Mr․ Heater 50,000 BTU Manual: A Comprehensive Guide
Mr․ Heater provides a full product line, with the 50,000 BTU unit requiring careful installation and adherence to safety guidelines․
This manual, dated today 12/17/2025, details operation, maintenance, and troubleshooting for optimal performance and user safety․
Understanding the Mr․ Heater 50,000 BTU Unit
The Mr․ Heater MHU 50, boasting 50,000 BTU output, is a powerful, compact unit designed for temporary heating needs in various environments․ This heater, manufactured by Mr․ Heater, Inc․ at 4560 W․ 160th St․, Cleveland, Ohio 44135 (reachable at 800-251-0001), is commonly utilized for construction sites, garages, and workshops․
Understanding its capabilities requires acknowledging its fuel source – propane or natural gas – and the necessity for proper ventilation․ The unit’s operation hinges on a pilot light system, demanding careful attention to lighting and shut-down procedures․ The control panel allows for adjusting heat settings, influencing the BTU output to match the required warmth․
Crucially, this heater is not for indoor use without adequate ventilation, posing risks of carbon monoxide poisoning․ Always consult the National Fuel Gas Code (ANSI Z223․1) or CSA B149․1 for correct piping and installation․ A drip leg is essential in the fuel supply line․ Refer to the provided manual for detailed instructions and safety warnings, ensuring responsible operation․
Safety Precautions and Warnings
WARNING: Operating the Mr․ Heater 50,000 BTU unit presents significant hazards if safety precautions are ignored․ Improper installation, adjustment, or maintenance can lead to FIRE, BURN, INHALATION, and EXPLOSION․ Always read the instructions thoroughly before assembly or operation, and retain the manual for future reference․
Carbon Monoxide (CO) poisoning is a severe risk․ This heater must be used with adequate ventilation․ Never operate it in enclosed spaces․ Be aware of potential exposure to UNKNOWN CHEMICALS․ Ensure the area is free of flammable materials and keep children and pets away․

Electrical shock is another potential danger; avoid contact with wet surfaces while operating the heater․ The manufacturer, Mr․ Heater, Inc․, emphasizes the importance of adhering to local codes, potentially requiring a manual main shutoff․

