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Mr. Heater

Mr. Heater F260560 Big Maxx MHU80NG Natural Gas Unit Heater, 80,000 BTU, Black

  • Based on 794 reviews
Condition: New
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Availability: Only 1 left in stock, order soon!
Fulfilled by Hearthshire
Arrives Thursday, Mar 12
Order within 4 hours and 8 minutes
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Features

  • Ceiling mounted forced air propane unit heater turns garages, barns and workshops into heated work spaces
  • 80,000 BTUs heat up to 2,667 sq ft, or approximately a 3- or 4-car garage
  • Compatible with standard 24-volt or new WI-F enabled thermostats (sold separately)
  • Low profile design minimum 10 ft ceiling height and 8 ft clearance required from base of heater to floor
  • High temperature safety shut-off switch and gas safety shut-off flame sensor

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.

Brand: Mr. Heater


Special Feature: Electronic Thermostat


Color: Black


Form Factor: Unit Heater


Indoor/Outdoor Usage: Indoor


Brand: Mr. Heater


Special Feature: Electronic Thermostat


Color: Black


Form Factor: Unit Heater


Indoor/Outdoor Usage: Indoor


Product Dimensions: 22"D x 30"W x 27"H


Recommended Uses For Product: Garage, Home


Mounting Type: Ceiling Mount


Room Type: Home Office


Heating Coverage: 2,667 sq ft


Burner type: Coil


Fuel Type: Natural Gas


Voltage: 120 Volts


Amperage: 2.3 Amps


UPC: 089301605602


Global Trade Identification Number: 02


Item Weight: 77.2 pounds


Department: Unisex Adult


Manufacturer: Enerco Group Inc.


Item model number: F260560


Is Discontinued By Manufacturer: No


Care instructions: See product manual


Assembly required: No


Number of pieces: 1


Warranty Description: 3 year limited on parts 10 year limited on the heat exchanger.


Batteries required: No


Included Components: 2 angle brackets for ceiling mount, Heater, Manual, NG to LP conversion kit


Import: Imported


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Mar 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Great heater
Style: Heater
Received the heater in short time from ordering, very happy with it installed,converted to propane, set the gas pressure, checked for leaks, fired it up to burn off oils. It does not have a pilot burner, happy to see that, lights straight off the inshot burner no more having to clean pilot orifice every fall. My last heater cost more for parts to get it up and running than this heater cost new, no brainer. Good heater for the money should last for years . PS. When I was working I was an installer for a propane company, just saying. ... show more
Reviewed in the United States on December 8, 2025 by James E Hood
    • Great heater
Style: Heater
Good heater gives off great heat very efficient I would definitely buy another one not very loud
Reviewed in the United States on February 17, 2026 by Lonnie Cahoy
    • Perfect for my shop
Style: Heater
Review Image by Manny Myers Manny Myers
Review Image by Manny Myers Manny Myers
I have installed this in my 37' X 27' building with 18' tall ceilings, and it works great. I am in southern PA and keep the building at 40 through the winter just to keep everything from freezing. When I want to go out to the building to do some work, I use the Wi-Fi thermostat that I have connected to it and bump it up to 60 and 15 mins later the building is really comfortable. I would suggest having some wall mounted fans to help push the warm air down if you're using this in a tall building like I am. The unit is really quiet, to the point people don't even know it is running. it was also very easy to install. you will need one person to hold it while another secures it if you don't have a way to block it up. ... show more
Reviewed in the United States on January 22, 2026 by Manny Myers Manny Myers
    • works good fan way out of balance
Style: Heater
fan way out of balance causing unit to shake bad blades were bent was an easy fix just pushed fan blades so they were all straight to one another but unit works great otherwise
Reviewed in the United States on November 14, 2024 by Nathan
    • Fast heat for 34x48x14 garage
Style: Heater
Good deal. Easy to install. Directions were easy to follow for conversion to propane. Quiet operation.
Reviewed in the United States on December 13, 2025 by James S. Hancock
    • Works well when it works
Style: Heater
This is my second Mr Heater, I have a 50 btu unit as well. The 50k worked for 3 weeks before it stopped working and this one worked for about 1 minute. I fired it up and it worked perfectly. T'he next day the fan would not kick on. Have already been on the phone on hold for about 45 min before leaving a call back number. They will call back, ask me some questions, then say they are sending out a new circuit board, which is what my other one needed also. I'm being generous by giving them a 3 star review, but i'm keeping in mind the cost of the unit which is a really good value. I really like the heater, I just don't know if i can depend on it. Every time i've been on hold with them the recording says they are receiving unusually heavy call volume. Since they clearly know they are selling an unreliable product, it would be nice if they would hire more service tech advisors. I probably spent 3-4 hours with my other heater between time on hold, diagnostic time and actually replacing the circuit board. If you don't like working on stuff you might want to look at a different brand. If you do decide to purchase one just plan on doing your own diagnostics and repairs. Update 1/29/2020- Have been on the phone 3 times doing diagnostics on this heater. It is working but the problem now is that it cycles on and off about every 30 seconds to 2 minutes. I have been asked to checked the voltages in and out of the circuit board and check the pressures sn column of water. The last guy had me disconnect the pressue switch and bypass it. The heater ran for several minutes while he stayed on the phone so he sent me out a new switch. I installed it and it is still cycling. Back on the phone for the long hold and unusual call volume. They called back after a couple of hours and said they were sending me a new control board. 3/25/2020 Installed new control board. Heater still cycles on and off. I'm not getting back on the phone with this company again. Still heats my shop, just not nearly as efficiently as it should. Not very happy overall. Paid new price for a brand new heater and Ive wasted hours of my time for something that has never worked properly and never will. ... show more
Reviewed in the United States on January 20, 2020 by David C.
    • Awesome little heater, even on propane!
Style: Heater
Hung this in my 1300sqft shop. I have it hooked up to a nest thermostat. It works great. This was a replacement for a very old Reznor 75k BTU. I am running this on propane and it heats much faster than my old Reznor. The fan is quiet.
Reviewed in the United States on November 3, 2025 by jlasersmith
    • Absolutely wonderful heating unit.
Style: Heater
Absolutely wonderful. It comes with easy to follow instructions.
Reviewed in the United States on January 13, 2026 by Tammy Taylor

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