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The present article provides an overview about photovoltaic/thermal systems categorised by the temperature of the working fluid: Low-temperature (lower than 60 o C), medium-temperature (between 60 and 90 o C) and high-temperature (higher than 90 o C). Concerning photovoltaic/thermal-air systems for low-temperature use, the majority of studies involve building-integrated non-concentrating systems with phase change materials and working-fluid temperatures at around 30-55 o C. Concerning lowtemperature photovoltaic/thermal-water systems, a large number of studies are about nonconcentrating configurations appropriate for building-integrated and, in general, domestic applications with working fluids at approximately 50-60 o C. Regarding non-concentrating photovoltaic/thermal systems for medium-temperature use, a large number of references are appropriate for industrial and domestic applications (working fluids: air; water) with around 60-70 o C working-fluid temperatures. The literature review about mediumtemperature concentrating photovoltaic/thermal systems shows that the majority of investigations concern photovoltaic/thermal-water systems with concentration ratios up to 190X and working fluids at approximately 62-90 o C, appropriate for domestic and water-desalination applications. As for high-temperature concentrating photovoltaic/thermal systems, most of them have concentration ratios up to 1000X, parabolic concentrators and use water (as the working fluid) at around 100-250 o C.