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Product Highlights
- Removable Water Tank: No
- Visible Water Level: No
- Warranty (Years): 2
- Water Tank Capacity: 3.5
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
Description
- Search Snippet: The Philips HU4210/04 Air Humidifier features NanoCloud technology that releases 99% fewer bacteria than standard ultrasonic models.
Global
- EAN: 8720389071881
- Model Number: HU4210/04
General
- Colour: White
- Made In: CHINA
Features
- Aromatherapy Support: Yes
- Cooling Function: No
- Remote Control: No
- Removable Water Tank: No
- Timer: No
- Visible Water Level: No
Design
- Water Tank Capacity: 3.5
Safety Features
- Auto Off: Yes
Control Features
- Smart Control: Yes
Energy Specification/Power
- Power (W): 3watts
Sensors
- Sensor Types: Humidity sensor
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?
Breathe easier with cleaner, healthier humidity all winter long
This Philips humidifier transforms dry, stuffy air into comfortable humidity that helps you sleep better and feel healthier every day. The NanoCloud technology releases 99% fewer bacteria than standard ultrasonic humidifiers, so you can breathe cleaner air while enjoying relief from dry skin, scratchy throats, and irritated sinuses.
No more waking up parched or dealing with static electricity zapping you around the house. The generous 3.5-litre tank runs for up to 21 hours without refilling, quietly covering rooms up to 44 square metres with invisible mist that never leaves white dust on your furniture or wet spots on surfaces. Three adjustable fan speeds let you customise the moisture output, while automatic mode maintains ideal humidity without any fuss from you.
At just 22cm wide, it fits comfortably on bedside tables or shelves, running so quietly you will barely notice it working. The low 3-watt energy consumption keeps running costs minimal, while the clean design blends into any room without dominating your space.
Buy this if…
- You wake up with dry throat, skin, or nasal congestion
- You want bacteria-free humidification for family peace of mind
- Your home suffers from winter dryness and static electricity
- You need quiet, overnight operation in bedrooms up to 44 square metres
- You prefer low-maintenance appliances that work automatically














