Abstract: A generally rectangular solar heat collector block or module adapted to operate with its narrow side in a generally vertical position. One face of the collector block is adapted to receive direct sun rays. The ray receiving face having a reflector surface commencing at a position closely adjacent the front and top of the block and terminating adjacent the rear and bottom of the block. A duct is disposed transversely in the bottom of the block and has a depth substantially coextensive with the depth of the block. Insulation is provided in the block rearwardly of the reflector surface. The reflector surface comprises a plurality of adjoining, different angled reflective surfaces which are arranged and constructed to dispense reflected sun heat rays substantially uniformly over an extended portion of the full depth of the duct. The module just defined is adapted to be used in multiples and arranged side-by-side and in vertical banks to form a wall panel for collecting solar heat.