| 摘要 |
<p>PURPOSE:To reduce the constituent subsystems and components, reduce the systems installation space, and facilitate the installation work by providing a trace hot water feed pipe and a return pipe to supply and recover the stored hot water as trace hot water, one of said pipes being connected to the reservoir tank and the other being branched from either a low temperature water outlet pipe or a high temperature water inlet pipe. CONSTITUTION:In order to heat and keep warm an outer hot water feed pipe 15 and an outer feed water pipe 13 that are connected to the hot water reservoir tank 3, a trace hot water return pipe 20 that is connected to the hot water reservoir tank 3 and a trace hot water feed pipe 21 that is branched from a high temperature water inlet pipe 6 at 6' are provided for supplying and recovering the stored hot water heater by a heat exchanger 2 for hot water supply as the trace hot water. By such a constitution in which the small diameter trace hot water feed pipe and return pipe are added, and the external piping for tracing having the outer hot water feed pipe or outer feed water pipe as integral part is connected, the function of the instant hot water supply and the prevention of freezing of the external piping can be realized. Since the externally installed subsystems and components can be reduced, the systems installation space can also be reduced, and the installation work can be facilitated.</p> |
