Both air and water cooled PV/T collectors have enjoyed growing attentions in recent years. Investigators have reported PV/T research data within a wide range of control parameters. In this paper, the effects of the major control parameters on the thermal/electrical performance of PV/T collectors are compiled and reviewed. Figures and tables are provided to give an overall picture about how PV/T performance could be improved in terms of these parameters. Although investigators understand the effects of different parameters, the improvement of WIT performance by optimizing these parameters has not been fully realized. (C) 2013 Elsevier Ltd. All rights reserved.