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Key Features
- NanoCloud technology releases 99% less bacteria than standard humidifiers, ideal for baby rooms.
- Relieves dry skin, lips, nasal passages, and throat irritation for improved comfort.
- Up to 300 ml/h emission effectively humidifies rooms up to 44 m2.
- 3.5L water reservoir provides up to 21 hours of continuous humidification with minimal refills.
- No white dust or wet patches, preventing residue and stains on surfaces.
Philips 4000 Series Air Humidifier, White HU4210/04

Combat dry air symptoms hygienically, powered by NanoCloud technology. Engineered to protect you and your family from inhaling harmful bacteria while enjoying all the benefits of aromatherapy, and smart app control.
Key Features:
Combat dry air symptoms
Balanced humidity levels enhance perceived air quality 1. This humidifier is designed to relieve discomfort from dry air, such as dryness of the skin, lips, nasal passages, and eyes, throat irritation, congestion, and static electricity, while also keeping indoor plants hydrated for a healthier home.
Continuous humidification
Breathe comfortably with minimal refills. The 3.5L water reservoir offers up to 21h of continuous use for your convenience. Enjoy a comfortable atmosphere with fewer interruptions.
NanoCloud Technology
There is no other technology that releases cleaner water vapor into the air than Philips NanoCloud. Its ultra-fine mist is extremely difficult for bacteria to adhere to. The advantage is air humidification with up to 99% less bacteria releases than standard ultrasonic humidifiers 4, making this humidifier an ideal solution for baby rooms.
No white dust or wet strains
NanoCloud's invisible mist does not release white dust or leave wet patches 5. Large droplets emitted by ultrasonic humidifiers may dampen the surroundings and carry minerals that leave white residue on nearby surfaces. NanoCloud particles are too small to carry minerals, effectively preventing residue and stains.
1 Wolkoff, P. (2018) Indoor air humidity, air quality, and health-and overview. Elsevier, International Journal of Environmental Health, 221 (3), 376-390.
2 Tested by GB/T 23332-2018 in a third-party laboratory. Initial temperature of 23±2° and relative humidity of 30±2% RH.
3 Calculated using AHAM HU-1-2016 Clause 7.3 based upon the humidification performance tested according to GB/T 23332-2018 in a third-party laboratory.
4 Compared to standard ultrasonic humidifier modules that do not contain additional technology to reduce the spread of bacteria, as tested by an independent lab
5 Deposition of minerals on furniture was tested by a third-part laboratory over a period of 3 hours according to DIN 44973, CAS Testing.
Specifications
Global
- EAN:
- 8720389071881
- Model Number:
- HU4210/04
General
- Colour:
- White
- Made In:
- CHINA
Features
- Remote Control:
- No
- Removable Water Tank:
- No
- Timer:
- No
- Visible Water Level:
- No
Design
- Water Tank Capacity:
- 3.5
Energy Specification/Power
- Power (W):
- 3watts
Dimensions
- Depth:
- 222mm
- Height:
- 334mm
- Width:
- 219mm
Weight
- Box Weight (Kg):
- 2.35
- Weight (Kg):
- 1.43
In The Box & Warranty
- Included:
- Humidification filter, 3 x Aroma pads
- Warranty (Years):
- 2
Other
- Box Depth (mm):
- 265
- Box Height (mm):
- 390
- Box Width (mm):
- 265
Manuals
Why Buy?
Comfortable, hygienic humidity for dry indoor air
The Philips 4000 series humidifier tackles the dry skin, scratchy throat and congestion that come with heated or air-conditioned rooms, using NanoCloud technology that releases up to 99 percent less bacteria than standard ultrasonic humidifiers.
Instead of a visible mist, this humidifier releases fine water vapour into the air, so you get balanced moisture without white dust settling on furniture or damp patches on nearby surfaces. It covers rooms up to 44 square metres, with three fan speeds plus an automatic setting so you can dial in the comfort level or let it manage itself. The 3.5-litre tank holds enough water for up to 21 hours of continuous running, which means fewer top-ups and fewer interruptions to your sleep or work.
Compact at 219mm wide, it sits easily on a bedside table, desk or living room shelf without taking over the space. Running on just 3 watts, it costs very little to keep going day and night, and the quiet operation makes it easy to leave on overnight in a bedroom or nursery without disturbing anyone.
Buy this if…
- You wake up with dry skin, a scratchy throat or blocked sinuses
- You want a humidifier that limits bacteria rather than spreading it
- Your household deals with static electricity and dry air over winter
- You need long, quiet operation overnight in a bedroom or nursery
- You prefer a low-maintenance appliance that runs itself on automatic mode

























