Introduction
Welcome to your new BONECO U250 Humidifier. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your device. The BONECO U250 is designed to take the guesswork out of home humidity, featuring an AUTO mode for optimal humidity levels.
Important Safety Instructions
- Read all instructions before using the appliance.
- Do not operate any appliance with a damaged cord or plug.
- Keep the power cord away from heated surfaces.
- Do not use outdoors.
- Always unplug the humidifier when not in use or before cleaning.
- Do not block air openings.
- Use only as described in this manual.
- This appliance has a polarized plug (one blade is wider than the other).
Product Overview
The BONECO U250 is a compact and efficient ultrasonic humidifier.
Components
- Water Tank
- Base Unit with Control Panel
- Water Filter (2-in-1)
- Cleaning Brush
- Power Cord

Front view of the BONECO U250 Humidifier, showcasing its sleek white design and central water level indicator.

Diagram illustrating the dimensions of the BONECO U250 Humidifier: 10.4 inches high, 9.4 inches wide, and 4.7 inches deep.

Exploded view of the BONECO U250 Humidifier, showing the water tank, base, water filter, and cleaning brush as separate components.
Setup
- Unpacking: Carefully remove all components from the packaging.
- Placement: Place the humidifier on a firm, level, water-resistant surface. Ensure it is not placed directly on carpet or near heat sources.
- Fill Water Tank:
- Remove the water tank from the base.
- Unscrew the cap at the bottom of the tank.
- Fill the tank with clean, cool tap water. Distilled or demineralized water is recommended to prevent mineral buildup.
- Securely replace the cap.
- Insert Water Tank: Place the filled water tank back onto the base unit.
- Connect Power: Plug the power cord into a suitable electrical outlet.

The BONECO U250 Humidifier with its top section removed, revealing the internal water reservoir and components.

Top view of the BONECO U250 Humidifier's water tank, showing the integrated handle for easy carrying and refilling.
Operating Instructions
Power On/Off
Press the power button on the control panel to turn the humidifier on or off.
Mist Output Control
Rotate the knob on the front panel to adjust the mist output level from minimum to maximum.
AUTO Mode
The BONECO U250 features an AUTO mode that automatically adjusts the mist output to maintain an optimal humidity level in your room.
Low Water Indicator
The indicator light will illuminate when the water level in the tank is low, signaling that a refill is needed. The unit will automatically shut off when the water tank is empty.

Close-up of the BONECO U250 Humidifier's control panel, showing the mist output dial, auto mode button, and power button.

Rear view of the BONECO U250 Humidifier, highlighting the access panel for the water filter and the power input.
Maintenance
Regular cleaning and maintenance are crucial for optimal performance and longevity of your BONECO U250 Humidifier.
Daily Maintenance
- Empty and rinse the water tank and base daily.
- Refill with fresh water.
Weekly Cleaning
- Unplug the unit and empty all water.
- Remove the water filter.
- Clean the water tank and base with a soft brush and mild detergent.
- Rinse thoroughly to remove any residue.
- Use the provided cleaning brush to clean hard-to-reach areas.
Water Filter Replacement
The 2-in-1 water filter should be replaced regularly, depending on water hardness and usage. Refer to the filter packaging for specific replacement intervals.

Rear view of the BONECO U250 Humidifier with the filter access panel open, showing the removable water filter cartridge.

Internal view of the BONECO U250 Humidifier's base, showing the ultrasonic membrane and water channels, with the cleaning brush stored underneath.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No Mist Output | Low water level | Refill water tank. |
| No Mist Output | Unit not plugged in | Ensure power cord is securely plugged into an outlet. |
| No Mist Output | Ultrasonic membrane dirty | Clean the ultrasonic membrane as per maintenance instructions. |
| Unusual Odor | Stagnant water | Empty and clean the water tank and base. Use fresh water. |
| White Dust Around Unit | Hard water minerals | Use distilled or demineralized water. Replace water filter if necessary. |
Specifications
| Feature | Detail |
|---|---|
| Brand | BONECO |
| Model Name | U250 (cool mist humidifier) |
| Item Model Number | 310739 |
| Special Feature | Auto Shut Off, Quiet |
| Filter Type | Antimicrobial |
| Floor Area | 480 Square Feet |
| Operation Mode | Ultrasonic |
| Product Dimensions | 4.7"D x 9.4"W x 10.4"H |
| Item Weight | 5 Pounds |
| Room Type | Bedroom, Living Room, Office |
| Included Components | Water filter, User manual, Cleaning brush, Power cord |
| Voltage | 120 Volts (AC) |
| Shape | Rectangular |
| UPC | 834546002163 |
| Manufacturer | Boneco |
Warranty and Support
The BONECO U250 Humidifier comes with a 3-year warranty. For warranty claims or technical support, please contact BONECO customer service.
Additional protection plans are available for purchase:
- 3-Year Protection Plan: $11.99
- 4-Year Protection Plan: $15.99
- Complete Protect (monthly): $16.99/month
For more information, visit the official BONECO website or refer to the contact details provided in your product packaging.





