Frequently Asked Questions (FAQ) about Temperature and Pressure Relief Valves

Sunday, November 14, 2021

It’s been called a “water heater pop-off valve,” “overflow valve,” “TPR valve,” or “T&P valve.” Use whatever nickname you like, but the important thing to remember is that the temperature and pressure relief valve is a critical safety device that keeps the water heater from exploding like a bomb and then shooting through the roof if its thermostat fails. Here’s a collection of our articles about the gadget which prevents that from happening:

 Can a Temperature and Pressure Relief (TPR or T&P) valve be mounted to discharge horizontally?  

 Can the temperature and pressure relief (TPR) valve discharge pipe for a mobile/manufactured home water heater terminate under the home? 

 Does a tankless water heater require a pressure relief valve?

 What does it mean when a water heater Temperature/Pressure Relief (TPR) discharge pipe is "trapped"? 

 What are the most common installation mistakes with water heater replacement?

• What's the valve with the flip-up handle on the water heater for?

• Can a water heater Temperature/Pressure Relief (TPR or T&P) valve to mounted to discharge upward? 

What are the code requirements for the discharge piping from a Temperature-Pressure Relief (TPR) valve at a water heater? 

Can you use PVC pipe for the water heater temperature pressure relief (TPR) discharge pipe?

What is the small pipe on the side of the house that is dripping water? 

• Can a water heater and air conditioner use the same drain?

Can you use PEX as discharge pipe at water heater temperature and pressure  relief (TPR) valve?

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