Ariston Nimbus M Hybrid Universal Net R32 air-water heat pump 3.5 kW Single-phase inverter A++ WiFiAriston Nimbus M Hybrid Universal Net R32 air water heat pump 3. 5 kW Single phase inverter A++ WiFi Ideal for units of approximately 35 m2 with an average height of 2. 7 m The Nimbus M Hybrid Universal Net R32 heat pump contains the efficiency and reliability of the Ariston brand, also adding the predisposition for the creation of a universal hybrid system. This heat pump in fact, it can be combined with any boiler as it is equipped as standard with