a natural spring that sometimes sends hot water or steam up into the air 间歇泉 - (British English)
a piece of equipment in a kitchen or bathroom that heats water, usually by gas （厨房或浴室的）煤气热水器，热水锅炉 - (South African English)
a large container in which water is stored and heated, usually by electricity, in order to provide hot water in a building （建筑物的）电热水器，热水锅炉
Word Originlate 18th cent.: from Icelandic Geysir, the name of a particular spring in Iceland; related to geysa ‘to gush’.