A bottom supported solar receiver tube/header assembly having a bottom clip for supporting the entire load of a plurality of tubes carrying a heat absorbing fluid. The tubes are allowed to expand vertically upwardly under thermal flux conditions created when the fluid absorbs heat from the solar receiver panel. A receiver panel assembly incorporating a plurality of the bottom supported receiver tubes requires less piping than a comparably sized, conventional receiver panel assembly with top supported tubes and even better facilitates access and maintenance of valves associated with the receiver panel assembly. The invention further allows a solar receiver panel assembly to be constructed with significantly fewer drain and vent valves than previously developed, top supported receiver panel assemblies.