Complex water heater and its re-tapping hot water temperature stabilization method

摘要

PURPOSE: To supply hot water at a stable temperature with a less temperature fluctuation when hot water is re-supplied by suppressing the cooling of hot water in a hot water supplying heat-exchanger by the wind of a combustion fan, when an additional heating burner performs a combustion during a hot water supplying burner stops its combustion. ;CONSTITUTION: The periphery of an exhaust air cylinder 20 on the additional heating functional side is surrounded by an air supplying pipe 22, and when an additional heating burner 12 burns, and a combustion fan 3 rotates, air is introduced to a suction port of the combustion fan 3 from the air supplying pipe 22 through an air passage 23. At this time, the temperature of the air is increased by absorbing the heat of the exhaust air cylinder 20, and additional heating heat-exchanger 11 and the burner case of the additional heating burner 12. This air with a high temperature is fed to a hot water supplying heat-exchanger 2 from the combustion fan 3, and the hot water supplying heat-exchanger 2 is back-up-heated, and the radiated portion of heat of the hot water supplying heat-exchanger 2 while a hot water supplying burner 1 stops its combustion is compensated. By this method, the cooling of hot water in the hot water supplying heat-exchanger 2 is suppressed, and hot water with a stable temperature can be re-supplied.;COPYRIGHT: (C)1994,JPO&Japio