stacking effects within the reservoir 42 the solar storage reservoir effluent conduit 20 connects the solar storage reservoir 42 wih the solar collector 14 to enable the transfer medium 16 in the solar storage reservoir 42 to be transferred by thermostat controlled pump 24 to the solar collector 14 the opening to solar storage effluent conduit 20 within the solar collector reservoir 42 is positioned to remove the solar transfer medium 16 from the lowermost portion of the solar collector storage reservoir 42 where the medium is maintained at the coldest possible temperature similarly the return conduit 28 is positioned to reintroduce the solar heated transfer medium 16 back into the solar storage reservoir 42 at a point below the baffle 52 more particularly the return conduit 28 enters the reservoir 42 extends a short distance radially inward and then forms a perpendicular l shaped bend so that the opening is tangentially disposed to the wall of reservoir 42 by such arrangement a rotational spin about the circumference of the solar reservoir 42 is imparted by the re entering heated fluid to the fluid already in the lower chamber 56 this rotation helps restrict the physical mixing to the lower chamber by imparting a directional rotational flow within the reservoir 42 and eddying currents from such flow are restricted to the lower chamber 56 by the depending flange 61 as discussed earlier similarly the effluent conduit 20 enters the reservoir 42 and extends a short distance radially inward in contrast to the return conduit 28 the effluent conduit 20 bends perpendicularly in an opposite direction so that the effluent conduit opening is facing the oncoming rotational flow of the collector fluid by this arrangement the effluent conduit opening scoops up the coldest solar transfer fluid traveling toward the.