Proposition 65 Warning (California): This product may contain chemicals known to the state of California to cause cancer or reproductive harm – see www․p65warnings․ca․gov for details․ Failure to heed these warnings can result in serious injury or death․
Initial Setup and Installation
Before initial use of your Mr․ Heater 50,000 BTU unit, carefully unpack all components and inspect for damage․ The installer must leave this manual with the appliance owner․ Ensure the heater is placed on a level, stable, and non-combustible surface, maintaining required clearances from surrounding objects as specified in the manual․
Installation requires adherence to the (American) National Fuel Gas Code ANSI Z223․1 or (Canada) CSA B149․1․ A qualified technician should verify proper gas supply connection and regulator sizing – the regulator is not supplied with the heater․
Crucially, install a drip leg in the vertical pipe run to the unit․ Some localities mandate a manual main shutoff valve; consult local codes for compliance․ Double-check all connections for leaks using a soap and water solution․
Prior to lighting, verify adequate ventilation to prevent carbon monoxide buildup․ Familiarize yourself with the control panel and all safety features before proceeding․ Proper setup is paramount for safe and efficient operation․
Fuel Source Requirements (Propane/Natural Gas)
The Mr․ Heater 50,000 BTU unit is designed for use with either propane or natural gas, but conversion kits may be required depending on the model and initial configuration․ Always verify the heater is configured for the correct fuel type before attempting operation․
For propane, a 20-lb propane tank with a POL connection is typically used․ Ensure the tank is approved for use with gas heaters and in good condition․ Natural gas requires a connection to a regulated gas supply line, adhering to ANSI Z223․1 or CSA B149․1 standards․
Proper piping size is critical; consult the National Fuel Gas Code for correct sizing based on BTU input and pipe length․ A drip leg must be installed in the vertical pipe run to trap debris and prevent regulator malfunction․
Using the incorrect fuel type or improper gas pressure can result in inefficient operation, safety hazards, and void the warranty․ Always prioritize safety and consult a qualified technician if unsure․
Connecting to a Fuel Supply
Connecting the Mr․ Heater 50,000 BTU unit to a fuel supply requires meticulous attention to detail and adherence to safety protocols․ For propane, securely attach a propane regulator and hose assembly approved for high BTU appliances to the tank’s POL valve․ Ensure a tight connection to prevent leaks – use a leak detection solution to verify․
When connecting to natural gas, a qualified technician should install a shut-off valve and appropriate piping, following local codes and ANSI Z223․1/CSA B149․1 guidelines․ A drip leg is essential to catch debris․
Never use damaged or worn hoses or fittings․ Regularly inspect connections for corrosion or damage․ The regulator is not supplied with the heater; proper sizing is crucial for optimal performance․
Before operation, always perform a leak test․ If a leak is detected, immediately shut off the gas supply and address the issue before attempting to light the heater․ Improper connections can lead to fire or explosion․
Ventilation Requirements & Carbon Monoxide Safety
Crucially, the Mr․ Heater 50,000 BTU unit must be used with adequate ventilation․ This heater consumes oxygen and produces carbon monoxide (CO), a deadly, odorless, and colorless gas․ Operating in enclosed spaces can quickly lead to CO poisoning, resulting in serious illness or death․
Ensure at least 4 square inches of free ventilation opening for every 1,000 BTU/hr of heater rating․ Provide fresh air entry near the floor and exhaust outlet high on the wall․ Never block ventilation pathways․
Install a CO detector with battery backup in the same room as the heater and ensure it’s functioning correctly․ Regularly test the detector․ Be aware of CO poisoning symptoms: headache, dizziness, nausea, shortness of breath, and confusion․
If a CO detector alarms, immediately shut off the heater, evacuate the area, and call emergency services․ Proper ventilation is paramount for safe operation․ Ignoring these warnings can be fatal․
Operating Instructions: Lighting and Shut-Down
Before lighting, ensure the heater is positioned on a level surface, connected to a proper fuel supply, and the area is well-ventilated․ Carefully read all instructions before proceeding․ Locate the gas control valve․ Turn the control knob to the “OFF” position․ Slowly open the propane tank valve․
To light, push and hold the control knob in, simultaneously pressing the igniter button․ Continue holding both until the pilot light ignites․ Release the control knob slowly․ If the pilot doesn’t light after several attempts, wait five minutes before trying again․
To shut down, turn the control knob to the “OFF” position․ Close the propane tank valve․ Always allow the heater to cool completely before moving or storing․ Never disconnect the fuel supply while the heater is operating․ Refer to the manual for detailed diagrams and safety precautions․
Adjusting Heat Settings and BTU Output
The Mr․ Heater 50,000 BTU unit offers variable heat settings, allowing you to adjust the BTU output to match your heating needs․ The control panel features a dial or switch to regulate the gas flow, directly impacting the heat generated․
To increase heat, slowly turn the control knob towards the “HIGH” setting․ This maximizes gas flow, delivering the full 50,000 BTU output․ For lower heat, turn the knob towards the “LOW” setting, reducing gas flow and BTU output․ Observe the room temperature and adjust accordingly․
Caution: Avoid rapid adjustments to the control knob․ Gradual changes ensure stable operation and prevent potential safety hazards․ Regularly check the flame pattern; a strong, blue flame indicates efficient combustion․ Refer to the manual for specific BTU ranges associated with each setting․ Proper adjustment optimizes fuel efficiency and comfort․
Understanding the Control Panel

