瞬しゅん間かん湯ゆ沸わかし器き

noun

instantaneous water heater; on-demand water heater

A device that heats water instantly as it flows, without a storage tank. Common in Japanese homes for kitchen or bath.

• このアパートには瞬しゅん間かん湯ゆ沸わかし器きが付ついています。

  This apartment comes with an instantaneous water heater.

noun

hot-tempered person; irritable person

Colloquial metaphorical use, likening a person who quickly gets angry to a water heater that instantly produces hot water.

• 彼かれは瞬しゅん間かん湯ゆ沸わかし器きみたいにすぐ怒おこる。

  He gets angry in a flash, just like an instantaneous water heater.