A polyurethane PU solar heat collector was combined with polycrystalline silicon PV cells in a hybrid energy-generating unit that simultaneously produced low temperature heat and electricity. The solar radiation increases the temperature of PV modules, resulting in a drop of their electrical efficiency. By proper circulation of a fluid with low inlet temperature, heat is extracted from the PV modules keeping the electrical efficiency at satisfactory values. The extracted thermal energy can be used in several ways, increasing the total energy output of the system. Hybrid PV/T systems can be applied mainly in buildings for the production of electricity and heat and are suitable for PV applications under high values of solar radiation and ambient temperature. Because PV/T panels have higher energy output per unit surface area than a combination of separate PV panels and solar thermal collectors, they are especially useful where roof space is limited, like most of residential areas. In addition, the installation cost of a PV/T system is potentially much lower than the installation cost of separate PV and thermal systems.