The Mr․ Heater 50,000 BTU unit’s control panel is central to safe and efficient operation․ Typically, it features a main control knob for adjusting heat settings, ranging from “OFF” to “HIGH”․ This knob regulates gas flow, controlling the BTU output․ A pilot light indicator visually confirms the pilot flame is lit, essential for ignition․
Some models include an on/off switch for the electric blower, enhancing heat distribution․ Familiarize yourself with the location of any error code displays, which signal potential issues․ The panel may also house a pressure gauge, indicating fuel supply pressure․
Important: Never force the control knob․ Smooth, deliberate adjustments are crucial․ Regularly inspect the panel for damage or obstructions․ Refer to the manual’s diagram for specific component identification․ Understanding each control allows for precise operation and quick response to any alerts or warnings displayed․
Troubleshooting Common Issues
Several issues may arise with your Mr․ Heater 50,000 BTU unit․ A common problem is failure to ignite; ensure the gas supply is open and the pilot light is lit, following the “Operating Instructions”․ If the heater clicks but doesn’t ignite, check for a blocked pilot orifice․ Another frequent concern is inconsistent heating – verify proper ventilation and adequate fuel supply․
Error codes, displayed on the control panel, provide valuable diagnostic information․ Consult the “Understanding Error Codes” section of this manual for specific meanings․ A yellow flame indicates incomplete combustion; address ventilation immediately․ If you suspect a gas leak, immediately shut off the gas supply and contact a qualified technician․
Warning: Do not attempt repairs beyond your expertise․ Improper servicing can create hazards․ Always refer to the manual and prioritize safety․ Remember the Mr․ Heater contact details for professional assistance․ Ignoring issues can lead to malfunction or dangerous conditions․
Maintenance and Cleaning Procedures
Regular maintenance ensures the longevity and safe operation of your Mr․ Heater 50,000 BTU unit․ Before any maintenance, always disconnect the fuel supply․ Periodically inspect the burner for debris and obstructions, cleaning with a soft brush․ Check the gas regulator for damage or leaks – refer to “Gas Regulator Information & Replacement” for details․
The heater’s exterior can be cleaned with a damp cloth and mild detergent․ Avoid abrasive cleaners․ Inspect the ventilation openings for blockage, ensuring proper airflow․ A clogged vent can lead to carbon monoxide buildup․ Annually, have a qualified technician inspect the unit for potential issues․
Warning: Never attempt to modify or repair the gas regulator yourself․ Improper handling can be dangerous․ Keep the area around the heater clear of combustible materials․ Following these procedures will help maintain optimal performance and safety, as outlined in the instructions manual․
Pilot Light Troubleshooting
A stable pilot light is crucial for the Mr․ Heater 50,000 BTU unit’s operation․ If the pilot light won’t stay lit, first ensure the gas supply is fully open․ Check for drafts that might be extinguishing the flame․ A dirty pilot assembly can also be the culprit; carefully clean the pilot orifice with a fine wire or compressed air – always disconnect the gas first!

If cleaning doesn’t resolve the issue, inspect the thermocouple․ A faulty thermocouple won’t allow the gas valve to stay open․ Replacement may be necessary․ Ensure the pilot light is properly aligned with the thermocouple․ Refer to the unit’s diagram in the owner’s manual for correct positioning․
Warning: Repeated pilot light failures indicate a potential problem․ Do not continue attempting to light the heater if the issue persists․ Consult a qualified technician․ Improper troubleshooting can lead to gas leaks or other hazards․ Always follow the safety precautions detailed in the manual․

