You can measure the relative humidity in a room using a hygrometer. For measurement to be accurate, it is important for the hygrometer to be positioned correctly: set up the hygrometer on a raised surface in the middle of the room, away from windows and doors. Wait a few minutes for the sensor to adjust to the room temperature.

It is important to know how big the room in which you are going to be using the humidifier is. If the doors to other rooms are open, the area of those rooms must also be included. Room area is calculated by multiplying the length and width of the room (e.g. 5 x 6 meters = 30 m2). To get the room volume, you multiply the room area by the ceiling height (30 m2 x 2.5 meters = 75 m3). 

The room size should be doubled for minimum energy houses with controlled ventilation. 

Choose a humidifier that is recommended for at least your desired room size/area.

Water hardness is a measure of the quantity of minerals in water. The higher the percentage of those minerals, the harder the water. The device you need will depend on the hardness of your water. If you don’t know the hardness of your tab water, you can ask your local water supplier or ask us to send you a test strip Contact.

There are 4 different types of humidifier systems: evaporator, ultrasonic nebuliser, vaporiser and air washer. The water hardness is decisive for the choice of the appropriate system. 

• Soft water (0 ° - 4 °dH) = all systems
• Water of medium hardness (5 ° - 13 °dH) = all humidification technologies can be recommended though in the case of ultrasonic nebulisers, the anticalc cartridge should be used
• Hard water (from 14 °dH) = evaporators and air washers with an anticalc cartridge are recommended