Mr. Heater Big Buddy Manual: A Comprehensive Guide
This manual provides detailed instructions for the Mr. Heater Big Buddy, a portable propane heater. It covers safety, operation, maintenance, and troubleshooting for optimal performance.
Understanding the Big Buddy Heater
The Mr. Heater Big Buddy is a popular choice for supplemental heating in various environments, offering a clean-burning propane solution. It’s designed for portability, making it suitable for workshops, garages, camping, and emergency situations. This heater provides significant heat output, but requires careful attention to safety protocols. Understanding its features, like the low oxygen depletion sensor and tip-over shut-off, is crucial.
The Big Buddy isn’t without its complexities; proper ventilation is paramount. It’s a powerful tool when used responsibly, delivering a substantial amount of heat for its size.
Safety Precautions
Prioritizing safety is paramount when operating the Mr. Heater Big Buddy. Always ensure adequate ventilation to prevent carbon monoxide buildup, a potentially fatal hazard. Never use the heater in enclosed spaces or where combustible materials are present. Regularly inspect the propane tank and connections for leaks before each use. Maintain a safe distance from the heater during operation, and never leave it unattended.
Familiarize yourself with the heater’s safety features, including the ODS and tip-over switch, and heed all warning labels. Responsible use guarantees a safe heating experience.

Carbon Monoxide (CO) Awareness
Carbon monoxide (CO) is a colorless, odorless, and deadly gas produced by incomplete combustion. The Mr. Heater Big Buddy, while equipped with an Oxygen Depletion Sensor (ODS), requires vigilant CO awareness. Ensure proper ventilation by keeping doors and windows slightly open during operation. Never use the heater in a sealed room or dwelling.
Install a CO detector near the heater and regularly test its functionality. Recognize the symptoms of CO poisoning – headache, dizziness, nausea – and seek fresh air immediately if experienced. Prioritize safety and prevent CO exposure.
Proper Ventilation Requirements
Adequate ventilation is crucial when operating the Mr. Heater Big Buddy to prevent oxygen depletion and carbon monoxide buildup. A minimum of 7 cubic feet of air per 1,000 BTU/hour is required. Ensure at least a 4-inch opening exists for fresh air intake. Avoid using the heater in confined spaces like tents or RVs without sufficient ventilation.
Cracked windows or doors provide necessary airflow. Regularly check for proper ventilation, especially during extended use. Never obstruct ventilation openings. Prioritizing airflow ensures safe and efficient heater operation.
Components and Features
The Mr. Heater Big Buddy boasts several key components for reliable performance. These include a robust heater body constructed for portability and durability, and a user-friendly control panel for adjusting heat settings. A secure propane tank connection ensures a consistent fuel supply. Notable features include high and low heat settings, plus a convenient quick-connect hose.
The heater’s radiant surfaces efficiently distribute warmth, while safety features like the ODS and tip-over switch enhance user protection. Its clean-burning operation minimizes odors.
Heater Body and Construction

The Mr. Heater Big Buddy’s heater body is designed for rugged use and easy portability. Constructed from high-impact polymers and steel, it withstands demanding conditions; The unit features a protective cage around the burner assembly, preventing accidental contact. Its compact size allows for convenient storage and transport.
The body’s design facilitates efficient radiant heat distribution. Durable handles provide a secure grip during movement; The overall construction prioritizes safety and longevity, ensuring reliable performance in various environments.
Control Panel Overview
The Big Buddy’s control panel is intuitively designed for simple operation. It features a three-position control knob: Off, Low, and High, allowing for adjustable heat output. A pilot light indicator clearly shows when the pilot is lit. The panel also includes a push-button ignition for easy and reliable starting.
Crucially, the control panel houses the ODS (Oxygen Depletion Sensor) reset button. This is vital for safety, and users should familiarize themselves with its location. The panel’s layout ensures quick access to essential controls, even in low-light conditions.
Propane Tank Connection
Connecting the propane tank is a straightforward process, but requires careful attention to safety. The Big Buddy utilizes a standard POL connection, accepting common 20lb propane tanks. Ensure the tank valve is completely closed before attaching the regulator. Hand-tighten the connection firmly, then use a wrench for an additional quarter turn.
Always inspect the hose for damage before each use. Never use a damaged hose! The regulator is designed to reduce high tank pressure to a safe operating level. Proper connection is crucial for efficient and safe heater operation. Do not attempt to modify the connection.

