A heat exchange unit having a plurality of chamber assembly coupled to a plate member, said chamber assembly including an inlet flow tube, an outlet flow tube, and a plurality of walls defining a chamber interior. Disposed within the chamber interior is a medium-directing member, having an inclined surface, diverting the heat exchange medium from the initial flow direction so that it disperses within the chamber interior, in to at least two distinct flow patterns. The heat exchange medium exits the chamber, via the outlet, in the initial line of flow. The chambers are interconnected by tubes to form assemblies. A plurality of plate member having plurality of chamber assembly is arranged on a spaced relation between manifolds to complete the medium flow.