Humidifier Philips HU4210/04 Ultrasonic 3.5 L White, 3 W, AC 100–240 V

Philips HU4210/04 Ultrasonic 3.5 L is a compact white tabletop humidifier designed to increase indoor air moisture in homes and small offices. The unit features a 3.5 litre top-fill water tank and ultrasonic NanoCloud humidification to deliver fine water vapour with reduced bacterial release. With simple controls and quiet operation, the humidifier supports continuous use to improve comfort and help reduce symptoms associated with dry indoor air.

Advantages

Ultrasonic NanoCloud technology produces very fine vapour while minimising the release of bacteria and preventing visible white dust or wet spots on surfaces. The device provides up to 300 ml/h humidification output and a runtime of up to 21 hours from the 3.5 L tank, allowing prolonged continuous operation with low power consumption (around 3 W). Multiple fan speeds plus an automatic mode and a dedicated sleep setting enable quiet night-time use. A top-fill design, washable components and a long-life filter simplify maintenance.

Suitable for

• Maintaining comfortable humidity in living rooms and bedrooms
• Reducing dry-skin, dry-eyes and throat irritation caused by dry indoor air
• Humidifying rooms up to approximately 44 m²
• Use in children's rooms where lower bacterial release is preferred
• Aromatherapy with added essential oils (use designated compartment)

Key specifications

• Humidification method: ultrasonic with NanoCloud technology
• Maximum output: up to 300 ml/h
• Water tank capacity: 3.5 L (top-fill)
• Coverage area: suitable for rooms up to ~44 m²
• Fan speeds: 3 manual speeds plus automatic setting
• Noise level: sleep mode down to approximately 6 dB
• Power consumption: low, typical maximum around 3 W
• Runtime: up to 21 hours continuous operation
• Filter: long-life filter with service interval up to ~6 months

How to use

Remove the top-fill water tank, fill it with tap water and securely replace the lid. Place the humidifier on a stable, level surface, plug into AC 100–240 V supply and select the required fan speed or automatic mode to reach the desired humidity. For night-time operation, select sleep mode to minimise noise. If aromatherapy is required, add a few drops of essential oil to the designated aroma compartment only. Follow the maintenance schedule to clean washable parts and replace the long-life filter as needed to maintain performance.

Usage recommendations

Position the humidifier on a stable, level surface away from direct sunlight and heat sources and allow several centimetres of clearance around the unit. Use tap water for routine operation and perform regular cleaning to prevent buildup. When using essential oils, follow the manufacturer’s guidance for amounts and clean the aroma compartment regularly to avoid residue. Monitor indoor humidity with a hygrometer and aim for comfortable levels (typically 40–60%) to prevent over-humidification.