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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
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
(Not Yet Rated - New)
Item# 16272
Factory Shipped —
Estimated Delivery: 14 - 16 Business Days
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Hide Similarities
Product Type Hardware/accessory Radiant heat Forced air Forced air Radiant heat
Vent-Free - No No No No
BTU Output
- 52,000 80,000 125,000 35,000
Heating Capability (sq. ft.) - 500–1,500 2000 3,125 500–2,000
Blower Included - No Yes Yes No
Blower (CFM) - - - 1,475 -
Blower Power Supply (Volts, Amps) - - 110 120, 6.4 -
Heat Settings Adjustable Thermostatically controlled Single 1 -
Fuel Type - Natural gas Natural gas Natural gas Natural gas
Fuel Consumption (gal./hr.) - 0.6 - 0.125 MCF 0.3
Gas Inlet (in.) - 1/2 3/4 in. MPT 1/2 1/2
Igniter - Standing millivolt pilot Electronic Spark Direct spark
Thermostat Included Yes No No No No
Remote Included - No No No No
Oxygen Depletion Sensor - - No No -
Dimensions L x W x H (in.) - - - 26 9/10 x 27 1/5 x 25 1/2 -
Dimensions W x D x H (in.) - 40 x 22 x 12 25 1/2 x 18 7/8 x 17 1/8 - 110 x 18 x 10
Product Weight (lbs.) - - - 89.1 -