Based on the concept of integrating heat pipes and a PV/T flat-plate collector into a single unit, a heat-pipe PV/T (HP-PV/T) collector was designed and constructed in a previous work [27]. The HP-PV/T collector can be used in cold regions without freezing, and corrosion can be reduced as well. The transient performance of the HP-PV/T sys-tem in Dongguan, China, was also studied both experimentally and numerically in a previous work. The current study presents a detailed simulation model for the system. Unlike PV/T system models pre-sented in the previous studies [13–16,27], the proposed simulation model can be used to predict the annual performance of the HP-PV/T system at different geometrical locations, and the additional ther-mal energy requirement for hot water is also considered. Using the simulation model, the annual electrical and thermal behavior of two HP-PV/T systems, with and without auxiliary heating equipment, are predicted and analyzed when used in three typical climate areas