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An expansion tank or expansion vessel is a small tank used to protect closed water heating systems and domestic hot water systems from excessive pressure. The tank is partially filled with air, whose compressibility cushions shock caused by water hammer[citation needed] and absorbs excess water pressure caused by thermal expansion.[1]
- ^ Boyle Schwartz, Donna (16 April 2014). "Expansion Tanks: What Are They and Why Are They Important?". bobvila.com. Retrieved 26 September 2022.