Vacuum tube collector
With this especially high-performing collector type, the absorber consists not just of an area, but rather it is put in glass tubes. To prevent heat losses, there is a vacuum in the tubes (thermoscan principle).
Due to the tight construction of buildings, a natural air exchange is no longer an option. Systems for controlled residential ventilation take on this task and can transmit the energy from the air used to the fresh air. This saves energy.