| 摘要 |
<p>According to a first aspect of the invention, the innermost edges of tubes (1') of a condensing gas boiler are substantially devoid of fins (8c) to define a drainage path for condensate formed on the fins. By this means the risk of condensate deposits formed on the fins or the tubes falling on to the burner and thus causing a malfunction is reduced. According to a second aspect of the invention, a tube of the heat exchanger is provided with detent means (53) for an edge of the heat exchange fins to facilitate accurate location of the fins. The applicants prior European application nos 0685698 and 0825406 form an integral part of the application. <IMAGE></p> |