Gas Regulator Information & Replacement
The gas regulator on your Mr․ Heater 50,000 BTU unit is a vital component, maintaining consistent gas pressure for safe and efficient operation․ The manual emphasizes that the regulator is not supplied with the heater and must be sourced separately, adhering to ANSI Z223․1 or CSA B149․1 standards for correct sizing․ A drip leg is essential in the vertical pipe run to the unit․
If you suspect regulator malfunction – erratic flame, inconsistent heating, or gas odor – immediately shut off the gas supply․ Do not attempt to repair the regulator yourself․ Replacement should only be performed by a qualified gas appliance technician․
When replacing, ensure the new regulator is specifically designed for propane or natural gas, matching your fuel source․ Verify proper connection and leak test all fittings with a soap solution after installation․ Warning: Incorrect regulator installation can create a dangerous situation․ Always prioritize safety and professional assistance․
Understanding Error Codes
The Mr․ Heater 50,000 BTU unit utilizes error codes to diagnose operational issues, displayed on the control panel․ While specific codes aren’t detailed in the provided excerpts, understanding their significance is crucial for effective troubleshooting․ These codes indicate problems with ignition, gas supply, overheating, or sensor malfunctions․
If an error code appears, immediately consult the complete owner’s manual for a comprehensive list and corresponding solutions․ Do not attempt to operate the heater while an error code is present․ Ignoring error codes can lead to unsafe operating conditions or permanent damage․
Common troubleshooting steps include verifying the fuel supply, checking the vent for obstructions, and ensuring proper electrical connection․ If the error persists after attempting basic solutions, contact a qualified technician․ Warning: Attempting repairs without proper knowledge can be hazardous․ Prioritize safety and professional assistance when dealing with error codes․

Storage and Off-Season Care
Proper storage is vital for maintaining the longevity of your Mr․ Heater 50,000 BTU unit․ Before storing, disconnect the fuel supply – propane or natural gas – and ensure the heater is completely cool․ Clean the unit thoroughly, removing any dust, debris, or potential contaminants․ Refer to the ‘Maintenance and Cleaning Procedures’ section for detailed instructions․
Store the heater in a dry, well-ventilated location, protected from extreme temperatures and direct sunlight․ Cover the unit to prevent dust accumulation․ It’s recommended to store the heater with the owner’s manual readily accessible for future reference․
Periodically inspect the gas hose and connections for cracks or damage during off-season storage․ Replace any damaged components before the next heating season․ Following these steps ensures your Mr․ Heater is ready for reliable operation when needed, maximizing its lifespan and performance․
Warranty Information and Contact Details
Mr․ Heater, Inc․ stands behind its 50,000 BTU unit with a limited warranty against defects in materials and workmanship․ The warranty period begins on the date of original purchase and varies depending on the specific model and components․ Please retain your proof of purchase for warranty claims․
To initiate a warranty claim, contact Mr․ Heater, Inc․ directly․ Their contact information is as follows: 4560 W․ 160th St․, Cleveland, Ohio 44135․ You can also reach them by phone at 800-251-0001․ Their website, referenced in provided documentation, offers additional support and resources․
The warranty does not cover damage resulting from misuse, improper installation, lack of maintenance, or acts of nature․ Always adhere to the safety precautions and operating instructions outlined in this manual to maintain warranty validity․ For complete warranty details and terms, consult the separate warranty document included with your heater or visit the Mr․ Heater website․
Proposition 65 Warning (California)

WARNING: This Mr; Heater 50,000 BTU unit, and products utilizing similar combustion processes, contain chemicals known to the State of California to cause cancer and/or reproductive harm․ This warning is provided in accordance with California’s Proposition 65․

Specifically, combustion byproducts produced during the use of this heater may include carbon monoxide, a known reproductive toxicant․ Exposure to these substances can occur during normal operation if the unit is not properly ventilated or maintained․
For more information regarding Proposition 65 and a complete list of chemicals covered, please visit WWW․P65WARNINGS․CA․GOV․ Mr․ Heater, Inc․ emphasizes the importance of following all safety instructions outlined in this manual, including proper ventilation, to minimize potential exposure․

Always operate this heater in a well-ventilated area and ensure the exhaust fumes are directed safely away from occupied spaces․ Failure to do so could result in health risks․ Refer to the ventilation requirements section of this manual for detailed guidance․















































































