Transform your indoor space into a warm and comfortable environment with the Mr. Heater Big Maxx Natural Gas Forced Air Heater. Designed to efficiently heat spaces up to 2,000 square feet, this powerful unit delivers 80,000 BTUs of heat output, making it an ideal solution for garages, workshops, or large indoor areas. Its high-temperature safety shut-off feature ensures peace of mind, while the durable, sleek black design seamlessly integrates into any setting.

Equipped with a powered exhaust system, the Big Maxx offers versatile venting options, supporting both vertical and horizontal installations (Category 1 and Category 3 venting). The spark ignition system with a self-diagnostic control module guarantees reliable performance and easy operation. Measuring 29.33” L x 15.50” W x 26.37” H, this heater requires a minimum of 8 feet of clearance from floor to base for safe installation.

Your purchase includes two angle brackets for secure mounting and a Liquid Propane conversion kit, giving you the flexibility to switch between fuel sources (thermostat, hose, and regulator sold separately). With its gas-powered forced air heating system, the Mr. Heater Big Maxx provides powerful and efficient heating for indoor use, ensuring maximum comfort during cold months.

Key Features:

• Heating Capacity: 80,000 BTUs, perfect for spaces up to 2,000 sq. ft.
• Power Source: Natural gas (convertible to propane).
• Installation Versatility: Horizontal and vertical venting options.
• Safety: High-temperature safety shut-off for added protection.
• Ease of Use: Spark ignition with self-diagnostic module.

Upgrade your heating game with the Mr. Heater Big Maxx—built for performance, safety, and convenience.

Specifications:

• Brand: Mr. Heater
• Model: Big Maxx
• Heating Capacity: 80,000 BTU
• Coverage Area: Up to 2,000 sq. ft.
• Dimensions: 29.33” L x 15.50” W x 26.37” H
• Weight: 88 lbs
• Product Dimensions (Overall): 22" D x 30" W x 27" H
• Power Source: Gas-powered (Natural Gas, convertible to Liquid Propane)
• Clearance Requirement: Minimum 8 ft. from floor to base of unit
• Voltage: 120V
• Amperage: 2.3 Amps
• Ignition System: Spark ignition with self-diagnostic control module
• Safety Feature: High-temperature safety shut-off
• Venting:
  • Category 1 Vertical
  • Category 3 Horizontal
• Installation: Includes two angle brackets for mounting
• Special Features: Powered exhaust for versatile venting options
• Color: Black
• Usage: Indoor use only
• Heating Method: Forced air

Included Accessories:

• 2 Angle Brackets
• Liquid Propane Conversion Kit

Not Included:

• Thermostat
• Hose
• Regulator

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From the manufacturer

 

Air louvers with 3 locking positions	Easy outside access to thermostat and A/C terminals	High powered fan	Powered exhaust allows for vertical or horizontal venting

 

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	Add to Cart	Add to Cart	Add to Cart
Customer Reviews	4.5 out of 5 stars 1,369	4.4 out of 5 stars 677	4.2 out of 5 stars 113
Price	$424.99$424.99	$529.99$529.99	$956.57$956.57
BTU	50,000	80,000	125,000
Heats up to	1,667 sq. ft.	2,667 sq. ft.	4,167 sq. ft.
Fuel type	Set for NG - Includes LP conversion kit	Set for NG - Includes LP conversion kit	Set for NG - Includes LP conversion kit
Includes brackets
WIFI/Digital thermostat compatible

 

 

Product Description

If you are looking to turn your garage or barn into a work space you can use all year-round, you will have to find a safe quiet and reliable heat source. This 80,000 BTU Natural Gas Unit heater is the way to go. It uses a built-in electric high velocity fan to pull cool air into the rear of the heater, across a heat exchanger, then forcing warm air into the surrounding areas. These heaters only require 115v AC power and can be vented vertically or horizontally - please check local codes and restrictions. With a mounting clearance of only 1 inch, the supplied brackets, external access to power, and thermostat connections - installation is a cinch. With the Durable Spark ignition and robust factory standard self diagnostic control module, we can offer a 3 year factory warranty on all parts and burners and a 10 year warranty on any defects in the heat exchanger. This heater offers the operating versatility and safety that you have come to expect from Mr. Heater.