エコノマイザーエコノマイザーMeanings1nouneconomizer (boiler component)Technical term in boiler engineering; a heat exchanger that preheats feedwater using waste heat from flue gases.ボイラーのエコノマイザーが故こ障しょうすると、燃ねん料りょう消しょう費ひが増ふえる。If the boiler's economizer breaks down, fuel consumption increases.