Setting Up the Big Buddy
Proper setup is essential for safe and efficient operation of your Mr. Heater Big Buddy. Begin by selecting a level, non-combustible surface, ensuring ample ventilation. Carefully connect the propane tank, verifying a secure connection as detailed in the previous section. Before initial startup, inspect all components for damage.
Position the heater away from flammable materials and ensure the area is clear. Familiarize yourself with the control panel and its functions. Always perform a leak test after connecting the propane tank, using a soapy water solution. This confirms a gas-tight seal.

Connecting the Propane Tank
To connect the propane tank, ensure the heater is OFF and cool. Locate the propane tank connection port on the heater and the POL valve on the tank. Slowly thread the POL valve into the connection port, hand-tightening until secure. Do NOT use tools to tighten, as this can damage the valve or port.
After connecting, perform a leak test. Mix soapy water and apply it to the connection. If bubbles appear, there’s a leak; disconnect and re-tighten. Only use approved propane tanks and hoses, and always follow safety guidelines.

Initial Startup Procedure

Before the first use, inspect the heater for any damage. Ensure proper ventilation is available and the area is clear of flammable materials. Slowly open the propane tank valve, following the tank manufacturer’s instructions. Then, turn the heater control knob to the “Pilot” position and press and hold the pilot button.
Continue holding the pilot button until the pilot light ignites; Once lit, release the button. If the pilot doesn’t light, repeat the process. Always monitor the heater during startup and ensure stable operation before adjusting heat settings.
Adjusting Heat Settings
The Big Buddy offers multiple heat settings for customized comfort. After successful pilot ignition, rotate the control knob clockwise to select the desired heat output – Low, Medium, or High. Observe the heater’s performance at each setting to determine the optimal level for your needs.
Be mindful of room size and ventilation when adjusting heat. Higher settings require increased airflow. Avoid prolonged use at the highest setting in smaller, well-insulated spaces. Regularly check the heater’s operation and ensure the ODS is functioning correctly during adjustments.
Operating Instructions
Before operation, ensure proper ventilation and a full propane tank connection. To ignite, turn the control knob to the “Pilot” position and press firmly. Continue pressing until a steady pilot flame is established. Then, turn the knob to the desired heat setting – Low, Medium, or High.

