The WAVE is an air/air heat pump without an outdoor unit. Both technologies of both indoor and outdoor unit are united in one housing, which offers possibilities in places where the installation of an outdoor unit is not possible. The unit can be used for both cooling and heating and guarantees heating down to -10°C. It is standard equipped with a built-in controller. A built-in electric backup heater (PTC) can be activated in heating mode and only at the coldest times of the year.