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Air washer AW 20 S
Home Comfort
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  5. AW 20 S


3-in-1 comfort device for air humidification, air purification and odour elimination – with HEPA filter to protect against viruses, bacteria and allergens in the room air

Additional health protection through a multiple improvement in indoor air quality

Humidified and cleaned breathing air is pure life energy and an additional protective shield against airborne diseases! A single cubic centimetre of air contains up to 50,000 particles such as fine dust and pollen, but also bacteria or aerosol particles containing influenza and SARS-CoV-2 (COVID-19) viruses. And since we breathe around 8,000 litres of air every day – around 80 % of which indoors – the air washer AW 20 S provides increased protection against these airborne pathogens.

Protects against viruses, increases well-being and prevents allergy symptoms

The air washer AW 20 S optimises the air quality with an air flow rate of 228 m³/h, adjustable via 3 fan stages, in rooms up to 55 m² or 138 m³ in multiple ways. In contrast to conventional air cleaners, which additionally dry out the already dry heated air in the cold season, the AW 20 S simultaneously cleans and humidifies the air to achieve a hygienically perfect water quality. Particles contained in the sucked-in air are bound with a film of water and washed off by a rotating humidifier disk in the 9 litre water tank. The three-stage high-performance filter technology with two high-quality HEPA filters (97.97 % separation efficiency) additionally frees the air from tiny suspended particles, viruses, bacteria, pollen, mite faeces, mould spores and dust down to a particle size of 0.3 µm. The multi-stage air hygiene is rounded off by plasma ionisation for eliminating unpleasant tobacco, food or animal odours.

Breathing freely – without pollutants, viruses or allergens in the air

Combined air washing with double HEPA filtration removes almost all irritants from the room air which can cause allergic reactions such as swelling of the airways, burning eyes or a runny nose in allergy sufferers, children with sensitive airways and people living in households with animals. Air humidification, which is part of the air washing process, also reduces the risk of aerogenic virus transmission, strengthens the body's natural defences and increases well-being.

Different particle sizes in graphic comparison

Different particle sizes in graphic comparison

The image shown here illustrates different sizes of particles that are inhaled indoors every day. Thanks to an integration of two HEPA filters in the AW 20 S, airborne viruses, bacteria, fungi, mould spores, pollen, dust and other pollutants with a particle size of down to 0.3 µm are noticeably removed from the room air with a separation efficiency of 97.97 %.

Best indoor air quality for spending quality time together

With the air washer AW 20 S, you are ideally equipped to constantly maintain the pollution of the room air at a healthy feel-good level in order to protect your family, employees, customers or guests. Fully automatically, an intelligent combination sensor measures the most important room air parameters and controls the necessary air purification and humidification intensity in automatic mode. The integrated and easy-to-clean water tank, designed for continuous level measurement, has a capacity of 9 litres, which is sufficient for up to 24 hours of humidification operation. Additionally, the humidifier disks can be cleaned conveniently and easily in the dishwasher. Nine operating modes, a fan that can be adjusted in three stages, and other comfort functions allow you to improve the room air according to your individual requirements.

Everything that improves the air quality – for a healthier life

Just like individual well-being, the indoor air quality depends on various factors. For this reason the humidification function, the particularly effective HEPA air purification function and the odour elimination function of the air washer AW 20 S can be switched on and off as required. Just as the personal environment and season demand.

3-stage air purification and odour elimination

A multi-stage, combined air purification system removes viruses, bacteria, pollen, mite faeces, mould spores and dust as well as other suspended particles from the room air.

  • Purification stage 1: The pre-filter removes coarse particles from the room air.
  • Purification stage 2: The HEPA filter (97.97 % separation efficiency) and air washing process in the water bath separate particles sized down to 0.3 µm from the air.
  • Purification stage 3: The plasma ionizer eliminates airborne pollutants and unpleasant odours.

