| 摘要 |
PURPOSE:To securely carry out additional heating by a method wherein a set time until the additional heating operation is effected is set so as to be shorter when a difference between an objective temperature and a hot-water temperature in a bathtub upon finishing the supply of hot-water into the bathtub by a hot-water supplying means is larger. CONSTITUTION:A difference between an objective temperature and a hot-water temperature in a bathtub 1 is operated by a control means 100 upon finishing the supply of hot-water into the bathtub 1. When the difference is larger, a set time until first additional heating is effected by operating an additional heating means D after finishing the supply of hot-water into the bathtub 1 is set shorter. Upon starting the additional heating operation thereafter, a set time until next additional heating operation is started is set so as to be shorter when a difference between the objective temperature and the hot-water temperature in the bathtub upon starting the additional heating operation is larger. The additional heating is started earlier when the deteriorating rate of the hot-water temperature in the bathtub is larger insuch a manner whereby the additional heating can be ensured. |
