Patent ID: 6627858
Filing Date: 2003-09-30
Classification: F24D

Abstract:
A hot-water supply system comprising:a tank having a water inlet side to which water from a water supply source is supplied, and a hot-water storing side for storing heated hot water for a supply; a water-heating unit for heating water introduced from the water inlet side of the tank, and for sending heated hot water to the hot-water storing side of the tank, the water-heating unit being disposed to be electrically operated; and a control unit for controlling operation of the water-heating unit, wherein, the control unit includes use heat-quantity calculating means for calculating a heat quantity used in a predetermined time period based on a hot-water supply amount from the tank in the predetermined time period, and for learning the heat quantity used in the predetermined time period, target heat-quantity calculating means for calculating a target heat quantity for boiling, based on the learned heat quantity in the use heat-quantity calculating means, target temperature calculating means for calculating a target boiling temperature of water, based on the target heat quantity calculated by the target heat-quantity calculating means, and boiling means for performing boiling operation of the water-heating unit by a necessary boiling amount, based on the target boiling temperature calculated from the target temperature calculating means.