It often works in tandem with the temperature and pressure (T&P) relief valve. That is why you need a thermal expansion tank to prevent excess water pressure from damaging the water heater and other water appliances. It is not unusual for a 40-gallon water heater to expand by an extra 0.53 gallons upon reaching its set temperature. Heating the water expands its volume by 2.5% percent for every increase of 100 degrees Fahrenheit. Thermal expansion tanks are smaller than water heaters because they only serve to accommodate excess water pressure coming from the water heater. You can complete the project in an hour or two, depending on your plumbing knowledge and availability of the following things. Check your work before restoring power to the water heater.Īdding a thermal expansion tank to your water heater is less complicated than it sounds. Connect the pipe supplying cold water to the tee fitting. Install the water heater expansion tank pipe. Secure a dielectric union in the water heater’s cold water inlet port. Prepare the area for mounting the expansion tank. Look for the water pipe supplying cold water to the water heater. Turn off the water and power supply to the water heater. Steps for Installing a Thermal Expansion Tank.
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