| 摘要 |
The present invention relates to a hot-water boiler, which is particularly aimed to improve thermal conduction efficiency and thus to save energy by increasing the heating speed of hot water and facilitating the flow of hot water at the same time. The present invention is characterized by inducing and discharging air to the upper side of a raw water tank, and heating raw water and returning water while the raw water and the returning water fill at least 95% of the inside of a penetration section and an adaptor section, thereby significantly improving the internal expansion force The heating pipes of the present invention are extrusion molded to have a hot-water pathway section in the inside thereof, wherein the hot-water pathway section can be of a semi-elliptical, rectangular, triangular, or circular shape, and is formed integrally with a sensible heat section having a flat plate shape, on both ends of the top surface thereof, and wherein an insulation section, which has an air layer at the outer circumference of the lower part of the hot-water pathway section, is formed such that the top ends are integral with the sensible heat section. |
