Expansion tank

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

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 absorbs excess water pressure caused by thermal expansion and cushions shock caused by water hammer.

Excerpt from the Wikipedia article “Expansion tank”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: User:Jahoe, Public domain, via Wikimedia Commons.