The water reservoir with a coil mounted in it is in fact a flow-through heat exchanger. The borehole is connected to the water supply network. The water passing through it is heated by the water in the water tank and the shower-battery is with the pressure of the grid. After the initial filling of the water container, the water in it decreases only by evaporation.
The auxiliary vessel is an option and a periodic refill can be used instead. The coil fittings are located on the side as well as the auxiliary electric heater. Can be used all year round. If there is an electric boiler in the household, it is advisable to connect in one system so that in the winter months the water from the solar collector goes into an electric boiler.
The advantages of this type of solar systems are to eliminate the need for displacement and can be installed in any convenient location.