NectarSun uses MPPT (maximum power point tracking) system, that searches for the maximum power point. That is the most efficient way to use the photovoltaic elements. Photovoltaic elements connected to NectarSun can heat up 200 liters capacity boiler in 4-5 hours on a sunny day. While using just photovoltaic elements that is connected directly to the heater may (or may not) heat up the water in a day. Also with the NectarSun connected to the     Wi-Fi you can control grid/no grid/sun settings, water temperature, see the statistics.