Warm mist humidifier
The warm mist humidifier (also called hot steam humidifier) works with two electrodes plunged into water; its steam is gentle and very well diffused throughout the room. You do not need filters in these humidifiers, as the boiling process kills any mould and bacteria. Impurities will also stay at the bottom of the tank and sediments will be fixed on the resistances (therefore it is necessary to clean it regularly; this operation does not take more than 2 minutes). The warm mist humidifier brings real softness to the air, be careful however if you have young children, you need to put the humidifier out of their range.