Humidification with optional HEPA air purification

The operating mode humidification with a capacity of 750 ml/h can be selected either with or without HEPA air purification. Moreover, the air purification function can also be used separately without humidification. The room air is humidified according to the natural principle of cold evaporation without filter mats. In contrast to ultrasonic or steam humidifiers, the evaporation process cannot cause white spots (limescale deposits) or wet spots in the room. What is more, it is impossible to over-humidify the air. The comfort display on the control panel shows the current room air humidity in the range from 20 to 60 %. When the comfort zone (50 % relative humidity) is reached, the device stops humidification automatically.

Convenient automatic mode

The best is just good enough when it comes to your health? Then let the sensor-controlled automatic mode take control of the air quality. An intelligent sensor continuously measures the air quality and humidity and adjusts them to the best possible range without your intervention. A 3-stage light signal provides information on the current air quality at all times.

Restful night mode

Restful sleep is guaranteed: in night mode, the AW 20 S operates ultra-silently, and reliably frees the room air of pollutants while maintaining an ideal humidity level based on the natural principle of self-regulating cold evaporation. This way your skin, nose and eyes are protected against drying out and you can benefit from a good night's sleep.

Tip: SecoSan stick for perfectly hygienical water quality

The optionally available SecoSan stick ensures a hygienically perfect water quality in the water tank for up to 6 months. An optical change indicator on the control panel informs you fully automatically as soon as the stick needs to be replaced. The SecoSan Stick 10 "made in Germany" prevents the reproduction of germs, algae, mould and bacteria in all water containers with a volume of up to 10 litres.

Clean breathing air is the fuel of a healthy body. The air washer AW 20 S ensures hygienically clean and uncontaminated room air in both private and professional environments.

Triple operating principle of air washing: cleaning, humidification, odour neutralisation

The combination of as many as three air purification processes and a multi-stage filtration through pre-filter and HEPA filters make the air washer AW 20 S the undisputed leader in its class.

First cleaning process: air washing inspired by nature

Already in the first cleaning cycle, the polluted room air is washed clean in a natural way – without any chemical additives. To do so, the device sucks in room air contaminated with particles and pollutants and passes it through a pre-filter to a rotating humidifier disk, where the contaminated air is wetted with a film of water. Contaminations such as pollen or dust stick to the wet disk and are washed off in the water bath by the cleaning power of natural tap water. A positive side effect of this natural air washing process is the automatic humidification of the room air. The interaction of air washing and air humidification noticeably improves the indoor climate and well-being.

Second cleaning process: double HEPA filtration

Thanks to an integration of two HEPA filters, airborne viruses, bacteria, fungi, mould spores, pollen, dust and other pollutants with a size of down to 0.3 µm are removed from the room air with a separation efficiency of 97.97 %.

Third cleaning process: plasma ionisation

With the plasma ionisation, which can be switched on as required, another cleaning cycle based on the principle of nature starts. Comparable to a "purifying thunderstorm", both positive ions (hydrogen) and negative ions (oxygen) are produced and blown into the room together with the air that has been cleaned by the HEPA filters and humidified. The bioactive bunching of ions directly in the room air, to form so-called cluster ions, causes water to be extracted from the pollutants in the ambient air upon contact. This way, pollutants and odours contained in the room air are eliminated.

Reduction of viruses and pollutants thanks to an optimum humidity level in the room air
The mucous membranes must be well moistened
The optimum humidity level kills viruses

Optimally humidified room air protects against viruses and pathogenic germs

Scientific studies prove the double protective effect of an optimally regulated indoor air quality in infection prevention. Pathogenic viruses such as the influenza or SARS-CoV-2 virus are released via so-called aerosols when we breathe or speak, and can remain suspended in the room for up to several hours if there is insufficient ventilation. Invisible, but still highly infectious.

At an ideal humidity level between 40 and 60 percent, airborne viruses are inactivated within seconds

The infectivity of virus-infected aerosols depends decisively on the prevailing humidity level. If the room air is too dry, aerosols shrink and float in the room air for a longer time due to their low weight – before being inhaled unnoticed. Optimally humidified air, on the other hand, changes the salt concentration of the aerosol particles so that the contained pathogen becomes harmless immediately after contact with the air.

