boiler
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.