![]() So, what causes the pressure-relief valve to fail? In many cases, the valve gets stuck or frozen in place due to the buildup of rust and corrosion inside the tank. If not, you’re potentially looking at a flooded home with significant and costly water damage. If your water heater has an emergency shutoff valve installed, the burst will be detected and the water supply will automatically shutoff. The results are explosive, as the tank gives way, sending hot water flooding outward. The heavy metal tank can withstand a lot of pressure buildup, but it eventually has its limits. If the pressure-relief valve is unable to open, the pressure can continue to build inside of the tank past that 100 PSI ceiling. By releasing some of the hot water and air, the valve lowers the pressure back down to safe levels.įor reference, the normal pressure of the water inside of the water heater tank is 50-100 PSI. In the event that it cannot, the pressure-relief valve triggers. Some degree of excess pressure escapes through the water pipes connected to the water heater. This expansion puts pressure on the exterior walls of the tank, but this is to be expected. The greater the heat, the more expansion that occurs. What leads to excess pressure in the tank?Īs your water heater heats up the water in the tank, the water expands and steam is generated. It’s an unheralded but essential safety mechanism for your water heater. By doing so, it can prevent excess pressure buildup that has the potential to cause a tank burst and flood your home. It’s a valve that relieves excess pressure in the water heater tank. What is the water heater pressure-relief valve? Our plumbers are available 24/7 to help you and your home! If your water heater has stopped working, fill out the form to schedule a free VIP plumbing inspection here in the Chicago area. Have a professional look at your water heater.
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