Optimally moistened mucous membranes are the best and most natural infection protection against pathogenic germs in the air

The body is not defenceless against the dangers of viruses and bacteria. It has its own defence mechanisms to protect itself against pathogens in the air. The mucous membranes of the mouth, nose and throat of our airways are a central component of our body's own immune defence and, when optimally moistened, provide highly effective protection against pathogens in the air. Too dry room air, on the other hand, withdraws the necessary water from the mucus layer, so that the previously protective mucus layer becomes hard and infectious pathogens can penetrate the body almost unhindered.

Therefore, increasing the room air humidity to around 50 % minimises the risk of infection by airborne pathogens in multiple ways in the private and professional environment.

AW 20 S – special equipment features

AW 20 S – compact dimensions
The air washer with its living room friendly design convinces with compact dimensions and a comparatively small footprint. Clean air: nothing to sneeze at.
AW 20 S – control panel
With 9 different operating modes, the AW 20 S can be configured for every demand in an uncomplicated manner. An illuminated scale informs you about the current humidity values in the room at any time and a coloured display additionally indicates the current air quality level.
AW 20 S – HEPA filter
Two high-quality HEPA filters guarantee highly efficient separation of bacteria, viruses, allergens and other suspended particles from the room air. The filter can be changed without tools.
AW 20 S – cleaning
Cleaning of the air cleaner is just as simple and effective as the operation of the AW 20 S itself, and requires only a few steps. The device can be easily disassembled for cleaning purposes and cleaned quickly. This way, even a regular filter change is an easy job.
AW 20 S – maintenance-friendly
Not only the operation but also the care of the AW 20 S is particularly convenient. Since the device is designed in an extremely maintenance-friendly way, all components are easily accessible. Practical detail: A suitable cleaning brush for the humidifier disks is always readily available in the side compartment.
AW 20 S – start-up
Plug in, switch on – that's it: The air washer AW 20 S is set up and ready for operation in a matter of minutes. Ensure an optimum room climate quickly and easily.
AW 20 S – air inlets and outlets
The lateral air inlets and outlets guarantee optimum air circulation in the room. After cleaning, the sucked-in air is discharged vertically upwards into the room with a maximum air volume of 228 m³/h.
AW 20 S – SecoSan stick
Tip for perfect water hygiene: as the ideal accessory for your air washer, we recommend our SecoSan stick. Thanks to the natural silver ion principle, it prevents the formation of bacteria, viruses, fungi and biofilm in the 9 litre water tank. Special highlight: the AW 20 S display automatically informs you when the SecoSan stick needs to be replaced!

Fresh and clean air – easy and quick cleaning

AW 20 S – cleaning the humidifier disks
Cleaning the humidifier disks is just as easy as it is to change the filter. Just turn your hand once to release the disks from the holder.
AW 20 S – cleaning the humidifier disks
The humidifier disks are cleaned with clear water and without any additional chemicals. This allows you to clean the removed disks quickly and conveniently in the sink.
AW 20 S – convenient cleaning in the dishwasher
You like it especially comfortable? Then simply clean the dishwasher safe humidifier disks in the dishwasher.
AW 20 S – clean breathing air
Clean breathing air to protect your loved ones and their health! The air washer AW 20 S provides clean and uncontaminated room air. The best conditions for a carefree time with the family.
All fans in direct comparison

All air washers in direct comparison:

To find the air washer which exactly meets your requirements, please consult the concise overview of all air washers of the AW-S series from Trotec, which we're providing to you here so that you can compare them directly to each other.

Models which you do not wish to include in your comparison can be easily dismissed with only one click.

