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Mr. Heater MH18B Big Buddy Indoor/Outdoor Propane Heater F274800

SKU: 60530183  |

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Regular Price: $119.99

Special Price: $109.99

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Mr. Heater MH18B Big Buddy Indoor/Outdoor Propane Heater F274800

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The Most Popular Portable Propane Heater in North America. This patented radiant 4,000-18,000 BTU Liquid Propane heater connects directly to two 1 lb. cylinders and is the perfect solution for heating enclosed spaces like cabins up to 400 sq. ft. An integrated fan increases the heating capacity of this unit, blending radiant and convection style heat to give you the best of both worlds. Two swivel regulators give you the ability to adapt usage from disposable cylinders to a remote gas supply with the purchase of a single hose and filter. To light the unit, simply push and rotate the knob. The built in Piezo sparking mechanism will take care of the rest. With the Oxygen Depletion Sensor (ODS) and accidental tip-over safety shut-off, you can be sure that you will enjoy years of comfortable indoor safe heat.

Product Features:

  • 4,000, 9,000, or 18,000 BTU per hour
  • For use with propane gas
  • Heats up to 400 sq. ft.
  • Single control start knob
  • Hi-Med-Low heat settings
  • Swivel regulators
  • Automatic low oxygen shut-off system (ODS)
  • Accidental tip-over safety shut-off
  • Connects to two 1 lb. cylinders
  • Connects to a 20 lb. cylinder with optional hose
  • Fan operates on 4 - D batteries or AC adapter, both sold separately


  • Emergency Heat
  • Tents/Campers
  • Workshops/Garages
  • Job Sites/Construction Trailers
  • Patios/Decks
  • Storage Buildings
  • Tailgate Parties/Sporting Events
  • Barns/Sheds
  • Hunting Blinds/Ice Fishing Shanties
  • Shelters



BTU Per Hour 4,000 / 9,000 / 18,000 
Heating Area 400 sq. ft.
Tank Capacity (min)  2 x 1 lb. Propane Cylinder
Electricity Required No
Weight 17.10 lbs.
Model MH18B
Length 19.00 in.
Width 12.00 in.
Safety Tip-Over Switch  Yes
Thermostat No
Brand Mr. Heater
Oxygen Depletion Sensor (ODS)  Yes
Manufacturer Warranty 1 Year Limited
Hose & Regulator Included Sold Separately
Fuel Type Propane
Heat Type Radiant
High Limit Safety Shut-off (HLS) No
Ignition Piezo
Indoor Safe Yes
SKU 60530183
Model F274800
Weight 17.5000
Color No
Size No
Width No
In Store Only No
Price $109.99
LIMITED WARRANTY: Mr. Heater, Inc. warrants its heaters and accessories to be free from defects in material and workmanship for a period of 1 year from date of purchase. Mr. Heater, Inc. will repair or replace this product free of charge if it has been proven to be defective within the 1-year period, and is returned at customer expense with proof of purchase to Mr.Heater, Inc. within the warranty period.
Product Manual

Customer Reviews

excellent product - great service from RK Review by Bob

love the product and love the RK service!

(Posted on 2/26/2015)

Bought in Nov, Caught on Fire in Feb Review by Lauren

We're not sure why, but after using this unit successfully all winter with a 12 ft hose to heat the garage, the unit started on fire yesterday. I haven't run the fan on it since the first use because I saw little value in burning thru the expensive D batteries and it seemed to heat the garage fine w/o them.
The fire alarm first went off while the unit was on, but we couldn't tell it was the heater, as it smelled and smoked like an electrical fire so we were checking all the battery chgrs and other connections in the garage. We shut the heater off as it was warm in the garage and we had to open the doors to air it out. My husband said it couldn't be the heater, because it smelled electrical so we concentrated on finding what had burned. We closed the garage door and I turned on the heater again while we searched.
About 3 - 5 min after starting the heater, it erupted in flames in the area where the hose had connected. This connection really hadn't been touched since it was hooked up in Nov. We only used the far end to connect to various propane tanks. At this point, we don't know if it was the hose that failed, or if the unit itself caused the fire. Since it first had the electrical smoke, we're thinking it's the unit itself.

