Abstract: A solar collector device generally comprises two laterally spaced apart frame arms with sockets located therein for the reception and support of solar collector pipes transversely extending therebetween. Within each frame arm, selected pairs of sockets are placed in fluid communication by means of intersecting ducts, each duct respectively emanating from a socket of each socket pair. This socket/duct network achieves a serial back-and-forth flow, relative to the frame arms, of solar collector fluid throughout the collector pipes from the point of fluid intake to the point of fluid discharge. Located underneath the collector pipe array is a reflective surface having upwardly directed channels, each collector pipe lying within each channel along its transverse span. The channel sides are angularly positioned so as to provide maximum solar ray reflectance and attendant absorption by the collector fluid throughout its serial flow.