High efficiency in the photovoltaic (PV) panel is a relevant matter when considering the high investments for this energy source. This paper presents a PV panel efficiency improvement by heating water and heat storage as surface geothermal energy. The whole set consists of a PV panel, a heat exchanger located on the PV backside, underground hoses for heat exchange, water pump, DC-DC converter, a controller to obtain the maximum PV power point (MPP) and data logger to store data of voltage, current, radiation and temperature. This PV assembly, also known as PV thermal (PVT), is used in conjunction with surface geothermal energy to increase electrical and thermal power efficiency.