Monitor the heater’s operation closely, checking for a strong, blue flame and proper ODS function. Never leave the heater unattended while in use. To shut down, turn the control knob to “Off” and disconnect the propane tank when not in use.
Lighting the Heater
Prior to lighting, confirm the heater is positioned on a level surface with adequate ventilation. Turn the control knob to the “Pilot” position and press down firmly. Simultaneously, press the igniter button repeatedly until a consistent pilot flame appears. Continue holding the knob down for approximately 30 seconds after ignition to allow the thermocouple to heat up.
If the pilot fails to light after several attempts, wait five minutes before trying again to allow any accumulated gas to dissipate. Once the pilot is stable, release the knob and turn it to the desired heat setting.
Monitoring Heater Operation
Regularly visually inspect the burner flame; it should be blue with minimal yellow tipping. A consistently yellow flame indicates incomplete combustion and potential carbon monoxide production, requiring immediate attention and ventilation. Monitor the propane tank gauge to ensure sufficient fuel remains for continued operation; Listen for any unusual noises, such as hissing or popping, which could signify a gas leak or malfunction.
Periodically check the heater’s exterior for excessive heat and ensure proper airflow around the unit. Never leave the heater unattended during operation, and keep flammable materials well clear.
Turning Off the Heater
To safely turn off the Mr. Heater Big Buddy, first rotate the control knob to the “OFF” position. This shuts off the gas supply to the burner assembly. Ensure the pilot light is extinguished before disconnecting the propane tank. Allow the heater to cool completely before attempting to move or store it.
Always close the propane tank valve tightly to prevent any residual gas leakage. Double-check all connections for secure closure. Store the heater in a well-ventilated area, away from combustible materials.
Maintenance and Troubleshooting
Regular maintenance ensures optimal performance and safety of your Mr. Heater Big Buddy. Periodically inspect the burner assembly for obstructions and clean it with a soft brush. Check all gas connections for leaks using a soapy water solution – bubbles indicate a leak. Address any leaks immediately.
If the heater fails to ignite, ensure the propane tank is full and the connections are secure. For common issues, consult the troubleshooting section of this manual. Never attempt repairs beyond your expertise; contact a qualified technician.
Cleaning the Burner Assembly
To maintain efficient heating, regularly clean the burner assembly of your Mr. Heater Big Buddy. Begin by ensuring the heater is completely cool and the propane tank is disconnected. Carefully remove the burner assembly following the instructions in this manual. Use a soft brush or compressed air to gently remove any dust, debris, or obstructions from the burner ports and surrounding areas.
Avoid using water or harsh chemicals, as these can damage the components. Reinstall the burner assembly securely before operating the heater. A clean burner ensures proper combustion and optimal heat output.
Checking for Gas Leaks
Regularly inspect your Mr. Heater Big Buddy for gas leaks to ensure safe operation. Prepare a solution of soapy water – mix liquid dish soap with water. With the propane tank connected but the heater unlit, apply the soapy water to all gas connections, including the tank connection, regulator, and hose.
Watch for bubbles; their presence indicates a leak. If a leak is detected, immediately turn off the propane tank and tighten the connections. If the leak persists, do not use the heater and contact a qualified service technician.
Common Issues and Solutions
If your Mr. Heater Big Buddy fails to ignite, first ensure the propane tank is full and properly connected. Check the pilot light assembly for obstructions and clean if necessary. A yellow flame indicates incomplete combustion; adjust the air intake for a blue flame.
If the heater shuts off unexpectedly, the low oxygen depletion sensor (ODS) may have activated. Ensure adequate ventilation. For other issues, consult the full manual or contact Mr. Heater support. Never attempt to repair the heater yourself if you are not qualified.
Propane Tank Considerations

Selecting the correct propane tank is crucial for safe and efficient operation of your Mr. Heater Big Buddy. Use only tanks designed for propane and equipped with a POL valve connection. Ensure the tank is in good condition, free from dents or rust.
Always store propane tanks outdoors in a well-ventilated area, away from heat sources and direct sunlight. When refilling, never overfill the tank – leave space for expansion. Regularly inspect the tank and hose for leaks using a soapy water solution.
Choosing the Right Propane Tank
For your Mr. Heater Big Buddy, selecting a compatible propane tank is paramount for safe and reliable heating. Opt for tanks specifically designed for propane appliances, featuring a POL (Propane Outlet Line) valve connection. Tank size depends on your heating needs and duration of use; consider a 20lb tank for typical applications.
Ensure the tank is DOT (Department of Transportation) approved and regularly inspected for any signs of damage, corrosion, or leaks. Never use a damaged tank! Prioritize quality and safety when choosing your propane source.
Propane Tank Safety
Prioritizing propane tank safety is crucial when operating your Mr. Heater Big Buddy. Always store tanks outdoors in a well-ventilated area, away from heat sources and direct sunlight. Never store a propane tank indoors or in enclosed spaces. Securely fasten the tank to prevent tipping or rolling during use or transport.
Regularly inspect the tank, hose, and connections for leaks using a soapy water solution. If a leak is detected, immediately shut off the propane supply and address the issue. Follow all local and national regulations regarding propane storage and handling.
Refilling Propane Tanks
Properly refilling your propane tank ensures continued safe operation of the Mr. Heater Big Buddy. Always have tanks refilled by a qualified propane supplier, adhering to all safety regulations. Never overfill the tank, as this can create a dangerous situation. The tank should have an Overfill Protection Device (OPD) valve.
Before refilling, ensure the tank is completely empty and visually inspect it for damage. After refilling, check for leaks using a soapy water solution. Do not attempt to refill disposable propane cylinders; they are designed for single use.
Advanced Features
The Mr. Heater Big Buddy incorporates several advanced safety features for reliable operation. The Low Oxygen Depletion Sensor (ODS) automatically shuts off the heater if oxygen levels drop to unsafe levels, preventing carbon monoxide buildup. A crucial safety component, it monitors ambient air quality. Additionally, the Tip-Over Safety Switch instantly disables the heater if it’s accidentally knocked over, minimizing fire risk.
These features provide peace of mind, ensuring the heater operates safely within specified parameters. Regular inspection of these components is recommended for optimal performance and continued safety.
Low Oxygen Depletion Sensor (ODS)
The Big Buddy’s ODS is a critical safety feature, constantly monitoring surrounding oxygen levels. This sensor automatically shuts down the heater if oxygen decreases to an unsafe threshold – typically below 18%. This prevents the dangerous buildup of carbon monoxide, a colorless and odorless gas. Regularly verify the ODS pilot light is burning brightly; a weak or absent flame indicates a potential malfunction.
Never disable or tamper with the ODS. It’s designed to protect occupants from hazardous conditions. Proper ventilation remains essential, even with the ODS functioning.
Tip-Over Safety Switch
The Mr. Heater Big Buddy incorporates a crucial tip-over safety switch, designed to immediately halt operation if the unit is accidentally knocked over. This feature significantly reduces the risk of fire or burns by automatically shutting off the gas supply. Ensure the heater is placed on a stable, level surface to maximize the effectiveness of this safety mechanism.
Periodically test the switch by gently tilting the heater (while it’s off) to confirm it functions correctly. Do not rely solely on this switch; always exercise caution and supervise the heater when in use.
Warranty Information

