PURPOSE:To increase the pouring amount of hot-water without enlarging the capacity of a tap-controlled water heater by re-heating the hot-water, obtained by the tap-controlled water heater, by a heat transfer tube and pouring it into a bathtub. CONSTITUTION:When an automatic operation switch is put ON under a condition that a hot-water delivery cock 11 is closed, water is conducted from a water supplying circuit 35 and an electric controller 39 is operated to open a solenoid valve 32 of gas for the tap- controlled water heater and ignite a burner 25. Heated hot-water is sent into a rise-up pipe 23, an output water boiler section 21 and the heat transfer tube 20 sequentially. In this case, an ignitor is operated to ignite the burner 26 for the bath boiler and the hot-water is re-heated by the heat transfer tube 20, thereafter, is poured into the bathtub through a circulation inlet pipe 15. On this time, a signal is sent to the proportional control valve 33 of the tap- controlled water heater 2 by a temperature sensor 30 through the electric controller 29 so that a hot-water temperature becomes a desired temperature and, thus, the pouring hot-water temperature is controlled. When the amount of hot-water in the bathtub has arrived at a desired amount, a water level sensor 29 is operated, the conduction of water through the water supplying circuit 35 is stopped and the burner 25 for the tap-controlled water heater as well as the burner 26 for the bath boiler are extinguished.
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