In the event that the sun cannot provide enough energy to heat the water for a long period of time, the boiler can be automatically reheated using the optional 230V reheating device. To activate after-heating, a minimum temperature can be set on the boiler. This could be 35°C, for example. As soon as the temperature of the water falls below the set minimum temperature, the water is reheated using electricity from the network. During the post-heating phase, existing photovoltaic energy is also converted into heat. The reheating process ends automatically as soon as the water has reached the set minimum temperature again. fothermo recommends the 240W power pack for the 80 liter boiler to keep the post-heating time as short as possible. (The post-heater is not included.)
The maximum water temperature of the boiler is 65°C. When the boiler is completely heated, around 180 liters of 34-degree water can be drawn from it. As a rule of thumb, around 80 liters of hot water are available every day. Either only by the power of the sun or with the support of the optional 230V after-heating device.