boiler
/ˈbɔɪlə(r); `bɔɪlɚ/ n
1 metal container in which water is heated, eg to produce steam in an engine 锅炉.
2 tank in which hot water is stored, esp for central heating and other household needs 热水器（尤指为集中供暖设备及家庭其他用途供热水的）.
3 large metal tub for boiling laundry （煮衣服用的）大金属桶. Cf 参看 copper1 3.