Feb 28, 2022
Understanding Your Water Heater's TPR Valve: A Small Part with a Big Job
Your water heater is a reliable workhorse, providing hot showers and clean dishes day in and day out. But like any appliance, it has safety features that require attention. One crucial component you might not be familiar with is the Temperature and Pressure Relief (TPR) valve. This unassuming little valve plays a vital role in preventing potentially dangerous situations.
What Does a TPR Valve Do?
The TPR valve acts as a safety net for your water heater. Here's how it works:
Excessive Temperature: If the water inside the tank gets too hot (typically above 210°F or 99°C), the TPR valve opens to release some of the hot water, preventing the tank from overheating and potentially exploding.
Excessive Pressure: As water heats up, it expands. If the pressure within the tank exceeds safe limits (usually 150 psi), the TPR valve opens to relieve the pressure, preventing damage to the tank or plumbing system.
Where to Find It:
The TPR valve is typically located on the side or top of your water heater. It's a brass or plastic valve with a discharge pipe that usually extends down towards the floor.
Signs of a Problem:
Water Dripping or Leaking: A small amount of occasional dripping from the discharge pipe can be normal, but a constant leak indicates a problem with the valve or excessive pressure/temperature in the tank.
No Water Discharge During Testing: If no water comes out when you test the valve (see below), it could be stuck or clogged.
Rusty or Corroded Valve: This can prevent the valve from functioning properly.
Testing Your TPR Valve:
It's important to test your TPR valve annually to ensure it's working correctly. Here's how:
Caution: The water discharged from the valve will be very hot!
Locate the valve and the discharge pipe.
Place a bucket under the discharge pipe.
Carefully lift the lever on the valve for a few seconds.
Water should flow out of the discharge pipe.
Release the lever and check for leaks.
Important Notes:
If you encounter any problems with your TPR valve, contact a qualified plumber immediately.
Never plug or cap the TPR valve or its discharge pipe.
Ensure the discharge pipe is clear and unobstructed.
By understanding the function and importance of your water heater's TPR valve, you can help ensure the safe and efficient operation of your appliance and prevent potential hazards in your home.
