deaerator

/diːˈɛrˌeɪtər/
noun
  1. A device or machine that removes air or gas from a liquid, especially water.
    • The technician checked the deaerator for any leaks before starting the process.
    • A deaerator helps improve the efficiency of heating systems by eliminating trapped air.
    • The power plant uses a deaerator to remove oxygen from the boiler feedwater.
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