upside opening of the cubiform container is covered with a light permeable glass plate through a metal sealing collar having the same coefficient of thermal expansion as that of the light permeable glass plate thereby permitting a large quantity of electrical energy and thermal energy to be extracted simultaneously from a small space of installation and at less cost moreover the completely airtight construction of the combination of the cubiform container and the light permeable glass plate ensures that the solar cells contained therein are thoroughly protected application_number US 52160483 A description referring now to fig2 and 3 one preferred embodiment of present invention will be described a flange 4 39 is incorporated with the periphery of the upside opening of a cubiform container 4 prepared by processing a metal plate such as an iron plate into the form of a dish a heat collecting plate 6 which is an aluminum copper or iron plate is mounted on a heat insulating material 5 such as glass wool contained in the cubiform container 4 a heat collecting tube 7 made of copper or aluminum and used as a heating medium tube is arranged in a zigzag line in a thermal conductive manner and both its ends are projected from holes 8 made in.