AUTOMATIC HOT-WATER SUPPLIER

PURPOSE:To reduce the volume of a hot-water reserving tank as well as the space for installation of the same by a method wherein hot-water is supplied automatically through a mixing cock whenever the temperature of the hot-water reserved in the tank is risen to a requested temperature. CONSTITUTION:When the lower tank sensor 5 of a tank 1 has detected the temperature of 65 deg.C, for example, the operation of a heat pump 2 is stopped and an automatic opening and closing valve 11 is opened, whereby the hot-water in the tank 1 is mixed with water from a city water pipe 6 and is supplied into a bathtub 17 through a hot-water supply port 14. At the same time, cold water from the city water pipe 6 flows into the tank 1 and when the hot-water temperature in the tank 1 becomes lower than 65 deg.C, an upper sensor 9 detects the temperature, the automatic opening and closing valve 11 is closed and the hot-water supply of first time is finished. Here, the heat pump 2 starts the operation thereof again from the time when the temperature has been reduced lower than 65 deg.C. Thereafter, above-described motions are repeated until a water level sensor 15 detects the signal of ON. Thus, the capacity of the tank 1 is enough to suffice a volume consumed in washstand, shower, toilet, kichen or the like and it may be miniaturized.