Mr. Heater MH4B Portable LP Heater Instruction Manual

Product Overview

The Mr. Heater Little Buddy Heater is a portable LP heater designed for outdoor enthusiasts, providing warmth in various settings such as campers, hunting blinds, and ice fishing shacks. It delivers 3,800 BTU per hour, capable of heating areas up to 95 square feet. This heater features user-friendly one-button ignition and a compact 8-inch round stand for minimal floor space. It incorporates reliable safety features including an Oxygen Depletion Sensor (ODS), accidental tip-over safety shut-off, and cross-thread protection.

Key Features

• 3,800 BTU per hour output
• Designed for use with propane gas
• Heats up to 95 sq ft
• One-button ignition for easy startup
• Compact 8-inch round stand for stability
• Accidental tip-over safety shut-off
• Automatic low oxygen shut-off system (ODS)
• Connects directly to one 1lb propane cylinder
• Quiet, clean, and odor-free operation
• Unauthorized accessories/attachments are prohibited and will void the warranty.

Image: The Mr. Heater MH4B Portable LP Heater in action, providing warmth to a user's hands in an outdoor setting.

Important Safety Information

READ AND FOLLOW ALL INSTRUCTIONS AND WARNINGS BEFORE USE.

• WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
• WARNING: Combustion by-products produced when using this product contain carbon monoxide, a chemical known to the State of California to cause cancer and birth defects (or other reproductive harm).
• WARNING: Never leave the heater unattended while burning.
• WARNING: Not for use in a "dwelling home" in California.
• WARNING: Every time a tank is connected to the unit, the connection must be checked for leaks in one or more ways. Apply soapy water to the connection, look for bubbles. Listen for the hiss of escaping gas, feel for extreme cold, smell for rotten egg odor. Do not use if leaking!
• WARNING: Any changes to this heater or its controls can be dangerous.
• WARNING: Early signs of carbon monoxide poisoning resemble the flu, with headache, dizziness, and/or nausea. If you have these signs, the heater may not be working properly. Get fresh air at once! Have heater serviced.
• WARNING: If the recreational or commercial enclosure does not have a window or roof vent, DO NOT USE THIS HEATER INSIDE.

Follow all safety instructions on the product and in the Operator's Manual. You should completely read and understand the Operator's Manual for your product before performing any service or maintenance.

Setup Instructions

1. Unboxing and Inspection: Carefully remove the heater from its packaging. Inspect the unit for any shipping damage. Ensure all components listed in the owner's manual are present.
2. Connecting Propane Cylinder:
   • Ensure the heater is cool to the touch and away from any flames or ignition sources.
   • Connect the heater to a 1lb propane cylinder. The tank should be installed in an upright position.
   • Ensure the tank threads are properly aligned with the heater threads to avoid damage.
   • Insert the tank into the tank base for stability, ensuring it is pushed all the way down.
3. Checking for Leaks: Using soapy water, check for leaks at the tank connection. Look for bubbles, listen for hissing gas, or smell for rotten egg odor. Do not use if leaking.
4. Clearance Requirements: Before starting the heater, ensure adequate clearance to combustible objects:
   • Top: 30 inches
   • Front: 24 inches
   • Sides: 6 inches
   • Rear: 0 inches

Image: The Mr. Heater MH4B Portable LP Heater providing warmth in an outdoor setting, demonstrating its portability and effectiveness.

Operating Instructions

1. Ignition: Press the start button. Check to see that the pilot light comes on. Continue to hold the start button down for 30 seconds to allow the pilot to prime. Then release the button. Ensure the pilot light stays on. If necessary, repeat this process until the pilot stays on.
2. Tip-Over Safety Test: The tip switch is an important safety device that shuts down the heater if it is knocked over or tilts past approximately 45 degrees. Once the tile has turned bright orange, tip the unit to test the tip switch safety device for proper shutdown of the heater.
3. Oxygen Depletion System (ODS): All infrared heaters, including the Mr. Heater Little Buddy, consume oxygen in the process of burning and must be properly vented. The Little Buddy is also equipped with a life-saving Oxygen Depletion System (ODS). The ODS senses the level of oxygen around the heater and shuts the heater down automatically if the oxygen percentage falls below a factory preset level.
4. Shutting Off the Unit: To shut off the unit, push the OFF button.

Image: A visual representation of the advanced safety detection systems (ASD Systems) including Emergency Low Oxygen Safety System (ELO2), Apex 50° Tip-Switch (ASO), and Thermal Shut-Down System (TSS).

Care and Maintenance

For detailed care and maintenance instructions, please refer to the comprehensive Operator's Manual provided with your Mr. Heater MH4B Portable LP Heater. Regular cleaning and proper storage will ensure the longevity and safe operation of your unit.

Specific care instructions include: See Product Manual.

For more information on refilling, visit www.fuelkeg.com.

Image: The Mr. Heater Fuel Keg logo, highlighting the refillable propane tank system.

Troubleshooting

If you encounter any issues with your Mr. Heater MH4B Portable LP Heater, please refer to the troubleshooting section in your Operator's Manual. This section provides solutions for common problems such as ignition failures, pilot light issues, and other operational concerns. If the problem persists, contact customer support.

Technical Specifications

Image: The Mr. Heater MH4B Portable LP Heater with key dimensions (height, width, depth) clearly indicated.

Warranty Information

The Mr. Heater MH4B Portable LP Heater comes with a 3-year limited warranty. For full details regarding warranty coverage, terms, and conditions, please refer to the warranty section in your Operator's Manual or contact Mr. Heater customer support.

Customer Support

For any questions, technical assistance, or service inquiries regarding your Mr. Heater MH4B Portable LP Heater, please contact Mr. Heater Technical Service at 800-251-0000 x 3511. Always have your model number and purchase information ready when contacting support.