I'll be contacting the vendor for this when they open tomorrow, but Im very concerned if folks are using this in their homes or in garages/shops while they're not there all the time. I'd be very cautious about this product. Our Little Buddy heater has run for the past 2 yrs without issue, but we're watching it much closer now too.

(Posted on 2/8/2015)

Great Product...TERRIBLE TECH SUPPORT Review by Peter W

I've purchased both a Big Buddy Heater and a Mr Heater Blue Flame heater in the past year. Both are excellent products, well-designed and well-made. However, when I had a minor issue with one of the heaters, I left FIVE messages on their "Leave Your Number and We'll Call You Back" option, after waiting on hold for over thirty minutes on other attempts. Those calls were made six weeks ago....I'm still waiting for a call back. Great products, but KEEP YOUR FINGERS CROSSED THAT YOU NEVER NEED TECH SUPPORT!!!!

(Posted on 1/23/2015)

Mr Heater big buddy Review by Stu

excellent product and excellent service

(Posted on 12/28/2014)

Great heater Review by Jerry

Really heats a room up fast.

(Posted on 12/19/2014)

MH18B Review by Jim Hardy

Work great.

(Posted on 12/3/2014)

Great product Review by Greg

Should have waited until Black Friday, Orschlein had them for $89.00
That is what they sell the small ones for.
Excellent heater anyone.

(Posted on 11/29/2014)

It's a gift Review by Joe

Looks great!

(Posted on 11/26/2014)

the best Review by ricky

Fast shipping a great place to buy from

(Posted on 11/21/2014)

Good product Review by Tom

Very nice heater. Lots of heat.

(Posted on 11/8/2014)

big buddy heater Review by Randy Hall

good heater,very little smell,lights easy,get the hose

(Posted on 11/7/2014)

Mr. Heater Big Buddy Propane Heater #MH18B Review by Rita

Bought this heater for our cabin. Also 12ft.hose with regulator, 20 lb tank and A/C adapter for blower. Works great ! Love it !

(Posted on 11/5/2014)

great product best pricing I could find anywhere Review by Davc

I used it in my deer blind worked great even though my blind is very drafty, no insulation, no windows (just open holes) kept me nice and warm, would be nice if it had a speed adjustment on the fan to turn it up some, fan seems like its on low but still sufficient. used two small propane bottles in 4hrs on med + high heat settings

(Posted on 11/3/2014)

One really nice unit Review by Robert Ciciulla

I live in the Northeast, and this heater arrived just in time for the big snowstorm on January 3rd. There was about eight inches of snow on the roof (made of glass) of the solarium attached to the back of my house. The PTAC in the room usually does the job, but at the near zero temperatures during the storm, it was struggling. I put the heater in the room, and turned it up "full blast". The two gas cylinders lasted about 3 1/2 hours, got the room up to 80 degrees, and made quick work of the roof snow. The room is 12x12 with a 14 foot ceiling at it's peak. It did a great job!

(Posted on 1/10/2014)

Cozy Warm Review by Crystal Brown

If you read will learn......

This unit works AWESOME...when used correctly. Pay attention.
I hate long wordy reviews so this is to the point.

Don't use the 1lb disposable propane tanks, for many reasons: they don't last long, enviorment, they freeze up (on high), they freeze the internal regulators.
So, you need a 20# tank. Got a gas grill? That is a 20# tank......go get it filled.

Hose: Do NOT get the plain hose and filter...again, many reasons: no pressure regulation creates oil, clogs unit, unsafe....
So, get the hose with, no filter needed, unit wont clog.
Yes, it is an added expense so plan on it. You need the unit, a 20# tank and the hose WITH regulator.
PLUS: hose with regulator has the quick release....nice!

C'mon, you have never hooked up a gas grill to a propane tank without a regulator. This is no different.
Once you have these three correct items...this thing is great!

Fan/blower: kind of crappy. I'm glad it has it and I'm glad I can use batteries in a jam. But you either need the A/C adapter for $20 OR any other fan....Just something to move the heat around. This unit produces a LOT of heat. It rises straight up. The blower moves it around and heats areas more quickly. For $20 and free shipping, I just bought it. I'm not bringing a fan everywhere I use this.

If you follow these simple things you will be very pleased.

