| 摘要 |
PROBLEM TO BE SOLVED: To vary a time distance of heat insulation operation of bathtub water to improve facility. SOLUTION: A temperature difference between a bath sensor 9 before heating and the set temperature of an external input device 24 is stored. When, after elapse of a specified time, the temperature of a bathtub water reaches the set temperature of the external device 24 by a bath tub water heat insulation means 27, and when the temperature difference is higher compared with the stored value of a preceding temperature difference, the time interval of subsequent heat insulation operation of the bath tub water heat insulation means 27 is shortened, and when lower, the time interval is lengthened. |
