50,000 BTU Big Maxx Natural Gas Unit Heater

  • 50,000 BTU Big Maxx Natural Gas Unit Heater

50,000 BTU Big Maxx Natural Gas Unit Heater

Item #:F260420 Model #: MHU50NG
Mr. Heater Big Maxx Forced Air Natural Gas Unit Heater is efficient and effective convection heat for your garage or workshop for residential or commerical use.



If you are looking to turn your garage or barn into a work space you can use all year-round, you will have to find a safe quiet and reliable heat source. This 50,000 BTU Natural Gas Unit heater is the way to go. It uses a built-in electric high velocity fan to pull cool air into the rear of the heater, across a heat exchanger, then forcing warm air into the surrounding areas. These heaters only require 115v AC power and can be vented vertically or horizontally - please check local codes and restrictions. With a mounting clearance of only 1 inch, the supplied brackets, external access to power, and thermostat connections - installation is a cinch. With the Durable Spark ignition and robust factory standard self-diagnostic control module, we can offer a 3 year factory warranty on all parts and burners and a 10 year warranty on any defects in the heat exchanger. This heater offers the operating versatility and safety that you have come to expect from Mr. Heater.
  • 50,000 BTU per hour
  • For use with natural gas
  • Heats up to 700 sq. ft.
  • Spark ignition features self-diagnostic control module
  • Includes 2 angle brackets for ceiling mount
  • Low Profile Design - Can be installed in low-ceiling buildings
  • Minimum 8 ft clearance from floor to base of heater required
  • 1/2in gas connection
  • Category 1 vertical, category 3 horizontal venting

product details

Additional Information

BTU per Hour 50,000
Heating Area (Sq Ft) 1250
Tank Capacity (Min)
Run Time (Hrs at Max BTU)
Run Time (Hrs at Min BTU)
Fuel Consumption/Burn Rate (Gal/Hr)
Electricity Required No
Maximum Elevation (Ft)
Weight (Lbs) 70.00
Model MHU50NG
Oversized Yes
Length 29.33
Width 15.50
Disclaimer For elevations above 2,000 feet ratings should be reduced at the rate of 4% for each 1,000 feet above sea level or as specified by local authority having jurisdiction.
Use Residential Garages, Metal Buildings, Warehouses, Agricultural Building, Storage Buildings
Warranty 3 year Limited on parts and burner, 10 year limited on heat exchanger
Safety Tip-Over Switch No
Fuel Type Natural Gas
Heat Type Forced Air
Oxygen Depletion Sensor (ODS) No
High Limit Safety Shut-off (HLS) Yes
Indoor Safe No
Ignition Electronic
Hose & Regulator Included No

Parts and Manuals

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Customer Reviews

Good service
Review by Erik

I have two year old 50000 btu Big Maxx and have had 5 major problems with it, of course only in winter. Each time I spoke with the service tech support and we got the unit going. The last time we could not resolve the problem. I asked for a complete replacement of the furnace. Without any objection on the techs part he said that a new one would be sent. To my relief a new furnace was on my door step the next day. I had it installed immediately and after three months this one has been working great. This type of service is very much appreciated especially in the cold climate areas.

(Posted on 3/10/2018)

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