The tubra®-e-Therm is a hydraulic unit with integrated control for thermal storage of photovoltaic power to optimise in-house consumption. The compact hydraulic unit can be connected as a module to hot water accumulators with drinking water and buffer accumulators with heating water. Retrofitting to existing drinking water and buffer accumulators is easy. The integrated power measuring device is installed at the grid feed-in point upstream of the power meter. This helps to ensure priority for domestic electricity system-side. The control manages the output of the electric heater to reflect the excess power generated by the photovoltaic system in order to avoid grid feed-in. Output modulation makes it possible to use the entire excess photovoltaic energy production thermally despite fluctuating energy production and fluctuating domestic electricity consumption.

The fast reaction time for output measurement and output modulation ensures that no grid current is used for heating purposes. Even low and fluctuating excess power can be converted to usable heat with a constant temperature. The accumulator is charged in layers top-down; usable heat is available after a short time, and conventional, fossil re-heating is suppressed. The tubra®-e-Therm can output useful charge temperatures even at low outputs thanks to dual modulation.

The electrothermal station

• Can be used on buffer tanks and heating registers of drinking water storage tanks.
• Perfect for retrofitting of existing accumulators.
• A compact hydraulic unit with integrated output measurement, power control and accumulator charge management, independent of the inverter and power meter system.
• Energy storage in hot water accumulators with far greater storage capacities than in batteries.
• Fast output modulation up to 3000 W in combination with speed control of the charge pump for a constant target termperature up to 80°C and thus immediately usable heat.