| 摘要 |
PURPOSE:To enhance the anti-corrosiveness of a boiler, by constructing a boiler applied with plating of molten metal and a hot-water circulating circuit using copper pipes in combination economically, and employing such an arrangement that hot water in the hot-water circulating circuit having copper pipes is not returned to the boiler. CONSTITUTION:When a tap 7 is closed, hot water discharged from a hot-water supply port 3 is introduced into a tank 10b via iron pipes 12, 13, and after heating water in a coil 10a, is returned to a hot-water return port 4 via an iron pipe 14, a circulating pump 11 and an iron pipe 15, thus constituting a water heating circuit. On the other hand, water heated in the coil 10a is passed through copper pipes 19, 17, a circulating pump 6 and a copper pipe 18 and then returned to the coil 10a, thus constituting a hot- water circulating circuit. When the tap 7 is opened, water is supplied from a water supply pipe 5 and hot water in the boiler 1 is supplied from the tap 7 via the iron pipe 12, copper pipes 16, 17 and the circulating pump 6. Thus, since hot water in the hot- water circulating circuit (10a-17-6-18-10a) having copper pipes is not brought into contact with the boiler 1 nor with the water heating circuit (12-13-10b-4-11-15), the water heating circuit and the boiler applied with plating of molten metal are protected against corrosion by copper ions. |