Technical data by comparison

A few practical benefits

  • 3-in-1 combination device: Humidifier, HEPA air cleaner and odour eliminator (plasma ionisation)
  • Keeps the room air ideally humidified and reliably removes viruses, bacteria, house dust, pollen, mould spores, mite residues, animal hair and odours
  • HEPA filter with a separation efficiency of 97.97 % can be switched on when needed
  • Can be used all year round for air cleaning thanks to a humidification function that can be switched on or off separately
  • Natural principle of cold evaporation without filter mats – no limescale and wet spots as with ultrasonic and steam humidifiers
  • Sensor-controlled automatic operation – an intelligent sensor measures the air quality and humidity level for automatic control
  • 3-stage colour signal on the display indicates the current room air quality
  • Indication of the relative humidity level on the control panel
  • 9 operating modes – humidification, purification and odour elimination can be combined or switched on individually
  • 3 fan stages – air flow rate of up to 228 m³/h
  • Evaporation performance of up to 750 ml/h
  • Large 9 litre water reservoir for long maintenance-free operations
  • Ultra-silent night mode
  • Water level indicator, warning signal and automatic switch-off when the water tank is empty
  • Can be used with tap water
  • Easy to clean, e.g. in the dishwasher
  • Display indicating when the optionally available SecoSan stick in the water tank needs to be replaced

Air purification and humidification – perfect for your home and in the office

Year-round feel-good climate for your home: The AW 20 S offers you 3 functions in one. Air washing and HEPA filtration remove viruses, bacteria, dust, lint, animal hair and mould spores from the indoor air. The integrated ionisation function reliably eliminates odours. In addition, the breathing air is pleasantly humidified according to the natural principle of cold evaporation.
AW 20 S at home
For clean air and an optimum humidity level at work. The AW 20 S air washer ensures an optimum room climate so that your respiratory tract is not irritated by pollen, toner dust, pathogens and excessively dry air at work. This allows you to concentrate on your work with a good feeling.
AW 20 S at the office

Weather station BZ06 and particle measuring device BQ30

Our recommendation for climate control:

The design weather station BZ06
Simultaneous indication of room temperature, humidity level, date, time, weekday and symbolic weather forecast. Supplies helpful information for preventing mould growth.

The particle measuring device BQ30
Long-term air quality monitor for simultaneous detection of particle mass concentration in the air, particularly suitable for allergy sufferers. The CO2 load, current room temperature and room humidity level are also displayed.

SecoSan, descaler and LiQVit

Care and protection from Trotec:

Water pollution control "made in Germany" with unique SecoSan operating principle. Long-term protection against microbial, algae, mould and bacterial growth lasting up to 6 months.

Liquid descaler based on amidosulphonic acid with colour indicator and maleic acid content to prevent re-calcification. Universally suitable for humidifiers, air conditioners, fully automated coffee machines and other hot water appliances. Especially suitable for use with calcareous water.

For maintaining the quality of the evaporated water in the humidifier at a constantly high level: the water hygiene agent LiQVit. Exclusively available only at Trotec! LiQVit serves to prevent microbial, algae, mould and bacterial growth as well as consequential odour formation.

 standard equipment

 optionally available

 not available


Luftwäscher / Airwasher AW 20 S show in Trotec online shop

Luftwäscher / Airwasher AW 20 S

You save: 114.01 €

499.00 € 384.99 € incl. VAT Show net price (VAT not included)



Technical data
General information
  Article number
Humidification performance
  Max. humidification performance [ml/h] 750 ml/h
Air flow rate
  Level Max. [m³/h] 228
Electrical values
  Mains connection 230 V, 50 Hz
  Power input [W] 24
Electric connection
  Connection plug CEE 7/16
  Cable length [m] 1.7
Recommended room size
Water tank
  Contents [l] 9
Sound values
  Level min. - Distance 1 m [dB(A)] 25
  Level Max. - Distance 1 m [dB(A)] 47
  stages 3
  Length (packaging excluded) [mm] 410
  Width (packaging excluded) [mm] 325
  Height (packaging excluded) [mm] 420
  (packaging excluded) [kg] 10
Equipment, features and functions
Housing design
Functions and features
  Humidification function can be switched on or off separately
  99.97 % effective HEPA filtering of pollen, dust mite residue, mould fungus spores and other allergens
  Pre-filter (replaceable) for higher filter efficiency
  HEPA function can be switched on or off as needed
  Effective functional principle without limescale or wet spots
  Combined air quality and humidity sensor for automatic control
  Noiseless night operation in whisper mode
  Water filling level indicator
  Automatic switch-off when water tank is empty
  Operating modes 9

 standard equipment

 optionally available

 not available



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