Patent ID: 8117998
Filing Date: 2012-02-21
Classification: F24D

Abstract:
1. A hot water supplying system that heats low-temperature water flowing into an inlet to a high temperature and supplies hot water through an outlet, the hot water supplying system comprising: a water tank for storing water flowed into the inlet; a heat exchanger for heating the water flowed therein; a controller that compares a temperature measured by a temperature sensor with a set preheating temperature and controls the operation of the heat exchanger, the temperature sensor being disposed at a predetermined position in a pipeline through which water flows; and a pump that is disposed in a pipeline connecting a first node with a second node, the first node being disposed on a pipeline connecting the heat exchanger with the outlet, and the second node being disposed on a pipeline connecting the inlet with the water tank, wherein a closed path is formed connecting the first node, the water tank and the second node so as to preheat the water in the water tank and in the pipelines only when the hot water is not supplied through the outlet, and wherein the pump is controlled to generate a pressure to circulate the water along the closed path only when the hot water is not supplied through the outlet.