Introduction
The Vicks VWM845 Warm Mist Humidifier is designed to quietly release warm, soothing vapor into the air, providing temporary relief from cough and congestion. This filter-free humidifier helps create a comfortable breathing environment, reducing respiratory discomfort for better sleep. It features a medicine cup for use with Vicks VapoSteam and a scent pad door for Vicks VapoPads, enhancing comfort with soothing vapors.

Image: The Vicks VWM845 Warm Mist Humidifier, a white unit with a translucent blue water tank, shown from an angled front view.
Important Safety Information
Please read and save these important safety instructions before using this humidifier. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always place the humidifier on a firm, flat, water-resistant surface at least 12 inches (30 cm) away from walls and 3 feet (0.9 m) from heat sources.
- Do not place the humidifier directly on carpet, a finished floor, or near furniture that can be damaged by water or moisture.
- Do not operate the humidifier without water in the tank.
- Do not add essential oils, medications, or other additives directly into the water tank or base. Use only the designated medicine cup or scent pad door.
- Unplug the humidifier before filling, cleaning, or moving it.
- Keep out of reach of children and pets.
- Do not block air vents.
- Do not immerse the humidifier in water or other liquids.
- Regular cleaning is essential to prevent mineral buildup and bacterial growth.
Parts Identification
Familiarize yourself with the components of your Vicks Warm Mist Humidifier.

Image: An infographic highlighting key features of the Vicks VWM845 Warm Mist Humidifier, including Comfortable Warm Mist, Medicine Cup, Up to 24 Hour Runtime, 1.0 Gallon Capacity, Filter Free Operation, and Use with VapoPads.
| Part | Description |
|---|---|
| Water Tank | Holds water for mist production. Features a wide opening for easy filling and cleaning. |
| Base Unit | Contains the heating element and control knob. |
| Medicine Cup | Located on top of the unit, designed for use with liquid inhalants like Vicks VapoSteam. |
| Scent Pad Door | Compartment for inserting Vicks VapoPads to release soothing vapors. |
| Control Knob | Used to turn the unit on/off and select mist output level. |
| Mist Outlet | Where the warm mist is released into the air. |
Setup
- Unpack: Carefully remove the humidifier from its packaging. Retain packaging for storage.
- Placement: Place the humidifier on a firm, level, water-resistant surface. Ensure it is at least 12 inches (30 cm) from walls and 3 feet (0.9 m) from heat sources. Do not place on carpet or directly on furniture that can be damaged by moisture.
- Fill Water Tank:
- Remove the water tank from the base.
- Turn the tank upside down and unscrew the tank cap.
- Fill the tank with cool, fresh tap water. Distilled water is recommended in hard water areas to minimize mineral buildup.
- Securely replace the tank cap.
- Place the filled water tank back onto the humidifier base, ensuring it is seated correctly.
- Power Connection: Plug the power cord into a 120V AC electrical outlet.
Operating Instructions
Once set up, operating your Vicks Warm Mist Humidifier is straightforward.
Basic Operation
- Turn On: Turn the control knob clockwise to the desired mist setting (Low or High). The power indicator light will illuminate.
- Mist Output: The humidifier will begin producing warm mist within a few minutes. Adjust the control knob to increase or decrease the mist output as desired.
- Auto Shut-Off: The unit will automatically shut off when the water tank is empty. The power indicator light will turn off.
- Refill: To continue operation, unplug the unit, refill the water tank as per the Setup instructions, and plug it back in.

Image: The Vicks VWM845 Humidifier placed on a shelf in a bedroom, demonstrating its quiet operation and dual mist settings for comfort.
Using Vicks VapoSteam (Sold Separately)
For added cough relief, you can use Vicks VapoSteam in the designated medicine cup.
- Ensure the humidifier is turned off and unplugged.
- Carefully pour Vicks VapoSteam into the medicine cup located on top of the unit. Do not exceed the maximum fill line.
- Plug in and turn on the humidifier. The medicated vapors will be released with the mist.
- Do not add VapoSteam directly into the water tank.

Image: A hand pouring Vicks VapoSteam liquid into the blue medicine cup located on the top of the humidifier.
Using Vicks VapoPads (One Sample Included)
For soothing, non-medicated vapors, insert Vicks VapoPads into the scent pad door.
- Ensure the humidifier is turned off and unplugged.
- Open the scent pad door located on the front of the unit.
- Insert up to two Vicks VapoPads into the slots.
- Close the scent pad door securely.
- Plug in and turn on the humidifier. The soothing vapors will be released with the mist.
- Replace VapoPads after 8 hours or when scent is no longer detectable.

Image: A hand inserting a Vicks VapoPad into the designated scent pad compartment on the side of the humidifier.
Maintenance
Regular cleaning is crucial for optimal performance and hygiene of your humidifier. Unplug the unit before any cleaning.
Daily Maintenance
- Empty the water tank and base.
- Rinse the water tank and base thoroughly with cool water.
- Wipe all surfaces dry with a clean cloth.
- Leave the tank cap off and the scent pad door open to allow air drying when not in use.
Weekly Maintenance (Mineral Deposit Removal)
- Descaling the Heating Element:
- Unplug the humidifier.
- Remove the water tank.
- Pour 2 cups of undiluted white vinegar into the water reservoir (base) and let it stand for 20 minutes.
- Gently scrub the heating element with a soft brush to remove mineral deposits.
- Empty the vinegar solution and rinse the base thoroughly with clean water.
- Cleaning the Water Tank:
- Add 2 tablespoons of white vinegar to the water tank and fill with water.
- Shake vigorously and let stand for 20 minutes.
- Empty the tank and rinse thoroughly with clean water.
End of Season Storage
- Perform weekly cleaning as described above.
- Ensure all parts are completely dry before storing.
- Store the humidifier in a cool, dry place.
Troubleshooting
If your humidifier is not operating correctly, consult the following table for common issues and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on. | No power; Tank not seated correctly; Unit empty. | Check power cord connection; Ensure tank is properly seated; Refill water tank. |
| No mist or very little mist. | Water tank empty; Mineral buildup on heating element. | Refill water tank; Perform weekly descaling of heating element. |
| Unusual odor. | New unit odor; Dirty water or tank. | Initial odor will dissipate; Clean tank and base thoroughly; Use fresh water. |
| White dust around humidifier. | Hard water mineral content. | Use distilled or demineralized water; Clean unit regularly to remove mineral buildup. |
| Gurgling noise. | Normal operation as water flows from tank to base. | This is normal and indicates the unit is functioning. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | VWM845 |
| Capacity | 1 Gallon (approx. 3.78 Liters) |
| Runtime | Up to 24 hours (on low setting) |
| Dimensions (Approx.) | 11.85" H x 10.63" W x 6.38" D (30.1H x 27W x 16.2D cm) |
| Operation Mode | Warm Mist |
| Filter Type | Filter-Free Design |
| Special Features | Medicine Cup, Dual Scent Pad Technology, Auto Shut-Off |

Image: A diagram showing the approximate dimensions of the Vicks VWM845 Humidifier: 11.85 inches in height, 10.63 inches in width, and 6.38 inches in depth.
Warranty and Support
This Vicks VWM845 Warm Mist Humidifier comes with a 3-year limited warranty from the date of purchase against defects in material or workmanship. For warranty service, please contact Vicks Consumer Relations. Do not attempt to repair the unit yourself.
Legal Disclaimer: Actual product packaging and materials may contain more and different information than what is presented in this manual. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product.
For further assistance or to inquire about replacement parts, please visit the official Vicks website or contact their customer support line. Refer to the product packaging for the most current contact information.





