expansion tank

noun

A small tank that is partially filled with air to protect closed water heating systems (not open to atmospheric pressure) and domestic hot-water systems from excessive pressure.

Similar
expansion vessel
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Meanings

nounexpansion tank (plural expansion tanks)

plural expansion tanks

  1. A small tank that is partially filled with air to protect closed water heating systems (not open to atmospheric pressure) and domestic hot-water systems from excessive pressure.

    Synonyms: expansion vessel

Synonyms & antonyms

nounA small tank that is partially filled with air to protect closed water heating systems (not open to atmospheric pressure) and domestic hot-water systems from excessive pressure.

Similar
expansion vessel
Also see
expansion vessel

Translations

Spanish vaso de expansión
  • vaso de expansiónTranslations
Cite this entry
APA

expansion tank. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/expansion%20tank

MLA

“expansion tank.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/expansion%20tank. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “expansion tank,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/expansion%20tank.

Source: expansion tank on Wiktionary, CC BY-SA 4.0.