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125,000 Big Maxx BTU Natural Gas Heater with Propane Conversion Kit (MHU125NG / F260590)

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SKU: F260590

This item is OUT OF STOCK


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 125,000 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.

  • 125,000 BTU per hour
  • For use with natural gas - Natural Gas to Liquid Propane conversion kit included
  • Heats up to 4,167 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
  • Heater accepts WiFi thermostats
  • Minimum 8 ft clearance from floor to base of heater required
  • 1/2in gas connection
  • Category 1 vertical, category 3 horizontal venting
  • Thermostat sold separately - recommended 24V


ModelMHU125 (F260590)
Heating Area (Sq Ft)4167
Weight108 lbs
UseResidential Garages, Metal Buildings, Warehouses, Agricultural Building, Storage Buildings
ThermostatSold Seperately
Fuel TypeNatural Gas or Propane
Heat TypeForced Air
High Limit Safety Shut-off (HLS)Yes
Indoor SafeNo

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