| 摘要 |
PROBLEM TO BE SOLVED: To realize a heat of high heat efficiency by fully recovering the heat of combustion gas, in a heater whose first combustion gas passage for circulating combustion gas discharged from the first burner part is equipped with the first heat conductive pipe for circulating inside the first liquid circulating being radiated, circulating in an outside circulation passage. SOLUTION: This heat is equipped with a second heat conductive pipe 40a, which recovers the latent heat in condensation of the combustion gas circulating in a first combustion gas passage 5, letting the second liquid separate from the first liquid circulate inside below the dew point of combustion gas. |