Mr. Heater provides a warranty on the Big Buddy propane heater, covering defects in materials and workmanship for a specified period. The duration and specific terms of the warranty may vary, so it’s essential to retain your proof of purchase and carefully review the warranty documentation included with your heater.
The warranty typically excludes damage resulting from misuse, abuse, or lack of proper maintenance. To initiate a warranty claim, follow the outlined claim process, which usually involves contacting Mr. Heater customer support and providing necessary documentation.
Coverage Details
The Mr. Heater Big Buddy warranty generally covers defects in manufacturing and materials under normal use. This includes issues with the burner assembly, control panel, and heater body itself. Coverage typically begins from the original date of purchase. It’s crucial to register your product to ensure seamless warranty service.
The warranty does not cover normal wear and tear, accidental damage, or issues arising from improper fuel usage. Modifications or attempts to repair the unit by unauthorized personnel will void the warranty. Keep your receipt safe!
Claim Process
To initiate a warranty claim for your Mr. Heater Big Buddy, first gather your proof of purchase (receipt) and the product’s serial number. Contact Mr. Heater’s customer support via their website or phone number – details are available in the manual. You’ll likely need to describe the defect and potentially provide photos or videos.
Mr. Heater may request you to return the defective unit for inspection. If the claim is approved, they will either repair or replace the heater at their discretion. Shipping costs for the return may be your responsibility initially.
Frequently Asked Questions (FAQ)
Q: My Big Buddy won’t light. What should I do? A: Ensure the propane tank is full and properly connected. Check the igniter and clean the burner assembly. Q: What does the red light mean? A: A flashing red light often indicates a low oxygen condition or a fault with the ODS sensor – ensure adequate ventilation. Q: Can I use an extension hose? A: Mr. Heater recommends against using extension hoses as they can affect performance and safety.
Q: How often should I clean the heater? A: Regular cleaning, especially of the burner, is crucial for optimal operation.
Troubleshooting Common Problems
Problem: Heater clicks but doesn’t ignite. Solution: Verify propane tank pressure and check the igniter for debris. Problem: Yellow flame. Solution: Clean the burner assembly; a yellow flame indicates incomplete combustion. Problem: Heater shuts off during use. Solution: This could be the ODS sensor activating due to low oxygen – increase ventilation. Ensure the tip-over switch isn’t engaged.
Problem: Gas leak smell. Solution: Immediately shut off the heater and disconnect the propane tank; check connections for leaks.
Understanding Error Codes
The Mr. Heater Big Buddy utilizes a flashing LED to indicate error states. A rapid flash typically signals an issue with the Oxygen Depletion Sensor (ODS), indicating insufficient oxygen. A slow, continuous flash may point to a problem with the igniter or gas supply. Code 1 (one flash): Low battery in the igniter. Code 2 (two flashes): Faulty gas regulator.
Code 3 (three flashes): ODS sensor malfunction. If an error code appears, consult the full manual for detailed troubleshooting steps and safety precautions before attempting repairs.