Apparatus and installations for lighting, heating, cooling, steam generating, cooking, drying, ventilating, water supply and sanitary purposes; evacuated heat pipe solar collectors [heat exchangers]; outdoor solar lights; parabolic mirrors being parts of solar thermal collectors [heating]; solar cell lighting apparatus; solar collectors for heating; solar cookers; solar energy collectors for heating; solar energy powered heating apparatus; solar energy powered heating installations; solar furnaces; solar heat collection panels; solar heating apparatus; solar heating installations; solar heating panels; solar lamp units; solar lamps; solar lights; solar panels for use in heating; solar powered grills for cooking; solar powered heating apparatus; solar powered heating installations; solar powered lamps; solar powered torches; solar powered ventilation apparatus; solar thermal collectors; solar thermal collectors [heating]; solar thermal installations [heating]; solar thermal modules; solar thermal receivers [heating]; solar water heaters; solar-powered grills for cooking; solar-powered heating and industrial boilers; solar-powered heating apparatus; solar-powered heating installations; solar-powered lamps; solar-powered lighting bollards; solar-powered shed lights; solar-powered steam generators; solar-powered torches; solar-powered ventilation apparatus; steam generating installations using solar energy; supports adapted for use with solar heating tubes; thermal storage apparatus [solar energy] for heating; thermal storage instruments [solar energy] for heating.