NOVELTY - The casing has a polyurethane based thermoset polymer (12) molded during an assembly process in an open mold. A joint between a crystal (1) and components of a shell is realized by a thermoset polymer unit. The shell consists of aluminum sections and a metal or plastic sheet and sheet steel, and injection molded thermoplastic insert corners (11) from molded polymer or cast metal or sheet metal are bent or formed by pressure. The inserts in the thermoset polymer are connected with other systems. Geometric features integrated into the thermoset polymer have connection with other systems.    USE - Composite casing for a solar panel for heating water.    ADVANTAGE - The casing has low production cost, high quality and better functionality, and provides aesthetic appearance to the panel. The casing ensures strong and durable joint between the crystal and the panel shell, and strong and light panel casing. The casing ensures ability to use different materials such as plastic, aluminum and steel, for same configuration, and ensures total panel sealing and abolishing components. The casing makes simplification and shortening of the panel production and assembly procedure, and greater ability for automation. The casing provides more consistent quality and fewer defective products, greater freedom in designing the panel, and provides an ability to integrate inserts in the thermoset polymer for connecting the panel with other panels or support frames and to integrate design features in the thermoset for connecting the panel with other panels or support frames and to integrate embossed information on the panel. The casing makes simplification of the appearance of the panel, and makes ability to change the color of the polymer part of the panel without a need for painting.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for production of a solar panel for heating water with composite casing.    DESCRIPTION OF DRAWING(S) - The drawing shows a partial sectional view of a solar panel with composite casing comprising a thermoset polymer, folded sheet metal and thermoplastic corner inserts.    Crystal (1)    Aluminum or steel (10)    Injection molded thermoplastic insert corners (11)    Polyurethane based thermoset polymer (12)    Adhesive tape (13)