| 摘要 |
PROBLEM TO BE SOLVED: To improve an accuracy in the filling of hot-water by a method wherein the extraction of air in a returning pipeline, provided with a pressure sensor, is ensured to make the detection of water level in a bathtub through the pressure sensor correct. SOLUTION: A hot-water supplying passage 37 is connected to a returning pipeline 41 by a flow passage switching means 38 upon filling a bathtub 11 by hot-water to supply the hot-water through one pipe of the returning pipeline 41. Hot-water is supplied into only one pipe of the returning pipeline 41 whereby the pressure and the flow rate of hot-water, flowing in the returning pipeline 41, are increased to ensure the extraction of air in the returning pipeline 41 provided with a pressure sensor 47 whereby the accuracy of filling of hot-water can be improved. |
