How to Test a Pressure Valve

A pressure valve is a device installed on a home water heater to prevent it from blowing up under pressure. The pressure valve will open when the inside of the water heater's heat level rises. Pressure valves should be tested every six months. Testing a pressure valve is a straightforward procedure that you can do yourself to detect any problems early, before you have to spend thousands of dollars to replace your entire water heater.

Things You'll Need

• Bucket

Instructions

1. Look at the pressure valve on the water heater. This is found at the top, with an overflow pipe that runs down the side of the water heater. Inspect the pressure valve for large amounts of rust or corrosion, especially where the valve is attached to the water heater tank. Replace the pressure valve if necessary.

2. Put a bucket underneath the end of the overflow pipe and open the pressure valve.

3. Watch to see how much water is going into the bucket. Let the water run for at least five seconds. If the water does not flow out freely with the pressure valve opened, there is a problem and the pressure valve needs to be replaced.

References

• Inspectapedia: Guide to Hot Water Heater Temperature Pressure Relief Valves
• Facts Facts: Water Heater Pressure Release Valve