| 摘要 |
PURPOSE:To shorten the period of time required for heating up water without reducing the space in a bathtub, by a method wherein a flat form heat exchanger is provided on a bottom surface of a bathtub, and the heat exchanger is covered by a cover. CONSTITUTION:A flat form heat exchanger 2 is provided on the bottom surface of a bathtub 1, and is covered by a cover 3. Accordingly, water in the bathtub 1 is brought into heat exchange at a bottom part of the bathtub 1, and it can be circulated from the bottom part of the bathtub 1, so that the period of time required for heating up water can be shortened, while the space in the bathtub 1 is not reduced by the heat exchanger 2. |
