PURPOSE: To make it possible to obtain high-temperature hot water of a uniform temperature at the upper part of a can body in a short period of time, though its quantity is small, by fitting a pipe provided with a plurality of small diameter holes in the can body from the upper hot water supply port of the can body, and arranging these holes in the peripheral direction of the can body.
CONSTITUTION: An in-can hot water outlet pipe 10A is fitted within the can body 7 from a hot water supply port 12 at the upper part of the can body 7, and a plurality of small holes 10B are arranged in the pipe 10A toward the circumferential direction of the can body 7. High-temperature hot water is discharged into water above the can body 7 through small holes 10B of the in-can hot water outlet pipe 10A to undergo heat exchange, and water whose temperature increases moves toward the upper part of the can body 7. Further, since small holes are formed in the circumferential direction of the can body 7, high-temperature hot water ejected does not advance into a position lower than the hot water pipe 10A, and is finely divided and uniform heat exchange is carried out.
FUJISHITA KAZUO
KANEKO HIDEKI
