Abstract: The present invention relates to a method for manufacturing a heat exchanger, comprising steps of manufacturing plates for an upper side and an underside of the heat exchanger, arranging a profile comprising edges and ribs in at least one of the plates, which profile, after assembly of the heat exchanger, defines a space on the inside of the heat exchanger, which space has a zigzag form for allowing a fluid to flow therethrough, fixing the plates to each other along the ribs and edges.

Abstract: A solar collector has a first plate for collecting solar energy, a second plate wherein there is an intermediate space between the two plates, and a quantity of liquid which is present between the plates for absorbing the energy collected by the first plate. The solar collector has a framework for fixing the plates at a mutual distance along the edges thereof so as to seal the space between the plates and to create space between the plates which comprises the liquid.