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Mr. Heater

Mr. Heater Buddy FLEX 11,000 BTU Radiant Propane Indoor/Outdoor Space Heater

Based on 1,206 reviews
Condition: New
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$129.00
Save $18.35 was $147.35

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This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027

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Availability: In Stock.
Fulfilled by Amazon
Arrives Nov 13 – Nov 20
Order within 21 hours and 47 minutes

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At a glance

Condition
New
Model
MH11BFLEX
Dimensions
13.5"D x 9"W x 14.25"H
Weight
11.7 lb
Color
Red
Form Factor
Portable Heater
Indoor/Outdoor Usage
Indoor, Outdoor
In the box
heater
Warranty
3 year limited.

Features 6

  • Emits 8,000 11,000 BTU/hr radiant heat
  • Designed and approved for indoor and outdoor use
  • Heats up to approximately 275 square feet
  • Runs up to 3.5 hours on low and 2 hours on high

Description

Stay cozy wherever your adventures take you with the Mr. Heater Buddy FLEX Portable Heater. Designed for both indoor and outdoor use, this versatile heater delivers 8,000 to 11,000 BTUs of radiant heat, ensuring you stay warm during your fishing trips, camping nights, or tailgating events. Its high wind resistance technology and omni-directional fiber mesh burner mean it stands strong against nature's elements, keeping you comfortable in 275 sq. ft of space. Crafted with self-extinguishing materials, the Buddy FLEX prioritizes your safety while offering seamless operation. Running on a compact 1lb tank or extending to a 20lb tank with an optional hose, it promises flexibility and reliability on demand. Whether you're in your workshop or out in the wild, the Buddy FLEX is your steadfast companion for warmth and comfort.

Specs 29

Brand Mr. Heater
Special Feature Adjustable Temperature, Low-Oxygen Safety Shutoff, Manual Thermostat, Portable, Tip-Over Protection
Color Red
Form Factor Portable Heater
Indoor/Outdoor Usage Indoor, Outdoor
Special Features Adjustable Temperature, Low-Oxygen Safety Shutoff, Manual Thermostat, Portable, Tip-Over Protection
Indoor Outdoor Usage Indoor, Outdoor
Power Source Gas powered

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Nov 13 – Nov 20

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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Top Amazon Reviews

