1. Introduction
This manual provides essential instructions for the safe and efficient operation, setup, maintenance, and troubleshooting of your Mr. Heater 140,000 BTU Forced Air Kerosene Heater. This unit is designed to provide powerful heating for areas up to 3,500 square feet, making it suitable for garages and job sites. It features a robust design with dual powder-coated tubular steel handles, flat-free tires, and a split upper shell for simplified maintenance. Equipped with high output motors and user-friendly controls, this heater includes a factory-installed thermostat, high-limit safety switch, and a photo CAD cell for safe operation.

The Mr. Heater 140,000 BTU Forced Air Kerosene Heater, featuring a robust design with wheels for portability.
2. Important Safety Information
WARNING: Read and understand all instructions in this manual before attempting to assemble, operate, or service this heater. Improper use of this heater can cause serious injury or death.
- This heater is designed for outdoor use or in well-ventilated areas such as garages. Ensure adequate ventilation to prevent carbon monoxide buildup.
- Always use the specified fuel type (kerosene or diesel). Using incorrect fuels can be dangerous and damage the unit.
- Keep combustible materials at a safe distance from the heater.
- Do not operate the heater if any parts are damaged or missing.
- Ensure the heater is placed on a stable, level surface.
- The unit is equipped with a high-limit safety switch and a photo CAD cell to shut off in unsafe conditions. Do not bypass or modify these safety features.
3. Setup Instructions
3.1 Unpacking and Assembly
Carefully remove all components from the packaging. While this unit is designed for easy assembly, ensure all parts are present and undamaged before proceeding. Attach the handles and wheels as per the included assembly diagram (refer to the separate assembly guide for detailed steps).

One of the durable, flat-free tires designed for easy maneuverability and no maintenance.
3.2 Fueling the Heater
The heater is multi-fuel capable, designed to operate with kerosene or diesel. It features an 8-gallon tank for extended operation.
- Ensure the heater is turned off and cooled down before fueling.
- Locate the fuel cap on the top of the tank.
- Unscrew the fuel cap and carefully pour the appropriate fuel into the tank. Do not overfill.
- Securely replace the fuel cap.

The fuel cap for the 8-gallon tank, designed for easy filling of kerosene or diesel fuel.
3.3 Power Connection
Connect the heater's power cord to a grounded electrical outlet. Ensure the outlet meets the electrical requirements specified in the heater's manual.
4. Operating Instructions
4.1 Starting the Heater
- Ensure the fuel tank is adequately filled and the power cord is securely plugged in.
- Locate the ON/OFF power switch on the control panel.
- Flip the power switch to the ON position. The indicator light should illuminate.
- Rotate the thermostat control knob to your desired temperature setting. The heater will ignite and begin producing heat.

A hand activating the power switch to initiate heater operation.

A user's hand adjusting the control knob to set the desired temperature for the heater.
4.2 Adjusting Temperature
The heater is thermostatically controlled. To adjust the heat output, simply rotate the control knob to a higher or lower setting. The heater will automatically cycle on and off to maintain the set temperature.
4.3 Shutting Down the Heater
To turn off the heater, simply flip the ON/OFF power switch to the OFF position. Allow the unit to cool down completely before moving or storing.
5. Maintenance
Regular maintenance ensures optimal performance and longevity of your heater. The split upper shell design facilitates easier access for servicing.
- General Cleaning: Keep the exterior of the heater clean and free from dust and debris. Use a soft, dry cloth.
- Fuel Filter: Periodically inspect and clean or replace the fuel filter to ensure proper fuel flow. Refer to the detailed service manual for specific instructions.
- Ignition System: Check the igniter and electrodes for wear or carbon buildup. Clean or replace as necessary.
- Fan Blades: Ensure the fan blades are clean and free from obstructions for efficient airflow.
- Tires: The heater is equipped with flat-free tires, requiring no air pressure maintenance. Periodically check for damage.
6. Troubleshooting
If your heater is not operating correctly, consult the following common issues before seeking professional service.
| Problem | Possible Cause | Solution |
|---|---|---|
| Heater does not start or ignite. | No power, no fuel, clogged fuel filter, faulty igniter. | Check power connection, ensure fuel tank is full, clean/replace fuel filter, inspect igniter. |
| Heater produces smoke or unusual odor. | Incorrect fuel, improper pressure setting, dirty components. | Ensure correct fuel type, verify pressure settings (refer to service manual), clean burner components. |
| Heater shuts off unexpectedly. | Overheat safety engaged, low fuel, photo CAD cell issue. | Allow heater to cool, refill fuel, clean photo CAD cell. |
| Missing parts upon arrival. | Packaging error. | Contact Mr. Heater customer support immediately for replacement parts. |
7. Specifications
- Model Number: F210545
- Heat Output: 140,000 British Thermal Units (BTU)
- Heating Coverage: Up to 3,500 Sq Ft
- Fuel Type: Kerosene, Diesel (Multi-fuel)
- Tank Capacity: 8 Gallons (Easy-fill)
- Operation Time: Up to 8 hours on a full tank
- Controls: Thermostatically controlled, large glove-friendly controls
- Safety Features: High-limit safety switch, Photo CAD cell
- Portability: Dual powder-coated tubular steel handles, Flat-free tires
- Dimensions (Product): 17.2"D x 39.37"W x 18.11"H
- Item Weight: 53.9 pounds
- Indoor/Outdoor Usage: Outdoor (Recommended for well-ventilated areas like garages)
- Manufacturer: Mr. Heater
- UPC: 089301400566
8. Warranty and Support
For detailed warranty information, product registration, or technical support, please refer to the official Mr. Heater website or contact their customer service department. Keep your purchase receipt and model number (F210545) handy for all inquiries.
Mr. Heater Customer Service: Refer to the contact information provided in your product packaging or on the official Mr. Heater website.





