Philips 4000 series HU4210/03 Ultrasound air humidifier grey

The Philips 4000 Series Air Humidifier is designed to maintain healthy indoor humidity levels while operating quietly and efficiently. It uses NanoCloud evaporative technology, which ensures hygienic humidification by releasing ultra-fine water particles that are less likely to carry bacteria or leave white dust.

With a 3.5 L water tank, the device provides up to 21 hours of continuous operation, making it suitable for bedrooms and living spaces. It delivers a humidification rate of up to 300 ml/h, effectively covering rooms up to approximately 44 m².

The humidifier operates very quietly (around 6–25 dB depending on mode) and includes automatic humidity control, sleep mode, and timer functions. Its low power consumption (around 3 W) makes it energy efficient for long-term use.

The charcoal grey finish gives it a modern, neutral look that fits well into any interior.

Technical Specifications:


Type: Ultrasonic / evaporative (NanoCloud)

Water tank capacity: 3.5 L

Humidification output: up to 300 ml/h

Coverage area: up to ~44 m²

Power: 3 W

Noise level: ~6–25 dB

Runtime: up to 21 hours

Modes: Auto / Sleep / Manual

Functions: Timer, humidity control, auto shut-off

Technology: NanoCloud hygienic evaporation

Colour: Charcoal Grey