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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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Was $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
Vent-Free No
BTU Output 125,000
Heating Capability (sq. ft.) 3,125
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

Customer Reviews

Product Question + Answer
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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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Big Maxx Natural Gas Garage/Workshop Unit Heater — 125,000 BTU, Model# MHU125NG The price is $699.99.
Big Maxx Natural Gas Garage/Workshop Unit Heater — 125,000 BTU, Model# MHU125NG
(Not Yet Rated - New)
Item# 57328
In Stock Online
Was $799.99
Sale $699.99
Save $100.00
Hide Similarities
Product Type Radiant heat Radiant heat Forced air Forced air Forced air
Vent-Free No No No No No
BTU Output
40,000 40,000 50,000 80,000 125,000
Heating Capability (sq. ft.) 500–15,000 1,000 1,250 2000 3,125
Blower Included No No Yes Yes Yes
Blower (CFM)
- - - - 1,475
Blower Power Supply (Volts, Amps) - - - 110 120, 6.4
Heat Settings Thermostatically controlled - Single Single 1
Fuel Type Natural gas Natural gas Natural gas Natural gas Natural gas
Fuel Consumption (gal./hr.) 0.3 - Varies - 0.125 MCF
Gas Inlet (in.) 1/2 - 3/4 in. MPT 3/4 in. MPT 1/2
Igniter Direct spark Pilot light Electronic Electronic Spark
Thermostat Included No Yes No No No
Remote Included No No No No No
Oxygen Depletion Sensor - - No No No
Dimensions L x W x H (in.)
- 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.) 23 x 31 x 11 - 25 1/2 x 18 1/2 x 12 1/2 25 1/2 x 18 7/8 x 17 1/8 -
Product Weight (lbs.) - - - - 89.1