The temperature and pressure relief valves are an essential safety feature of your water heater. They are designed to go off anytime that there is an increase in water system pressure. For example, they should go off when the unit starts to heat the water since the pressure inside the tank will increase as the water expands. Without a working temperature and pressure relief valve, your water heater would essentially become a bomb if the pressure inside the tank were to get too high.
If you do not have a pressure-reducing valve on your main line, the water will expand into the city water supply in order to relieve the pressure. If your home is equipped with a pressure-reducing valve, you should install an expansion tank that can absorb the excess pressure. Pressure-reducing or backflow prevention valves are common in homes renovated or built within the past 10 to 20 years. They are designed to keep water entering the house from flowing back out into the water supply system. That means that the extra water inside the water tank has no place to go, which allows the pressure to build to the point that the water escapes out the discharge tube. An expansion tank is installed in the cold water line between the tank and the backflow value so that the water has somewhere to go. Our professional technicians are happy to take care of this task for you.
If the above steps do not resolve the problem, it could mean that the water pressure coming in from the main supply is too high. Residential water pressure should be between 50 and 70 psi. Pressure above 80 psi can strain your supply lines and appliances. You can solve the problem by installing a pressure regulator on the incoming water line along with an expansion tank.