Solar heating panel

A solar heating panel for converting the sun's rays into heat, comprising a single, flat pane of glass, a sheet metal panel behind said pane of glass in spaced relationship therewith to provide a space between said pane of glass and said metal panel, said sheet metal panel and said pane of glass having peripheral outer portions, a peripheral hermetical seal between said outer portion of said pane of glass and said outer portion of said sheet metal panel, a vacuum in said space, said sheet metal panel having a blackened surface facing said pane of glass, evenly spaced projections pushed out of the plane of said sheet metal panel having sharp points resting against said pane of glass to resist the atmospheric pressure acting on said pane of glass and said sheet metal panel, said blackened surface serving to convert solar rays into heat to heat up said sheet metal panel. A vacuum connection arranged to be in communication with said space containing said vacuum, and means to close off said vacuum connection.