| 摘要 |
PURPOSE:To increase the thermal efficiency of the title device and improve the workability thereof by connecting the heat exchanger which has fins at internal and external parts and in which heat exchanger components each consisting of an extruded shape or the like are opposed to each other, between a combustion part and an exhaust header. CONSTITUTION:Heat exchangers 17 integrally forming external fins 18 and internal fins 19 extrusion molding or pultrusion molding, are opposed so that the internal fins 19 are interposed at substantially middle positions, and end parts 21 are welded and a heat exchanger 16 in which a gas passage 20 is formed between the internal fins 19 is connected between a combustion part 10 having a burner 13 and an exhaust part 22 having a pressure equalizing plate 23. The exhaust part 22 is connected to an exhaust cylinder 25. |
