PURPOSE: To enable an amount of hot water in a bath tub to be easily varied by a method wherein a timer tor setting a hot water feeding time starting from on operation starting time of a water level sensor to a termination of hot water feeding time and a water level setting unit for adjusting a length of hot water feeding time are provided.

CONSTITUTION: Under a condition in which either hot water or cold water is not stored in a both tub 7, it a hot water feeding switch 60 of a controller 6 is pushed, a hot water feeding passage composed of pipings (a), (b) and (c) is formed by changing- over a three-way valve 4. A pump 5 is started to operate and a solenoid valve 2 is opened. Hot water discharged from a hot water feeding source 1 passes through a dripper 3 and the three-way valve 4 and then is fed to a bath tub 7. When a water pressure applied to the water level sensor 8 is higher than a desired value, the water level sensor 8 is turned on a hot water feeding is continued for a desired period of time of a timer stored in the controller 6. After the water level in the bath tub 7 reaches a desired water level H, the solenoid valve 2 is closed and the pump 5 is stopped to complete a hot water feeding. A length of setting time in the timer can be adjusted by a setting dial 61 of a water level setting unit and so the setting time can easily be varied.