1. Introduction
Thank you for choosing the Comfyer Portable Milk/Water Warmer. This innovative device is designed to provide warm milk, formula, or water for your baby anytime, anywhere. Its portable and efficient design makes it an ideal companion for travel, outdoor activities, and convenient nighttime feedings. Please read this manual thoroughly before use to ensure safe and optimal operation.

2. Safety Information
- Do not immerse the main unit in water or other liquids.
- Ensure the charging port is dry before connecting the charging cable.
- Keep out of reach of children when in use, as the internal components can become hot.
- Use only the provided charging cable and adapter.
- Do not attempt to disassemble or repair the device yourself. Contact customer support for assistance.
- Avoid dry burning: Ensure there is liquid inside the warmer before activating the heating function. The device features an auto shut-off mechanism to prevent dry burning.
- The inner container is made of SUS 316 stainless steel, which is rust-resistant and food-safe, ensuring no odor or health risks associated with plastic.

3. Product Overview
The Comfyer Portable Milk/Water Warmer is designed for ease of use and portability. It features a sleek design with intuitive controls and a clear LED display.
Components:
- Main Unit (with LED display and control buttons)
- Flip-top Lid with handle
- USB-C Charging Port
- SUS 316 Stainless Steel Inner Container

Key Features:
- Wireless & Travel-Ready: Cord-free design for use anywhere.
- Fast Heating: Heats water to 104°F in 2 minutes, refrigerated breast milk to 98°F in 4-5 minutes.
- Long-Lasting Battery: 12000mAh battery, warms 5 oz of milk up to 9-10 times on a full charge, maintains temperature for 20 hours.
- Smart Temperature Control: 5 heating options (98°F, 104°F, 113°F, 122°F, 131°F).
- Scheduled Time Feeding: 6 preset timer modes (30, 60, 90, 120, 150, 180 minutes).
- Real-Time LED Display: Shows current temperature and battery levels.
- Leak-Proof Design: 360° rotation without leakage, safe for diaper bags.
4. Setup
Initial Charging:
Before first use, fully charge the warmer. Connect the provided USB-C cable to the charging port on the base of the unit and plug it into a compatible power source (wall adapter, car charger, or power bank). The LED display will indicate charging status. A full charge typically takes 2-3 hours.

First Use Preparation:
- Wash the inner stainless steel container and silicone parts thoroughly with warm soapy water. Rinse well and dry completely.
- Do not wash the main unit with water. Wipe it with a damp cloth if needed.
5. Operating Instructions
Filling the Warmer:
Open the flip-top lid. Pour the desired amount of breast milk, formula, or water into the stainless steel inner container. Ensure the liquid level does not exceed the maximum fill line.

Powering On/Off:
Press and hold the power button (usually the middle button) for a few seconds to turn the device on or off. The LED display will light up when powered on.
Setting Temperature:
Press the temperature setting button (usually the top button with a thermometer icon) to cycle through the 5 available temperature options: 98°F, 104°F, 113°F, 122°F, 131°F. Select the desired temperature for your liquid.

Using the Timer Function:
Press the timer button (usually the bottom button with a clock icon) to set a scheduled heating time. The available timer modes are 30, 60, 90, 120, 150, and 180 minutes. This feature allows you to preheat and insulate water or milk, saving time when you need it most.

Fast Heating Process:
Once the desired temperature and optional timer are set, the warmer will begin heating. The real-time LED display will show the current temperature as it rises. The device is designed for rapid heating, reaching 104°F for water in approximately 2 minutes and 98°F for refrigerated breast milk in 4-5 minutes.

On-the-Go Use:
The compact design and integrated handle make the warmer easy to carry in a travel bag or attach to a stroller. Its leak-proof design ensures safe transport.

6. Charging
The Comfyer Portable Milk/Water Warmer is equipped with a long-lasting 12000mAh battery, providing extended use on a single charge. It supports multiple charging methods for your convenience.
Charging Methods:
- USB Charging: Connect to a standard USB wall adapter.
- Car Charging: Use a car charger adapter for charging during commutes or road trips.
- Power Bank Charging: Connect to a portable power bank for charging on the go, especially useful during outdoor activities like camping.
A quick charge adapter is included, allowing the device to fully charge in 2-3 hours. A full charge can warm 5 oz of milk up to 9-10 times and maintain temperature for 20 hours.

7. Maintenance & Cleaning
Proper maintenance ensures the longevity and hygiene of your Comfyer Portable Milk/Water Warmer.
Cleaning Steps:
- Open the cover and remove the silicone ring: This allows for thorough cleaning of all accessible parts.
- Add water and detergent to brush it: Use a bottle brush with warm soapy water to clean the stainless steel inner container.
- Clean up the silicone parts: Wash the silicone ring and other removable silicone components with warm soapy water.
Rinse all cleaned parts thoroughly with clean water and allow them to air dry completely before reassembling or storing. Do not immerse the main unit (the base with buttons and display) in water. Wipe it clean with a damp cloth only.

8. Troubleshooting
If you encounter issues with your Comfyer Portable Milk/Water Warmer, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Low battery; not charged. | Fully charge the device for 2-3 hours using the provided adapter. |
| Device does not heat. | No liquid inside; E3 error (dry burning protection); incorrect temperature setting. | Ensure liquid is present. If E3 error, add liquid and restart. Check selected temperature. |
| Temperature display shows unusual numbers (e.g., '230'). | Software glitch or internal error. | Try resetting the device by turning it off and on. If persistent, contact customer support. |
| Beep sound not working. | Possible internal speaker issue. | This may not affect core functionality. If critical, contact customer support. |
| Liquid is not warm enough. | Insufficient heating time; too much liquid; very cold initial temperature. | Allow more time for heating. Ensure liquid volume is within recommended limits. |
If the problem persists after trying these solutions, please contact Comfyer customer support for further assistance.
9. Specifications
- Product Dimensions: 3.15 x 3.15 x 9.06 inches
- Item Weight: 1.72 pounds
- Battery: 3 Lithium Polymer batteries (included)
- Battery Capacity: 12000mAh
- Material Composition: PP (Polypropylene), SUS 316 Stainless Steel
- Country/Region of Origin: China
10. Warranty & Support
Comfyer products are designed for quality and reliability. For any warranty claims, technical support, or product inquiries, please refer to the contact information provided with your purchase or visit the official Comfyer website. Keep your purchase receipt as proof of purchase for warranty services.
11. Official Product Videos
Watch these official videos from Comfyer Direct for demonstrations and usage tips:
BW01 Daily Use Video
This video demonstrates the daily usage of the Comfyer BW01 portable milk warmer, showcasing its convenience and ease of operation in various settings.
Baby Bottle Warmer Overview
An official overview of the Comfyer baby bottle warmer, highlighting its features and benefits for parents.

