What does a TPR valve do?

Temperature/pressure-relief or TPR valves are safety devices installed on water heating appliances, such as boilers and domestic water supply heaters. TPRs are designed to automatically release water in the event that pressure or temperature in the water tank exceeds safe levels.

How long do TPR valves last?

As we mentioned earlier, pressure relief valves that are properly maintained can last for up to 30 years.

What do you need to know about a TPR valve?

Where does the TPR go in a water heater?

TPR Valves and Discharge Piping. The valve should be connected to a discharge pipe (also called a drain line) that runs down the length of the water heater tank. This pipe is responsible for routing hot water released from the TPR to a proper discharge location.

What happens to water when a TPR ruptures?

If temperature sensors and safety devices such as TPRs malfunction, water in the system may become superheated (exceed the boiling point). Once the tank ruptures and water is exposed to the atmosphere, it will expand into steam almost instantly and occupy approximately 1,600 times its original volume.

When does a water heater pressure relief valve open?

If at any point the temperature or pressure reaches an unsafe level, the water heater triggers the relief valve to open and release water out of the tank until the temperature and pressure return to normal. Reasons for water discharging from the relief valve

Temperature/pressure-relief or TPR valves are safety devices installed on water heating appliances, such as boilers and domestic water supply heaters. TPRs are designed to automatically release water in the event that pressure or temperature in the water tank exceeds safe levels.

What makes a water heater release a TPR valve?

TPR valves are designed to release when the water heater becomes pressurized above 150 PSI or the water is heated in excess of 210 degrees Fahrenheit. This helps to prevent the water heater from exploding like a bomb in our home. What makes this happen?

Can a temperature and pressure relief ( TPR ) valve be mounted to discharge horizontally?

Can a Temperature and Pressure Relief (TPR or T&P) valve be mounted to discharge horizontally? While we hope you find this series of articles about home inspection helpful, they should not be considered an alternative to an actual home inspection by a local inspector.

When to use a PRV on a water heater?

Plumbing code calls for a PRV, whenever the incoming pressure is greater than 80 psi (See this question for more info). If a recently replaced T&P relief valve starts leaking again, it probably means that the relief valve is only doing it’s job; it relieving excess pressure in the water heater.