How to say "furnace" in Japanese

• 窯かまCommon
  nounIts core sense is a kiln — a heated chamber for firing pottery or ceramics. Its 'furnace' sense is likewise a kiln-type industrial chamber, so it is not the word for a household heating furnace.
• 火炉かろ
  nounA technical word for a furnace, especially the furnace chamber of a boiler. It is less common, and in everyday speech it is seldom the word you want for 'furnace'.
• ファーネス
  nounA loanword taken straight from English 'furnace'. It appears in specialized industrial and technical jargon, but as a less common borrowing it is seldom the word you want in ordinary Japanese.
• 炉ろ
  nounA general word for a furnace: a structure built to contain a fire, as in metalworking. It also covers kilns, though 窯 is the common word for those.

Choose 窯 for kilns and kiln-type industrial furnaces, 炉 for a furnace as a fire-containing structure, 火炉 for technical boiler furnaces, and 「ファーネス」 only in specialized industrial jargon.

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

• 窯かまstove
• 火炉かろfurnace
• ファーネスfurnace
• 炉ろfurnace
• 竈くどhearth