| 摘要 |
<p>PURPOSE:To keep the temperature of a lower layer of a hot water storage thank at a lower one as well as improve heating means by providing a suction nozzle in the middle between the upper and lower portions of the hot water storage tank, and heating nozzle by the heating means and feeding it to the upper part of the heat water storage tank. CONSTITUTION:In the case where an intermediate layer 26 is located above a suction nozzle 20 and a temperature detector element 23, heating means 17 is on a rest state and only hot water supply from a pipe line 18 is performed, and in response to the hot water supply from the pipe line 13 through a pipe line 12 to a hot water storage tank 11. The intermediate layer 26 is lowered to detect an intermediate layer lower limit temperature predetermine of by the temperature detector element 23, e.g., 25 deg.C, whereby a solenoid on-off valve VA is closed with a solenoid on-off valve VB opened to drive a pump 15. Hereby, the water in the intermediate layer 26 is sucked in through the suction nozzle 20 and discharged, and thereafter heated by the heating means 17 after passing through pipe lines 21 and 16 and circulated to the upper part 11b of the hot water storage tank 11. Thus, dissolution operation of the intermediate layer 26 is assured.</p> |
