Saving heating costs by the use of heat recovery

airflow, which conducts from outside

Based on this observation, an equally simple and ingenious idea was born – the principle of heat recovery: We make use of energy contained in the warm, humid air, for example from the kitchen, bathroom, WC (“exhaust air�) to preheat the cold “outside air�. The latter is supplied to the habitable rooms, such as living rooms, bedrooms, nurseries and workrooms as “supply air�. Since the air flows within the heat exchanger of the ventilation unit always stay apart from one another, odours or contamination are by no means exchanged. Thanks to this procedure, heat supply rates of up to 95% (with condensate) are achieved. The recovered heat is more than 15 times as much as the electrical energy which is required for driving the fans.