Reliable Heat Source for Cold Weather Adventures
I’ve been using the Mr. Heater Buddy Flex Heater for a few months now, and it has exceeded my expectations in every way. Whether I’m out camping, in the garage, or just trying to warm up a chilly room, this heater delivers quick, even heat and keeps the space comfortable. The adjustable 8,000–11,000 BTU output makes it versatile for different situations, and I love the 180° design—it really helps the heat spread out efficiently. It’s compact but powerful, and I appreciate that it has important safety features like the tip-over shutoff and oxygen depletion sensor, especially for indoor use. Set-up is simple, and it works great with both 1 lb and 20 lb propane tanks using the right attachments. Overall, it’s a durable, dependable heater that I’d highly recommend for anyone who needs portable warmth during the colder months. ... show more
Reviewed in the United States on April 30, 2025 by Steven
Great heater
Great heater and saved my butt in the cold Michigan Winters.
Reviewed in the United States on October 26, 2025 by Nick
Solid Heater with optional accessories
The Buddy Flex Heater is a compact and efficient portable heating solution, perfect for camping, garages, and outdoor workspaces. It features 180 degree heating, providing even warmth in all directions, and an adjustable output ranging from 8,000 to 11,000 BTUs for customizable comfort. The safety features—including an oxygen depletion sensor (ODS) and tip-over shutoff—enhance peace of mind when using it in enclosed spaces. It runs on propane and is compatible with the Buddy FLEX system, allowing for additional accessories. I used it all day ice fishing with the add on Flex Cooker. We had heat, cooked breakfast and lunch and used just over 1pound of propane. Overall, it’s a reliable and well-built heater for those needing portable warmth in outdoor or well-ventilated areas. Great for ice fishing or use in hunting shacks. ... show more
Reviewed in the United States on January 31, 2025 by Richard Currier
Good Purchase
Works well.
Reviewed in the United States on October 10, 2025 by Russell
Good, but some things to know...
First things first - this is replacing my Big Buddy, which gave me years of service but finally gave up the ghost. I found though that for my purposes the Big Buddy almost threw out TOO much heat on high, but not quite enough on medium. I gravitated to the Flex because it's a next generation product, and the temperature control allows for more variation. I also like the 180 degree heating area, something I had trouble accomplishing with the Big Buddy without setting it to high, and even then the angle was 45 degrees tops. This is a much more graceful product. The unit is built to be narrow instead of broad, which for me makes it a little easier to position. I appreciate the electronic ignition and the wind guard around the pilot. It's a bit fussy to get the battery for the ignition installed, and it does require a screwdriver. The instructions don't go into any detail on any of this, but it is fairly intuitive. The control knob is similarly fussy - it depresses well enough to get the pilot lit, but doesn't turn smoothly to go from pilot to low/high. Now then. Know up front that this drains a 1 lb bottle VERY quickly, especially on high. If you get a couple of hours out of a bottle then you're doing well. It is also a single-bottle setup. For sustained use, definitely get a coupling hose onto a 20 lb tank, and DEFINITELY get a fuel filter. Moreover, when shutting it down, turn the gas off at the tank then turn the unit off. You do NOT want propane sitting in the hose. It sounds like I'm criticizing the heck out of this thing, but in all actuality none of these are dealbreakers. It throws out heat quite well, and I'd say it's a more gentle heat than the Big Buddy. In my use I couldn't hear ANY noise outside of the normal flame sound (think gas grill...). While there's a great range (180 degrees...), owing to the lack of the Big Buddy-stye fan the direction is more Up than Out. Main takeaway there is that if this is on the ground, then great. If it's on a table, the use of a small clip-on fan mounted to the body of the unit to direct heat is advised. Note though that if you use a fan, the 180 degree range gets reduced. It's made...well, it's made very well. Love the integrated handle, and it's not overly heavy. Also love the capability of attaching a stove to this too - it does make camping a bit easier when it's chilly. I do wonder about the little "storage compartment" on the side, as it's not very large and about all it can hold is the operating manual (if that). But since my Big Buddy didn't have a storage compartment anyway, I can't say that I care about this one. One last critique - there isn't a cover for the tank compartment. Not really a sin, but something to be aware of if you're interested in aesthetics. I have to say though, the criticisms do NOT outweigh the advantages of this item. It brings up the space to a gentle heat, instead of force blasting an inferno through it. Sure it may take a bit longer to warm that space, but that time results in a more comfortable environment. I really like this item. ... show more
Reviewed in the United States on February 24, 2025 by J. Tant
Great camp heater
I bought this unit to heat a 10x14 canvas tent for winter camping. The very first time I used it, the outside air temperatures dropped well below freezing. I was extremely pleased with the heat this thing put out. Even with the freezing temperatures, it could keep the inside of the tent toasty enough that we had to turn it down. I also really like the safety features and ability to connect to a larger propane tank with a long hose. ... show more
Reviewed in the United States on March 31, 2025 by BJ Hudson
Item received broken
Received item with a broken ignition button. Did not realize it was broken until I took it out of its packaging several weeks ago after I could not return. There is no way to order the ignition button you can order a new ignition coil but that does not have a replacement button so this unit is useless. ... show more
Reviewed in the United States on August 18, 2025 by Stephen Zettlemoyer
Great heater!
Review Image by JAMES J ROUNTREE JAMES J ROUNTREE
This is an awesome heater! I received it today and brought straight out to use on the ice. It had my tent super warm and was great to look at. Starting the first time was tricky, but reading instructions printed on top of unit was a good idea 😆 turn knob to left instead of accessory side on right and push dial in while pushing ignition button then holding in for 30 seconds. my old buddy heater which is about 12 is still working great! ... show more
Reviewed in the United States on December 28, 2024 by JAMES J ROUNTREE JAMES J ROUNTREE
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