| 摘要 |
PURPOSE:To hold high efficiency of the subject apparatus even when the outer air is dry by causing condensed water from a heat exchanger for condensation to flow down in a combustion air supply passage. CONSTITUTION:A combustion air supply passage 5 to a burner 4 is provided at the lower part of a primary heat exchanger 1, and an outlet of a condensed water receiver 3 from the heat exchanger for condensation is arranged in the vicinity of the inlet of the combustion air passage 5. Reference numeral 7 designates a combustion fan; and 6, a condensed water outlet provided at the lower part of the air supply passage 5. By this construction, the water content within the combustion air increases, and the quantity of recovered latent heat increases. |
