| 摘要 |
The present invention provides an outdoor water heater (10) having a lower chamber (12) located in a cabinet (14) which substantially sealingly encloses a naturally aspirated or natural draught burner 16, a combustion chamber, a heat exchanger (18), a flue (20) for conveying combustion gases from the burner (16), the flue (20) extending away from the heat exchanger (18) and passing through a middle chamber (22) located above the lower chamber (12), the flue (20) not opening into the middle chamber (22) and opening into an upper chamber (24) which has two opposed openings (24.2, 24.3), the upper chamber (24) and middle chamber (22) being substantially sealed with respect to each other to prevent combustion gas flow between the middle chamber (22) and the upper chamber (24), and wherein the middle chamber (22) has divider formations (22.1, 22.2) separating one side of the middle chamber (22) from an opposed side of the middle chamber (22), whereby the divider formations (22.1, 22.2) direct air flowing from one side of the middle chamber (22) to pass downwardly into the lower chamber (12) on one side then upwardly out of the lower chamber (12) to exit the middle chamber (22) on the other or opposite side. |