Unit is on high, no shut off, no freezing, no problem. Running for 2 hours straight now....on high.
You can use the 1 lb tanks and this can go camping and everywhere else. But if you plan on using at home or someplace constant, you need the 20# tank, or larger, and the Hose WITH regulator.

If nothing else, this unit could keep your pipes from freezing in an outage during winter. HUGE savings there alone. Then use it all over until/if that happens.

For under $200 I bought the Big Buddy, the correct hose with regulator and the A/C adapter. Free shipping and here in 2 days.
You can't get this kind of heat for indoor use from another heater this safely (low o2 sensor and tipover sensor).

(Posted on 9/23/2013)

Nice portable point source space heater. Review by Warm n cozy

I had a surplus military truck that needed to be picked up in a northern state and was concerned that the trucks heater wouldn't be up to the task. Anyone that's been in the Army knows what I'm talking about.

I used the Big Buddy heater with the optional 12' hose/regulator that allowed running the heater in cab with a 20 lb propane bottle and two sets of "D" cell batteries. Having a safety shut-off for CO and tipping over is a plus.

It was nice to have real heat in the truck instead of lukewarm air that the truck heater put out.

The only negative item was that the factory box wasn't sealed with tape. The box appeared a little beat up, but the foam packaging did it's job. Next time tape the box shut before shipping.

(Posted on 2/23/2013)

great Review by howie51

bought this for ice fishing and back up heat source .great heater if a person loses power

(Posted on 2/19/2013)



(Posted on 2/17/2013)

very happy,great value,wife loves it Review by Scott

My family really enjoys the heater,it is a great thing for sporting events.

(Posted on 2/6/2013)

Great value from Rural King Review by Garysco

I bought this BigBuddy propane heater from an EBay auction and am very happy with the product, price I paid and quick shipping.

(Posted on 2/6/2013)

Mr.Heater. Big Buddy Heater Review by Mr.Hosa

Thank-You......Mr.Heater.....On A Beautyfull Model Design Heater. I have Purchase This Heater Today- Jan.28.2013. And I Will be ready To ( Battle )or should Say have back Heat for the first time...I live in the north sky montains in Canada And in the morning we are expecting Freezing rain and snow and the 9.yard. well I have Now A Back-Up...Thanks To Mr.Heater.And to all my Family And Friends in The Good-Old U.S.A. For there Good Advice And Recommendation As They ALL -Have or Own one......So Not Just C.S.A. Aprove it is Family And Friends..Aproved......P.S.Cant Beat That...........

(Posted on 1/29/2013)

I like this heater Review by Fred

I have had one of these this one is for my son.

(Posted on 11/18/2012)

Big heat for a little unit Review by ed

I can't believe how much heat comes out of the little box very good at heating my 2 car garage.

(Posted on 11/15/2012)

Great Product Review by Cabin Fever

Rural King had the lowest price I could find on the internet. The nice thing about the Mr Heater Big Buddy MH18B is all the safety features it has for indoor use and the ability to use either the 16 oz propane bottles or the larger 20 lb tank. I have not had a chance to use it for it is still summer time here in California, but look forward to warming up the old tent at deer camp and at home this winter. I have called Mr Heater on 2 seperate occassions to ask a question and they are always very nice and helpful. At this point in time I believe one cannot go wrong with any of the Mr Heater Products.

(Posted on 8/29/2012)

Awesome Little Heater!! Perfect for Emergencies Review by DW

We had one of these during the Ice Storm in February 2011. Lost power for two and a half days. Was perfect to heat about a 200 Sq Ft room kept that room at about 60 on the lowest setting (4000 btu) while the house dropped to the mid-thirties. Could get the room well into the eighties if I turned it up. On the lowest setting the two small tanks lasted about 12 Hrs.

(Posted on 7/16/2012)

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Q & A

Product Questions

Sort by ASC
What is the model number of the hose with regulator for this unit that is talked about in the reviews and recomended. F273702 doesn't have a regulator with the hose.
How long will the Big Buddy run @ 18,000 BTU's on 20lb tank?
Only one side of my Big Buddy heater will light. Is there something I need to do to get the other side to light, or is mine defective?
does the heater take two 1lb tanks or only one