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Mr. Heater Big Maxx™ Natural Gas Garage/Workshop Unit Heater — 80,000 BTU, Model# MHU80NG

Item# 27465
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Mr. Heater Big Maxx™ Natural Gas Garage/Workshop Unit Heater — 80,000 BTU, Model# MHU80NG

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Was $569.99
Sale $407.99

Save $162.00

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  • Power exhaust allows for vertical or horizontal venting
  • Designed for right or left side piping, electrical and flue connections by simply rotating 180°
  • Tubular heat exchanger and spark ignition
  • 6 Amp draw
  • Venting kit required (sold separately — Item# 28795 vertical mount; Item#s 29794 horizontal mount)
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Complete Line of Big Maxx Garage Workshop Heaters

Complete Line of Big Maxx Garage Workshop Heaters

Models Ranging From 50,000 to 80,000 BTU - Natural + Propane Gas

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Product Summary

This Mr. Heater Big Maxx™ Natural Gas Garage/Workshop Unit Heater is quiet and vented for easily heating a 2- to 3-car garage. The low-profile design requires only 1in. clearance from the ceiling (two angle brackets are included). Big Maxx features power exhaust for vertical or horizontal venting. Use right or left side piping, electrical and flue connections by simply rotating 180°. Big Maxx includes an aluminum tubular heat exchanger for maximum efficiency and longer life. Handy extras include spark ignition with a self-diagnostic control module and easy outside access to the thermostat and AC terminals.

What's Included
  • (1) Garage/workshop heater
  • (1) LP conversion kit

Features + Benefits

Features for Mr. Heater Big Maxx™ Natural Gas Garage/Workshop Unit Heater — 80,000 BTU, Model# MHU80NG
  • Power exhaust allows for vertical or horizontal venting
  • Designed for right or left side piping, electrical and flue connections by simply rotating 180°
  • Tubular heat exchanger and spark ignition
  • 6 Amp draw
  • Venting kit required (sold separately — Item# 28795 vertical mount; Item#s 29794 horizontal mount)
  • Thermostat sold separately — Item# 173641
  •  Includes LP conversion kit Note: Due to BTU loss through exhaust gases, heater runs at approx. 81% operating efficiency. Check local codes and ordinances for approved installation and usage.
Key Specs
Item# 27465
Brand Mr. Heater
Manufacturer's Warranty 3 year limited warranty
Ship Weight 90.0 lbs
Product Type Forced air
BTU Output 80,000
Heating Capability (sq. ft.) 2,000
Vent-Free No
Blower Included Yes
Blower Power Supply (Volts, Amps) 110
Heat Settings Single
Fuel Type Natural gas
Gas Inlet (in.) 3/4 in. MPT
Igniter Electronic
Thermostat Included No
Remote Included No
Oxygen Depletion Sensor No
Dimensions W x D x H (in.) 25 1/2 x 18 7/8 x 17 1/8

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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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Mr. Heater Big Maxx™ Natural Gas Garage/Workshop Unit Heater — 80,000 BTU, Model# MHU80NG The price is $407.99.
Mr. Heater Big Maxx™ Natural Gas Garage/Workshop Unit Heater — 80,000 BTU, Model# MHU80NG
4.4 / 5 (81)
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Hide Similarities
Product Type Radiant heat Radiant heat Forced air Forced air Forced air
BTU Output
25,000 40,000 80,000 50,000 125,000
Heating Capability (sq. ft.) - 1,000 2,000 1,250 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 - - Single Single 1
Fuel Type Natural gas Natural gas Natural gas Natural gas Natural gas
Fuel Consumption (gal./hr.) - - - Varies 0.125 MCF
Gas Inlet (in.) - - 3/4 in. MPT 3/4 in. MPT 1/2
Igniter - Pilot light Electronic Electronic Spark
Thermostat Included Yes Yes No No No
Remote Included No No No No No
Oxygen Depletion Sensor No - 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 25 1/2 x 18 1/2 x 12 1/2 -
Product Weight (lbs.) - - - - 89.1