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Mr. Heater

18,000 BTU Big Buddy Heater

  • Based on 5,620 reviews
Condition: New
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This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

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Availability: In Stock.
Fulfilled by The Factory Depot
Arrives Nov 21 – Nov 24
Order within 13 hours and 32 minutes
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Style: Space Heater


Features

  • Emits 4,000, 9,000 or 18,000 BTU/hr radiant heat
  • Designed and approved for indoor and outdoor use
  • Heats up to approximately 400 square feet
  • 3 temperature settings: low, medium, and high
  • The use of un-authorized accessories/attachments with this heater are expressly prohibited, may cause serious injury, and will void the warranty.

Description

Cold campsites and frozen lakes call for the warmth of a Big Buddy heater. For your next excursion, the Big Buddy will keep you comfortable with up to 18,000 BTU of heat. Swivel regulators make for easy setup; just screw on two 1-lb propane cylinders or connect to a 20-lb tank using Buddy accessories. The 450 square feet of coverage makes any ice shanty a sauna and any deck a sunroom. With the heaters’ registered Life Safety System you won’t sweat too much knowing the oxygen depletion sensor, thermal shut-down system, and tip-over switch are keeping you safe. For all of your indoor and outdoor adventures, the Big Buddy is there for you.

Brand: Mr. Heater


Special Feature: Low-Oxygen Safety Shutoff, Portable, Tip-Over Protection


Color: Red


Form Factor: Cabinet


Indoor/Outdoor Usage: Indoor, Outdoor


Brand: Mr. Heater


Special Feature: Low-Oxygen Safety Shutoff, Portable, Tip-Over Protection


Color: Red


Form Factor: Cabinet


Indoor/Outdoor Usage: Indoor, Outdoor


Product Dimensions: 16.7"D x 11.2"W x 12"H


Recommended Uses For Product: Desk, Garage, Garden, Greenhouse, Home, Office, Patio


Mounting Type: Floor Mount


Room Type: Bedroom, Dining Room, Home Office, Living Room, Study Room


Heating Coverage: 400 square feet


Burner type: Radiant


Fuel Type: Propane


Number of Speeds: 3


UPC: 089301004825


Global Trade Identification Number: 25


Item Weight: 13.01 pounds


Department: unisex-adult


Manufacturer: Enerco Group Inc.


Item model number: MH18BNF


Finish types: Polished


Care instructions: Please follow user manual for instructions


Assembly required: No


Number of pieces: 1


Warranty Description: 3 Year Limited


Batteries required: No


Included Components: Heater


Import: Made in the USA


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Nov 21 – Nov 24

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.

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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

