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Mr. Heater

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

  • Based on 784 reviews
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This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026

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Availability: In Stock.
Fulfilled by Northern Tool + Equipment
Arrives Tuesday, Nov 11
Order within 7 hours and 55 minutes
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Features

  • Your purchase includes One Mr. Heater Big Maxx Natural Gas Heater with 2 angle brackets & Liquid Propane conversion kit | Thermostat, hose & regulator not included
  • Heater dimensions 29.33 L x 15.50 W x 26.37 H | Coverage area 2000 Sq. Ft. | Performance 80,000 BTU | Amps 2.3 | Voltage 120 V | Min 8 ft. clearance from floor to base of unit
  • For use with natural gas | Category 1 vertical, category 3 horizontal venting
  • Powered exhaust allows for vertical or horizontal venting | Spark ignition features self-diagnostic control module
  • This heater offers the operating versatility and safety that you have come to expect from Mr. Heater | Limited 3 year warranty on parts and burners

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: High temperature safety shut-off


Color: Black


Form Factor: Unit Heater


Indoor/Outdoor Usage: Indoor


Brand: Mr. Heater


Special Feature: High temperature safety shut-off


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: Radiant


Fuel Type: Natural Gas


Voltage: 120 Volts


Amperage: 2.3 Amps


UPC: 089301605602


Global Trade Identification Number: 02


Item Weight: 86.5 pounds


Department: Unisex Adult


Manufacturer: Mr Heater


Item model number: F260560


Is Discontinued By Manufacturer: No


Care instructions: See product manual


Assembly required: Yes


Number of pieces: 1


Warranty Description: 3 year limited on heater parts; 10 years limited on heat exchanger.


Batteries required: No


Included Components: heater, natural gas to propane conversion kit, and ceiling mounting brackets


Import: Imported


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Nov 11

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
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  • 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 Value And Well Constructed
Style: Heater
I bought this heater mostly because Northern Tool had them on sale at a great price with free shipping. So yeah, I'm cheap. I like a bargain. I was pleasantly surprised when the heater arrived and I saw the quality of the overall construction. I was afraid with a cheap price I would receive a cheap heater. I am however beyond happy with it. It is a great product and is built like a tank. ( Which is a good thing... read the last part of my review.) The installation was painless and easy and I converted the unit to Propane from the original Natural gas. The propane kit was easy to install with clear and concise instructions on how to do the conversion. This heater is heating a 24 X 36 shop with R-13 insulation and twelve foot ceiling height. So far it has not shown itself to be a gas hog like others have described it. It has been down to ten degrees at night and the heater maintained the forty degree setting with ease and not much fuel use. The only issue I had was with the shipper and not the product or with Northern Tool. I hate pointing fingers but the shipper had beat my heater up to the point where it looked like it had been delivered by airplane and dropped from about a thousand feet! It is a good thing the heater is constructed as well as it is because otherwise it would have been useless! It is a real testimony of how well the unit is constructed because I was able to make repairs and straighten all of the damage. Then after a close inspection of the vital components we fired it up. So far I highly recommend this product and the Mr. Heater brand. ... show more
Reviewed in the United States on November 18, 2019 by SL
    • Works great
Style: Heater
Delivered quick, installed and works great. Keeps the entire garage hot and sometimes we need to take out coats off if we are in the garage. It is well below zero and this keeps up with a 2 large two car garage. My gas bill did go up but it sure beats the propane tanks and smell.
Reviewed in the United States on February 14, 2025 by Magicolor
    • Stay warm with Mr Heater
Style: Heater
Good product
Reviewed in the United States on October 25, 2025 by Gohen Maher
    • 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
    • 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.
    • Keep in mind the cost to install - but still great value!
Style: Heater
This is great value for money. Service was next to none. Keep in mind you will need to pay for a vent whether it is horizontal or vertical. Allow $300 approx for this. You may also need professionally installation as this unit requires connection to a propane tank (recommend at least 120 gal) and a regulator cost. With tank lease, regulator, 2 men to install, gas line, proper gas fittings all up $950. So the whole investment approx $2k. You could save by having the unit fitted in place with help, but you best be sure of the codes ie distance from walls, roof, floor etc etc because if this baby ignites your garage and burns to the ground and it wasn’t fitted to code and proves it was the cause - then - need I say more. The unit was fitted initially and vibrated horribly due to a bent fan blade damaged in transit. Picked up the phone and the supplier had a replacement sent in 3 days. Unfortunately, they sent the wrong one. However, 2 days later via FedEx the right one was sent. Fitted and works like a new one should. Some say it’s noisy but I can’t say it is. I can say it belts out some heat and so far economically. I will up date this when I’ve been through a cold season. Dec 2022 Update: fitted a nest thermostat and have this running at 56F whilst outside sun 30’s. I use around a gallon a day so out of a 120 gallon tank this thing keeps my shop cost for around 2-3 months. Around $300 a tank refill at current prices this beast is both economic and simply keeps me toasty and in my shop a hell of a lot. I’m a happy chappy! ... show more
Reviewed in the United States on May 5, 2022 by John Marshall
    • Great garage heater.
Style: Heater
Fast delivery at a fair price. Works great
Reviewed in the United States on August 15, 2025 by Timothy
    • Great heater!
Style: Heater
I've purchased 2 of these for Garages they work very well if your garage is insulated. My husband installed , he has experience with gas and installed about 2hours
Reviewed in the United States on October 30, 2025 by Amazon Customer

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