One of the main users of energy in Belgium are buildings. Traditional heating systems for buildings are based on fossil fuels and thus also expel significant amounts of CO2. One of the widely supported alternatives for the traditional boilers is the heat pump. In combination with PV panels, a large part of the electricity use of the heat pump can be made renewable. A proposed combination of both techniques are the so called PVT heat pump panels. The outdoor unit of the heat pump is combined with the PV panels. This eliminates the need for a separate outdoor unit with fan while increasing the heat transfer surface. Furthermore, the PV panels operate at a lower temperature which increases the efficiency.