湯沸かし器 ゆわかしき Also written 湯沸器, 湯沸し器 Meanings Noun water heater; water boiler Kanji 湯 hot water. Read as ゆ. 沸 boil. Read as わかす. 器 device. Read as キ. Words containing 湯沸かし器 瞬間湯沸かし器 (しゅんかんゆわかしき) instantaneous water heater Jinuma: Japanese Dictionary · Word lists