| 摘要 |
PURPOSE:To enable to always supply hot water, by employing an arrangement capable of heating water in a hot-water storing tank by means of an auxiliary heating source in case that solar heat is not available. CONSTITUTION:Water heated mainly by a solar heat collector 2 is forcedly circulated to a heating section 3a in a hot-water storing tank 1 by a pump P in response to the temperature difference detected by a thermostat 4, so that water in the tank 1 is heated by the hot water supplied from the solar heat collector 2. Here, if the temperature of hot water in the tank 1 is not sufficiently high, an auxiliary heating source 6 and a valve 4'' are set into operation automatically for circulating heating water to a second heating-water circulatig circuit 5 to further heat water in the tank 1 by a heating section 5. Therefore, the temperature of hot water in the tank 1 can be always constant. With such an arrangement, it is enabled to feed hot water and perform space-heating in a reliable manner even under the state that solar heat is not absorbed sufficiently, in particular, in cold seasons or in cold districts. |
