HOT-WATER SUPPLY SYSTEM

PROBLEM TO BE SOLVED: To provide a hot-water supply system capable of saving energy by reducing wasteful burner combustion. SOLUTION: An information incorporating means 31 incorporates at least one piece of hot water supply related information of a hot water supply set temperature, a hot water supply flow rate during present supply hot water usage, an input water temperature to a hot water supply heat exchanger during the present supply hot water usage, an interval from a prior supply hot water usage end to a present supply hot water usage start, and a prior supply hot water usage duration time. A standby time determining means 34 determines a present standby time in the preset supply hot water usage from hot water tap opening to ignition by referring to the incorporated hot water supply related information, and information of a standby time from opening of a hot water tap to ignition of a burner set in correspondence with at least one condition of a condition relevant to respective pieces of information of the hot water supply related information and a condition relevant to combined pieces of information of two or more. When hot water supply is continuously carried out before passage of the determined standby time, an ignition control means 36 carries out ignition of the hot water supply burner when the determined standby time passes. COPYRIGHT: (C)2007,JPO&INPIT