When boiling a pot of water on the stove with a lid on tight, the water gets hotter, and the steam begins to push against that lid. The pot rattles and shakes because the energy has nowhere to go. Your home’s water heater works in a similar way. Since the tank is sealed, it could actually burst or turn into a rocket if the temperature or pressure increases too much. To prevent a disaster that could damage your home or hurt your family, engineers added a small but vital part called the Temperature and Pressure Relief valve. You might see it as a little brass lever on the side or top of your tank with a pipe pointing toward the floor.
Acting Like a Steam Engine Safety Switch
You may have learned in physics class that water takes up more space as it heats up. This is a natural process. However, in a closed system like your plumbing, that extra volume creates intense pressure against the walls of the tank. The relief valve is set to open automatically if the internal pressure hits a specific limit. This is usually around 150 pounds per square inch. When the valve opens, it spits out a little bit of water and air to lower the stress inside the metal container. If you ever walk past your water heater and see a small puddle on the floor under that discharge pipe, it might mean the valve did its job to save the tank from failing and causing a huge disaster.
Preventing a Dangerous Household Explosion
While it sounds like something out of a movie, a water heater without a working valve can actually explode with enough force to level a portion of a house. When the water inside the tank reaches the boiling point but cannot turn into steam because it is trapped, it becomes superheated. If the tank finally cracks under that pressure, all that water turns into steam instantly, expanding over a thousand times its original size in a split second. This massive blast of energy is exactly what the safety valve is built to stop by giving that pressure an easy exit route. By releasing a small amount of hot water early, the valve ensures the tank stays whole and your home remains standing.
It is essential to have a plumber come and check if this valve works as intended. You should schedule a water heater inspection once annually. As part of this inspection, the plumber will test this valve to make sure it functions optimally. If they find that this valve malfunctions, they will replace it. Sure, inspections cost money; however, you will spend far more to replace your water heater and repair the damage to your home. When you need water heater services in Waukesha, WI, contact Jeff’s Custom Care.