![]() ![]() There’s a butyl rubber bladder in the middle. The other half is full of compressed air. Half the tank is filled with water from the main water system of your home. Correctly installed, it absorbs such excess pressure. This is where the expansion tank comes in. No problem, however, if a check valve or pressure regulator (PRV) is installed on the pipe entering your home, all excess pressure will be trapped in your home pipe system, which will press your pipes, lamps and household appliances. This additional pressure will only be absorbed by the municipal water supply system, becoming insignificant. When a pot of water is heated on the stove, the kettle finally begins to whistle because the pressure generated inside will blow the steam.Īlthough the water in the water heater does not reach the boiling point and turns into steam, it swells when heated. How does the expansion tank of the water heater work? Usually they are the same size as basketball, depending more or less on the size of the water heater they serve. At the bottom, there is a threaded pipe connection. 7 How can I test if my thermal expansion tank is working?Ĭommon residential expansion tank looks like a small propane tank.Īt the top, it has an air valve, like the one seen on most tires called Schrader.5 What is the life expectancy of expansion tanks?.4 If there are several water heaters, do I need more than one?. ![]() 2 How does the expansion tank of the water heater work?.1 What is a thermal expansion tank like?. ![]()
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