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What is a thermal expansion tank?

April 26, 2017expansion tank Thermal

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What is a thermal expansion tank?

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A thermal expansion tank is a small pressure vessel that has a rubber diaphragm installed on the inside and is filled with pressurized air on only one side of the diaphragm. When installed, water enters the other side of the diaphragm until the water pressure is equal to the air pressure. When the water pressure drops, the air pressure equalizes to the pressure of the water.