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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 $689.99

Save $110.00

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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 $689.99.
Big Maxx Natural Gas Garage/Workshop Unit Heater — 125,000 BTU, Model# MHU125NG
4.7 / 5 (3)
Reg. $799.99
Sale $689.99
Save $110.00
Save $110.00
Product Type Radiant heat Infrared heat Forced air Forced air Forced air
BTU Output
40,000 100,000 50,000 80,000 125,000
Heating Capability (sq. ft.) 1,000 1,000–3,000 1,250 2,000 3,125
Vent-Free No No No No No
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.) - 1 Varies - 0.125 MCF
Gas Inlet (in.) - 1/2 3/4 in. MPT 3/4 in. MPT 1/2
Igniter Pilot light Direct spark Electronic Electronic Spark
Thermostat Included Yes No 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.) - 33 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