    • Mr. Heater Big Buddy Heater, 4,000 to 18,000 BTU Propane Heater
I purchased this product because despite running two very efficient and very expensive heat pumps, my home was always cold. Additionally, my electric bill was becoming more and more outrageous. I was hopeful that the Mr. Heater Big Buddy Heater would at least be able to heat up my bedroom and also be able to heat up the master bathroom for showers and such. That said, I have been extraordinarily happy with the performance of the Big Buddy Heater. The heat output can be tailored to the exact needs of the moment, there are no unpleasant smells produced by the heater, and the fact that it puts out infrared heat makes it very pleasant to be near when the room is chilly. The heater is very easy to start with its piezo igniter and the heat produced is infinitely adjustable from low (4,000 BTU) to high (18,000 BTU). While the model I purchased did not come with the built-in heat distribution fan, I was able to add the factory fan with a purchase through Amazon (Mr. Heater Big Buddy Heater Back Cover Fan (E78404) (www.amazon.com/gp/product/B09S16JL8G)). I would recommend that everyone purchase the new Big Buddy Pro model that does come with the factory built-in fan. I use the Mr. Heater 6-Volt Power Adapter to power my heater's newly added fan (www.amazon.com/gp/product/B000HE6OAE). I also use the Mr. Heater 12' Hose with Regulator & Quick Disconnect (F271803) (www.amazon.com/12ft-Big-Buddy-Hose-Regulator/dp/B000UC7966) to supply low-pressure propane to my heater. I have found the Big Buddy Heater to be very efficient in its use of propane. It has saved me a great deal of money by not having to use my heat pumps to stay warm. In summary, I have been overwhelmingly happy with my Mr. Heater Big Buddy Heater purchase. I have had no problems of any kind with the product. Further, I have been so happy with the performance of the heater that I have purchased a second one. Mr. Heater should be very proud of this product. ... show more
Reviewed in the United States on April 6, 2024 by J. Harris
    • Very good heater and works great
I love these i have 3 of them. Great for emergencies.
Reviewed in the United States on October 7, 2025 by Sherri
    • Warm yourself by this fire!
This is an amazing heater! It arrived packaged nicely with no issues. It was easy to unbox and easy to follow the instructions. Installed the tanks and BOOM, I finally had warmth in my fully tiled ensuite! (You know how cold tiles get when it's cold outside and you don't have floor heaters built in!) As a matter of fact, I have to set this to the lower setting because it does such a great job of warming things up. I use it for the ensuite, the deck, and the garage and it works fabulously (much better than the other heaters!) Just put it in your basket, you won't be dissapointed. ... show more
Reviewed in the United States on March 9, 2025 by Dolly Ihli
    • Great Heater! ... needs info. re: what hose to use, for 20 lb. tank.
GREAT HEATER - and far less expensive to use, than the fuel for the big propane tank, that is “delivered by” the Propane Co. It also works MUCH BETTER than my propane heater in the living room! .... which is cast iron, and looks like a wood stove. This gives off MUCH MORE HEAT. And, it heats very quickly, and “without the noisy blower” that my living room heater needs to be even minimally effective.... but which is nerve wracking! This is a surprise, because I have lived with gas stoves that look like wood stoves, before, but this one at home, radiates very little. So this Mr Buddy Heater, was a god-send last winter! Issue: The hose, needed to connect this heater to the 20 lb. propane tank, is NOT specified in the data here; otherwise I would have ordered it “with the heater”. I ordered a hose from Amazon, that says it is for these types of heaters..... BUT now I see that this brand (Mr Heater Buddy) says - in its MANUAL - that certain “model numbers” are what they use with the heater. SOooo, almost a month later, I am still trying to figure out if I can use the hose I got from Amazon. The Amazon hose, “GasSaf” has no model number; it looks just like the picture of Mr Heater Buddy’s for this use.... BUT I will need to now, call the Mr Heater Buddy people tomorrow - to find out if I can use the one I bought - or IF I need to return it, and buy one from them. Meanwhile it has gotten much colder ... and I’d really like to use this heater. This whole step could have been easy IF they had a note about it in their data on the Amazon site. The Mr Heater Buddy, information needs to state what hose to use. And, it is a great item! ... show more
Reviewed in the United States on December 7, 2020 by Shastina Free
    • Powerful, Portable, and Perfect for Indoor & Outdoor Heat
Review Image by Steven Steven
Review Image by Steven Steven
The Mr. Heater 4,000-18,000 BTU Portable LP Gas Heater is a must-have for camping, garages, emergencies, or chilly outdoor gatherings. I’ve used this heater in a workshop and a tent, and it provides steady, reliable heat with three adjustable settings to suit different needs. The dual tank connection is a huge plus—it runs longer without frequent refueling, which is great for extended use. The built-in safety features, including tip-over and low-oxygen shutoff, add peace of mind when using it indoors. The rugged handle makes it easy to move around, and the black/red design looks great. Setup is quick and simple—just connect the propane tank, ignite, and adjust the heat level. It works great with 1 lb. propane cylinders or larger tanks using an adapter hose. One small thing to note: It’s best used in well-ventilated areas, even though it has safety features. Also, if using with a bulk propane tank, a fuel filter is recommended to prevent residue buildup. And here’s a quick joke: Why did the heater get invited to every winter party? Because it always brought the warmth! Overall, the Mr. Heater 4,000-18,000 BTU Portable Gas Heater is a powerful, efficient, and versatile heating solution. It’s easy to use, reliable in cold weather, and great for both indoor and outdoor use. A fantastic investment for staying warm anywhere! ... show more
Reviewed in the United States on March 3, 2025 by Steven Steven
    • Warming things up
Great product, easy and effective.
Reviewed in the United States on August 28, 2025 by Ricky D.
    • Great for camping side-by-side trips!!
Awesome little heater will heat a room real quick!!!
Reviewed in the United States on August 8, 2025 by Will
    • This will take the chill out of the garage air.
I use this in warming up my garage in the fall and winter where I can watch ball games and the like. It will not get me into the 70's, but makes the garage tolerable to enjoy games and a very good cigar as well as an adult beverage or two.
Reviewed in the United States on October 15, 2025 by Michael Smith

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