Question about De'Longhi Pinguino 100 Silent

I would check the water tank and empty it more often if necessary.

if there is a lot of humidity in the air it's normal, as in these heatwave periods, it's like when you take a bottle out of the fridge and bring it to room temperature and you see condensation forming, this is what happens inside the air conditioner see "tito's" comment, check the water recovery tray, empty it if necessary as user "digitec-error" reported

This is normal because the warm room air condenses on the refrigerant evaporator (= cooling section) and drips off. In a car, the condensing water on the evaporator drips onto the road; in a monobloc device, it drips onto the refrigerant condenser (= heating section), where it is vaporised again and discharged to the outside with the warm air via the hose. The water noise indicates that the air conditioning unit is working normally.