How to say "boiler" in Japanese

• ボイラーCommon
  nounThe common, default word for a boiler: a device that heats water or raises steam in a building, factory, or ship. Use this unless you have a specific reason not to.
  ボイラは湯ゆあかがびっしりついた。↗

  The boiler was heavily scaled.
• 缶かま
  nounNative word for a boiler in the sense of a kettle-like vessel for heating water. It is less common than ボイラー, which is the ordinary choice for boilers.
• 汽缶きかん
  nounA steam boiler — the characters literally mean 'steam vessel'. It refers to a boiler that raises steam for an engine, as on a ship or locomotive, and is less common than ボイラー.
• 火炉かろ
  nounThis word really denotes a furnace or hearth for burning fuel; 'boiler' is at most a secondary sense, so it is seldom the word you want when translating boiler.
• 沸かし器わかしき
  nounA descriptive word, literally a 'boiling device': an appliance that heats water, such as an urn for hot water. It is less common than ボイラー, the default word for boilers.

Choose 「ボイラー」 for a boiler in general; かま and きかん are less common words for kettle- and steam-type boilers; わかしき names a hot-water appliance, while 火炉 is really a furnace.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• ボイラーboiler
• 缶かまboiler
• 汽缶きかんboiler
• 火炉かろfurnace
• 沸かし器わかしきurn (for hot water)
• 給湯器きゅうとうきwater heater