The WANAS Mini water cooler is a large capacity device designed for cooling (or reheating) of the supply air to the rooms. It is mounted on the supply duct after the recuperator and controlled by means of any WANAS recuperator. It is an ideal connection to a heat pump, where we use the cooler is bottom cooling circuit. In this way, we have the cheapest way of subduing the rooms, and at the same time regenerating the lower source.