1. Introduction
Thank you for choosing the Dreo 11L Smart Humidifier HM735S. This manual provides important information regarding the safe operation, maintenance, and troubleshooting of your new humidifier. Please read it thoroughly before use and retain it for future reference.
Important Safety Instructions
- Always place the humidifier on a firm, flat, water-resistant surface at least 12 inches (30 cm) away from walls and appliances.
- Do not place the humidifier directly on carpet, rugs, or absorbent surfaces.
- Ensure the power cord is not pinched or damaged.
- Use only clean, cool tap water or distilled water. Do not add essential oils directly into the water tank; use the aroma box.
- Unplug the humidifier before filling, cleaning, or moving it.
- Keep out of reach of children and pets.
2. Product Overview
The Dreo 11L Smart Humidifier HM735S is designed to provide efficient and quiet humidification for large rooms. It features smart controls, a large capacity tank, and an aroma box for enhanced comfort.
Package Contents
- Dreo 11L Humidifier (HM735S) x1
- Aroma Pad x1
- Cleaning Brush x1
- Screw x1
- User Manual x1
Product Diagram

This image displays the humidifier unit, its remote control, and a smartphone screen illustrating the mobile application interface. The humidifier is a tall, white tower with a digital display at the top, indicating current humidity and settings. A blue light strip runs vertically along the front, showing the water level. The remote control has several buttons for power, mist level, and mode selection. The app interface mirrors these controls, allowing for smart operation.
Specifications
| Feature | Detail |
|---|---|
| Brand | Dreo |
| Model Name | HM735S (DR-HHM005S) |
| Capacity | 11 Liters (2.9 Gallons) |
| Coverage Area | Up to 700 sq ft |
| Max Runtime | 100 hours |
| Noise Level | 26dB (Sleep Mode) |
| Operation Mode | Ultrasonic |
| Special Features | Aroma Diffuser, Digital Display, Easy Top-Fill, Night Light, Removable Tank, Smart Control (App/Voice/Remote) |
| Dimensions (D x W x H) | 10.24" x 8.86" x 30.91" |
| Item Weight | 5.94 lbs |
| Voltage | 120 Volts |
3. Setup
3.1 Unpacking and Placement
- Carefully remove all packaging materials from the humidifier.
- Place the humidifier on a flat, stable surface. Ensure it is at least 12 inches (30 cm) away from walls, furniture, and electronic devices.
- Avoid placing the unit on carpets or surfaces that may be damaged by moisture.
3.2 Filling the Water Tank

This image highlights several key features of the humidifier. The top-fill design is shown with water being poured directly into the top opening. Other panels illustrate the self-cleaning tank with a hexagonal pattern, a 360° adjustable mist outlet, a 12-hour timer function, a scale-inhibitor cartridge, the included remote control, and the customizable RGB night light options.
- Ensure the humidifier is unplugged.
- Remove the top cover of the humidifier.
- Pour clean, cool tap water or distilled water directly into the water tank. Do not exceed the maximum fill line indicated on the unit.
- Replace the top cover securely.
3.3 Power Connection
- Plug the power cord into a standard 120V AC electrical outlet.
- The unit will emit a beep, and the display will illuminate briefly.
4. Operation
4.1 Control Panel
The control panel is located on the top front of the humidifier and features a digital display and touch-sensitive buttons.
- Power Button: Turns the humidifier On/Off.
- Mist Level Button: Adjusts mist output (Low, Medium, High).
- Mode Button: Cycles through Auto, Sleep, and Manual modes.
- Humidity Setting Button: Sets desired humidity level in Auto mode.
- Timer Button: Sets an auto-off timer (1-12 hours).
- Light Button: Controls the RGB night light.
4.2 Remote Control
The included remote control allows for convenient operation from a distance. It mirrors most functions of the control panel.

This image illustrates the various ways to control the Dreo humidifier. The main unit is visible in the background, emitting mist. In the foreground, a hand holds a smartphone displaying the Dreo app, which shows options for humidity control, scheduling, and cleaning reminders. Next to the phone is the physical remote control, featuring buttons for power, mist level, and other settings. This highlights the flexibility of controlling the device via app, remote, or directly on the unit.
4.3 Smart Control (Dreo App & Voice Control)
The humidifier can be controlled via the Dreo app on your smartphone or through voice commands with compatible smart assistants (Alexa, Google Assistant).
- Download the Dreo App: Search for "Dreo" in your smartphone's app store and install it.
- Pairing: Follow the in-app instructions to pair your humidifier via Bluetooth, then connect it to your Wi-Fi network.
- Voice Control Setup: Link your Dreo account with Amazon Alexa or Google Home apps to enable voice commands.

This image showcases the Dreo mobile application's capabilities for controlling the humidifier. The app displays current humidity levels, allows users to set schedules for operation, and provides cleaning reminders. The humidifier itself is shown in the background, emphasizing the seamless integration between the physical device and its smart control interface.
4.4 Operating Modes
- Auto Mode: The humidifier automatically adjusts mist output to maintain a preset humidity level.
- Sleep Mode: Operates at the lowest mist level with minimal noise (26dB) and turns off display lights for undisturbed rest.
- Manual Mode: Allows manual selection of mist levels (Low, Medium, High, or up to 6 levels via app).

This image depicts the humidifier in a dimly lit bedroom setting, suggesting its quiet operation during nighttime. The unit is emitting a gentle mist, and the text highlights its ultra-quiet 26dB noise level, making it suitable for use while sleeping.
4.5 Aroma Box
To use the aroma function, locate the aroma box on the side or back of the unit. Add a few drops of essential oil onto the aroma pad (do not add oils directly into the water tank). The mist will then carry the fragrance into the air.
5. Maintenance
Regular cleaning and maintenance are crucial for optimal performance and longevity of your humidifier.
5.1 Daily Maintenance
- Empty and rinse the water tank daily.
- Wipe the base and mist outlet with a clean, dry cloth.
5.2 Weekly Cleaning
- Unplug the humidifier.
- Remove the top cover and water tank.
- Pour 1 cup (240ml) of white vinegar into the water tank and base. Let it soak for 20 minutes.
- Use the provided cleaning brush to clean the nebulizer and other hard-to-reach areas.
- Rinse all components thoroughly with clean water until the smell of vinegar is gone.
- Dry all parts completely before reassembling.
5.3 Demineralization Cartridge Replacement
The Dreo Demineralization Cartridge helps reduce mineral buildup and white dust. It is recommended to replace it monthly, or more frequently depending on water hardness and usage.
- To replace, remove the old cartridge from the water draw tube in the base.
- Install a new Dreo demineralization cartridge (search for "dreo demineralization cartridge" for purchase).
5.4 Storage
- Clean and dry the humidifier thoroughly before storing.
- Store in a cool, dry place, away from direct sunlight.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or low mist output |
|
|
| White dust around humidifier | Hard water used | Use distilled or demineralized water. Replace demineralization cartridge. |
| Unpleasant odor from mist |
|
|
| Humidifier leaks water |
|
|
| Error Code E1 | Faulty humidity sensor | Contact Dreo Customer Service for assistance. |
7. Warranty and Customer Support
Dreo products come with a manufacturer's warranty. For specific warranty details, please refer to the warranty card included with your product or visit the official Dreo website.
If you encounter any issues or have questions regarding your Dreo 11L Smart Humidifier HM735S, please contact Dreo Customer Support:
- Website: www.dreo.com
- Email: Refer to your warranty card or website for contact email.
- Phone: Refer to your warranty card or website for contact number.
Please have your model number (HM735S) and proof of purchase ready when contacting support.







