Tag Archives: water heater

Temperature pressure relief (TPR) valves

Pictured here is a typical TPR (temperature-pressure-relief) valve, installed on all water heaters.  Code requires the installation of a ¾-inch solid pipe, discharging to the exterior or extending to within six (6) inches of the floor for safety reasons.  The TPR valve is designed to discharge high temperature and/or high pressure water if the water heater overheats or develops too much internal pressure.  Without a TPR valve, the water heater could literally blow up in the event of overheating or excessive pressure build-up.  The reason we extend the pipe is because, in the event that it discharges, we don’t want it discharging high pressure, high temperature water towards a person which would be a definite safety issue.   This was discovered at a recent home inspection on Shaw Island in the San Juan Islands.

Temperature-pressure-relief (TPR) valves

The temperature-pressure-relief valve (TPR) on water heaters should be extended with ¾” piping to discharge within six (6) inches of the floor, or outside the building for safety reasons.  This valve is designed to discharge if the water heater temperature or pressure become dangerously high which can prevent the water heater from rupturing/exploding.  It’s important to route this discharge valve away so it doesn’t cause harm to the home’s occupants.  This was discovered at a recent home inspection in Bellingham. 

VIDEO: Dangerous Water Heater TPR Valve Extension!

Tim Hance of All Islands Home Inspections discusses why it’s important that the TPR extension be solid piping instead of flexible for safety reasons. It’s also important that it discharge within six (6) inches of the floor for safety reasons. Thanks for watching!

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How to drain a water heater and check pressure relief valve

Most people never give their water heater a second thought – until it stops working. One thing you can do to extend the life of water heater is to drain the tank annually to remove any sediment that may have built up inside of it. DIY Network has a set of illustrated, step-by-step instructions to help guide you through the process.