Introduction
Thank you for choosing the Dreo HM735S Smart Humidifier. This manual provides essential information for the safe operation, maintenance, and troubleshooting of your new humidifier. Please read it thoroughly before use and retain it for future reference.

Image: The Dreo HM735S Smart Humidifier, showcasing its sleek design, digital display, and accompanying remote control and smartphone app interface.
Important Safety Instructions
To reduce the risk of fire, electric shock, or injury, always follow basic safety precautions when using this appliance.
- 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, towels, or other absorbent surfaces.
- Always unplug the humidifier before moving, cleaning, or refilling the water tank.
- Do not immerse the humidifier in water or other liquids.
- Use only clean, cool tap water or distilled water. Do not add essential oils directly into the water tank; use the designated aroma pad tray.
- Keep out of reach of children and pets.
- Do not block the mist outlet or air intake.
- If the humidifier emits unusual sounds, smells, or smoke, unplug it immediately and contact customer support.
Product Overview
Components
- Main Humidifier Unit (with digital display and controls)
- Water Tank (11L / 2.9 Gallon capacity)
- Mist Outlet (360° adjustable)
- Remote Control
- Aroma Pad Tray
- Cleaning Brush
- Demineralization Cartridge (pre-installed or included)

Image: Diagram illustrating the dimensions of the Dreo HM735S Humidifier: 30.91 inches height, 8.86 inches width, and 10.24 inches depth.
Setup
Initial Setup
- Unpack the humidifier and all accessories. Remove any packaging materials.
- Place the humidifier on a flat, stable surface. Ensure it is not near heat sources or direct sunlight.
- Ensure the demineralization cartridge is properly installed in the water tank.
Filling the Water Tank
The HM735S features a convenient top-fill design.
- Ensure the humidifier is unplugged.
- Carefully pour clean, cool tap water or distilled water directly into the top opening of the water tank until it reaches the MAX fill line. Do not overfill.
- For aromatherapy, add a few drops of essential oil to the aroma pad tray located at the base of the unit. Do not add oils directly into the water tank.

Image: The Dreo HM735S Humidifier highlighting its large 11-liter (2.9-gallon) tank capacity, capable of providing up to 100 hours of continuous mist.
Operating Instructions
Powering On/Off
- Plug the power cord into a 120V AC outlet.
- Press the Power button on the control panel or remote control to turn the unit on or off.
Control Methods
The HM735S can be controlled via its touch control panel, remote control, or the Dreo Home App.
- Touch Control Panel: Use the intuitive touch buttons on the unit's display to adjust settings.
- Remote Control: The included remote allows for convenient control from a distance.
- Dreo Home App: Download the Dreo Home App from your smartphone's app store. Follow the in-app instructions to connect your humidifier for smart control, scheduling, and monitoring. The humidifier supports voice control via Alexa and Google Assistant when connected to the app.

Image: A hand holding a smartphone displaying the Dreo app interface for the humidifier, showing humidity control, scheduling, and compatibility with Alexa and Google Assistant.
Operating Modes & Settings
- Manual Mode: Adjust mist output levels (up to 6 levels via app).
- Auto Mode: The humidifier automatically adjusts mist output to maintain a preset humidity level (30-90% RH range).
- Sleep Mode: Reduces noise to 26dB and dims the display for undisturbed rest.
- Timer: Set the humidifier to turn off automatically after a specified period (up to 12 hours).
- RGB Night Light: Customize the color of the ambient light for a soothing atmosphere.

Image: The Dreo HM735S Humidifier in a bedroom, illustrating its ultra-quiet operation at 26dB, ideal for restful nights.

Image: Close-up views of additional features of the Dreo HM735S Humidifier, including its Ag+ coated tank for cleaner mist, customizable RGB light, and convenient aroma pad tray.
Maintenance
Regular cleaning and maintenance are crucial for optimal performance and hygiene.
Daily Maintenance
- Empty and rinse the water tank daily.
- Wipe down the mist outlet and exterior surfaces with a clean, damp cloth.
Weekly Cleaning
- Unplug the humidifier.
- Remove the water tank and empty any remaining water.
- Clean the water tank and base with a soft brush and mild detergent. Rinse thoroughly.
- To remove mineral buildup (scale), fill the tank with a mixture of equal parts white vinegar and water. Let it soak for 30 minutes, then scrub with the cleaning brush and rinse well.
- Wipe the transducer (atomizer) and heating element (if applicable) with a soft cloth. Do not scratch or damage these components.
- Ensure all parts are completely dry before reassembling.
Demineralization Cartridge Replacement
The demineralization cartridge helps reduce white dust caused by hard water. It is recommended to replace the cartridge monthly, or more frequently depending on water hardness and usage.
- Search for "dreo demineralization cartridge" to purchase replacements.
- Follow the instructions provided with the new cartridge for installation.
Troubleshooting
Before contacting customer support, please refer to the following common issues and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or low mist output. | Low water level; clogged transducer; mist outlet blocked. | Refill water tank; clean transducer; ensure mist outlet is clear. |
| Unusual odor. | Stagnant water; dirty tank; new unit smell. | Clean tank thoroughly; change water daily; odor should dissipate after initial use. |
| White dust around humidifier. | Hard water minerals. | Use distilled water; replace demineralization cartridge. |
| Humidifier not turning on. | Not plugged in; power outage; unit malfunction. | Check power connection; verify power supply; contact support if issue persists. |
| App connectivity issues. | Wi-Fi signal weak; incorrect pairing steps. | Ensure strong 2.4GHz Wi-Fi; re-attempt pairing process as per app instructions. |
Specifications
| Brand | Dreo |
| Model Name | HM735S |
| Item Model Number | DR-HHM005S White |
| UPC | 810142852081 |
| Tank Capacity | 11 Liters (2.9 Gallons) |
| Max Runtime | Up to 100 hours |
| Coverage Area | Up to 700 ft² |
| Mist Height | Over 6 ft. (with 3,900 RPM motor) |
| Noise Level | 26dB (in Sleep Mode) |
| Atomization Frequency | 2.4MHz (5µm ultrafine mist) |
| Control Method | App, Remote, Touch, Voice (Alexa, Google Assistant) |
| Product Dimensions | 10.24"D x 8.86"W x 30.91"H |
| Item Weight | 5.94 Pounds |
| Voltage | 120 Volts |
| Special Features | Aroma Diffuser, Digital Display, Easy Top-Fill, Night Light, Removable Tank, Smart Control, Ag+ Coated Tank |
Warranty and Support
Warranty Information
The Dreo HM735S Smart Humidifier comes with a 12-month default warranty. This warranty can be extended up to 30 months by registering your product. Please visit the official Dreo website for product registration details and terms and conditions.
Customer Support
For any questions, concerns, or technical assistance, please contact Dreo Customer Support. Refer to the official Dreo website or the contact information provided in your product packaging for the most up-to-date support channels.
You can also find the official User Manual (PDF) for this product at: Dreo HM735S User Manual PDF





