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Key Features
- Combat dry air symptoms like irritated skin, lips, or nasal passages.
- NanoCloud technology releases ultra-fine mist with 99% less bacteria.
- No white dust or wet stains left on surfaces for a cleaner home.
- Provides up to 21 hours of continuous humidification from a 3.5L tank.
- Effectively humidifies rooms up to 44 m2 with up to 300 ml/h output.
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?
Cleaner, balanced humidity for dry indoor air
This Philips 4000 series evaporative air humidifier eases the dry skin, scratchy throat and blocked sinuses that come with heated or air-conditioned rooms, using NanoCloud technology that releases up to 99 percent less bacteria than a standard ultrasonic humidifier.
Rather than spraying a visible mist, it draws air through a humidification filter and releases fine water vapour, so you get steady moisture in the room without white dust settling on furniture or damp patches nearby. Three fan speeds plus an automatic setting let you set the comfort level yourself or leave the humidifier to manage it, covering rooms up to 44 square metres. The 3.5-litre tank holds enough water for up to 21 hours of continuous running, so there are fewer top-ups and fewer interruptions to sleep or work. It comes with a humidification filter and three aroma pads, letting you add a light scent to the airflow if you like.
Compact at 219mm wide, this Philips humidifier sits comfortably on a bedside table, desk or shelf without crowding the room. Running on just 3 watts, it is cheap to leave on around the clock, and quiet enough to run 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









