The heat pump works with a speed controlled compressor and delivers heat and DHW up to 70°C. It can also be used for energy saving surface cooling. The compact wall mounted indoor unit houses the controller and user interface, as well as all the essential hydraulic components for operating the heating system. It is controlled with the leading-edge Ochsner Tronic Smart (OTS) and can be operated either on the 7" touchscreen of the heat pump indoor unit or using the OCHSNER Smart app.