| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hot-water storage type hot-water supply apparatus which can store and boil water other than tap water even during a water stoppage state. <P>SOLUTION: The hot-water supply apparatus has a circulation pump 10 which is provided in midstream of a supply pipe 8 and which circulates hot water, a return pipe 9 which returns from a heating heat exchanger 4 to an upper part of a hot-water storage tank 2, an auxiliary pipe 29 which is connected to the supply pipe 8 between the hot-water storage tank 2 and the circulation pump 10 through a switching valve 27, a return bypass pipe 31 which returns in midstream of the return pipe 9 and communicates a bottom portion of the hot-water storage tank 2 through a three-way valve 30, and a controlling unit 37 which has a boiling mode for controlling the circulation pump 10 and circulating the hot water in the hot-water storage tank 2 to the heating heat exchanger 4, wherein the controlling unit 37 has an emergency water storage mode for switching the switching valve 27 to the auxiliary pipe 29 side during water stoppage to make the return three-way valve 30 communicate with the return bypass pipe 31 for driving the circulation pump 10 and for storing water sucked through the auxiliary pipe 29 from the bottom portion of the hot-water storage tank 2 through the return bypass pipe 31. <P>COPYRIGHT: (C)2013,JPO&INPIT |
