In this study, the thermal and flow analysis of a photovoltaic solar thermal collector (PV/T) cooled by forced water circulation was carried out by CFD (Computational Fluid Dynamics) analysis. A TINOX-coated aluminium absorber plate was used to enhance the thermal efficiency of the PV/T collector. The water circulating through the collector was drawn in via a water inlet with a diameter of 18 mm. CFD analysis of the solar PV/T collector was performed to examine the impact of water flow on the heat transfer. Optimum operating ranges of the system were determined and compared under different radiation and mass flow rates. CFD analysis of the PV/T collector with TINOX-coated aluminium absorber was performed under 600 W/m2, 800 W/m2 and 1000 W/m2 radiation at 0.01–0.03 kg/s mass flow rates. A constant water inlet temperature about 15°C was considered and corresponding outlet temperatures of the circulating water were obtained.