allowing the hot water to escape harmlessly. This helps to ensure safety by preventing the tank from rupturing and causing potential hazards like scalding water or fires.