Heat exchanger with header having improved fluid distribution

A metal panel for use in a solar energy collector system having a desired system of internal tubular passageways for a heat exchange medium disposed between spaced apart portions of the thickness of said panel and defining opposed headers connected by a plurality of spaced, parallel individual connecting portions of said passageways extending therebetween, with at least one first bonded portion of said metal defining said connecting portions, said passageways having entry and exit portions extending from said headers to opposed edges of said panel to provide ingress and egress openings for said heat exchange medium, wherein said headers each include a fluid distributing pattern comprising at least one second bonded portion, of said metal in said headers spaced from said first bonded portion, each of said second bonded portions defining at least one wedge-shaped projection adjacent and in juxtaposition to said entry and exit portions, respectively, said projections provided to assist in the distribution of flow of said heat exchange medium and to subdivide said flow into discrete channels.