What does a pressure relief valve do in a home plumbing system?

A pressure relief valve protects your plumbing system by automatically opening when water pressure gets too high, then closing once pressure drops. It helps prevent burst pipes, damage to water heaters and leaks by safely discharging excess pressure to a drain line or safe discharge point.

How do I choose the right pressure relief valve and regulator size?

To choose the right pressure relief valve and regulator size, match the valve inlet size to your pipe diameter, check the pressure rating against your system’s maximum pressure, confirm temperature rating, and review flow capacity. Always follow local code requirements and the appliance manufacturer’s specifications.

Where should a pressure relief valve be installed on a water heater?

A pressure relief valve should be installed directly on the designated port on the water heater tank, usually near the top or side. The discharge outlet must connect to a rigid or approved drain line, sloped downward, terminating near a floor drain or approved location per local plumbing code.

How can I tell if a pressure relief valve or regulator is failing?

You can tell a pressure relief valve or regulator is failing if it constantly drips, will not reset after lifting the test lever, shows visible corrosion, or your system pressure fluctuates wildly. If you notice any of these signs, depressurize the system and replace the valve or regulator promptly.