DualSun combines photovoltaic and solar thermal technology info one hybrid solar panel. The cooling effect of the solar thermal water increases efficiency of PV electricity generation, and the otherwise wasted heat from PV panel electricity generation can be utilized for domestic hot water preheating, pool heating, or as a source for heat pump water heating. Made in France, DualSun panels offer a 25-year performance warranty for photovoltaic efficiency, and a 10-year parts warranty on hybrid panels. PV-only panels are available which match the look of the hybrid panels in case a higher ratio of photovoltaic panels is required. All DualSun panels are Solar Keymark and IEC certified.