The Calpak-VBus®Touch app makes solar yield visible. In addition to a hydraulic scheme and a temperature progression chart, the solar heat gained will also be displayed. To visualise an individual system with VBus®Touch, a controller equipped with a VBus® interface and connected to the Internet by means of a Datalogger or Communication module is required. The basic version of the VBus®Touch app is available free of charge at Google Play™ . Extended features will be available as modular add-ons which the user can individually combine.