Abstract: An apparatus for recovering solar energy comprising a plurality of fluid warming up tubes 2a-2g which extend in parallel and side-by-side relationship in one plane. Each tube has two associated plane reflection surfaces which enclose a fixed angle .alpha.' in the order of 30.degree.-40.degree.. The reflection surfaces are arranged to be pivoted and moved transversely to said plane so that their bisector plane containing the centerline of the respective tube can be maintained directed to the sun without reflection surfaces associated with successive tubes overshadowing each other.