| 摘要 |
PURPOSE: A structure of a heat exchanger for a gas boiler is provided to improve combustion efficiency by using a heating pipe having heating pins, and to reduce the discharge of NOx. CONSTITUTION: Heating pipes(6) has heating pins(5), and covers a firebox(3). An inner case(7) is installed at intervals from the heating pins, and forms the firebox. A middle case(9) is installed at intervals from the inner case, and is communicated with a flue(8). An outer case(11) has an air guide passage(10) installed at intervals from the middle case, and takes the place of an insulating material.
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