The heat pumps series WPL feels right at home, inside and out. Their robust casing and the special hood for external installation enables the WPL to perform equally well in the garden or the yard. The quiet heat pump operation excludes almost any noise pollution, making it possible to install it, for example, in the cellar. The Air |Water heat pump delivers heating power from a compact design. Even at temperatures as low as -20 °C, the WPL can still yield sufficient thermal energy from the outside air. An electric booster heater makes sure that there is enough heating if required. The lower the required flow temperature, the higher the heat pump efficiency. Accordingly, the system is particularly recommended for low temperature or underfloor heating systems.