Heat exchange device and water heater

[0039] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

[0040] Existing gas water heaters mostly use stainless steel as the heat-conducting material. Stainless steel has poor thermal conductivity. The heat exchange effect is satisfied by increasing the external dimensions, but the increased external dimensions affect the miniaturization design trend of the product. Therefore, the gas water heate