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Big Maxx Natural Gas Garage/Workshop Unit Heater — 125,000 BTU, Model# MHU125NG

Item# 57328
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Big Maxx Natural Gas Garage/Workshop Unit Heater — 125,000 BTU, Model# MHU125NG

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Reg. $799.99
Sale $699.99

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  • Requires only 1" clearance from ceiling with 2 included angle brackets
  • Power exhaust allows for vertical or horizontal venting
  • Designed for right or left side piping, electrical and flue connections by simply rotating 180°
  • Aluminum tubular heat exchanger for maximum efficiency and longer life
  • Spark ignition with self-diagnostic control module
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Product Summary

This Big Maxx™ Natural Gas Garage/Workshop Unit Heater is designed for residential and commercial use, easily heating a 2- to 3-car garage. Built-in electric high velocity fan pulls cool air into the rear of the heater and over a heat exchanger, forcing hot air into the surrounding area.

What's Included
  • (1) Garage/workshop unit heater

Features + Benefits

  • Requires only 1" clearance from ceiling with 2 included angle brackets
  • Power exhaust allows for vertical or horizontal venting
  • Designed for right or left side piping, electrical and flue connections by simply rotating 180°
  • Aluminum tubular heat exchanger for maximum efficiency and longer life
  • Spark ignition with self-diagnostic control module
  • Easy outside access to thermostat and AC terminals
  • Requires 115 Volt AC power
  • Includes LP conversion kit
  • 4" flue for both horizontal and vertical venting; venting kit required (not included)
  • Thermostat, Item# 173641, sold separately
Key Specs
Item# 57328
Brand Mr. Heater
Manufacturer's Warranty 3 year limited warranty
Ship Weight 122.0 lbs
Product Type Forced air
BTU Output 125,000
Heating Capability (sq. ft.) 3,125
Vent-Free No
Blower Included Yes
Blower (CFM) 1,475
Blower Power Supply (Volts, Amps) 120, 6.4
Heat Settings 1
Fuel Type Natural gas
Fuel Consumption (gal./hr.) 0.125 MCF
Gas Inlet (in.) 1/2
Igniter Spark
Thermostat Included No
Remote Included No
Oxygen Depletion Sensor No
Dimensions L x W x H (in.) 26 9/10 x 27 1/5 x 25 1/2
Product Weight (lbs.) 89.1

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Replacement Parts
Call To Order: 1-800-657-0516

Mon - Fri 7:00 AM - 6:00 PM (Central)
Sat 7:00 AM - 3:00 PM (Central)

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Item# 57328
Big Maxx Natural Gas Garage/Workshop Unit Heater — 125,000 BTU, Model# MHU125NG The price is $699.99.
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Hide Similarities
Category Type - - Infrared heat - -
Product Type Radiant heat Radiant heat - Forced air Forced air
BTU Output
25,000 40,000 80,000 80,000 125,000
Heating Capability (sq. ft.) - 1,000 1,000–3,000 2,000 3,125
Vent-Free No No - No No
Blower Included No No No Yes Yes
Heat Settings - - Thermostatically controlled Single 1
Blower (CFM)
- - - - 1,475
Blower Power Supply (Volts, Amps) - - - 110 120, 6.4
Fuel Type Natural gas Natural gas - Natural gas Natural gas
Fuel Consumption (gal./hr.) - - 1 - 0.125 MCF
Thermostat Included Yes Yes No No No
Gas Inlet (in.) - - 1/2 3/4 in. MPT 1/2
Igniter - Pilot light Direct spark Electronic Spark
Remote Included No No No No No
Oxygen Depletion Sensor No - - No No
Dimensions L x W x H (in.)
29 3/4 x 12 1/4 x 7 35.5 x 12.5 x 21 - - 26 9/10 x 27 1/5 x 25 1/2
Dimensions W x D x H (in.) - - - 25 1/2 x 18 7/8 x 17 1/8 -
Product Weight (lbs.) - - - - 89.1