Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater, Red-Black

Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater, Red-Black

Buy Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater, Red-Black: Space Heaters – ✓ FREE DELIVERY possible on eligible purchases

What are mr. heater f232000 mh9bx buddy 4 features?

  • Make sure this fits by entering your model number.
  • Nullify
  • Imported
  • 4,000- to 9,000-btu radiant heater for spaces up to 225 square feet. Approved for indoor/outdoor use; clean-burning; nearly 100-percent efficient
  • When operating the heater at altitudes over 7,000 ft above sea level the heater may shut off.
  • Auto shut-off if tipped over, if pilot light goes out, or if detects low oxygen levels. Fuel consumption/burn rate (gal/hr) at 4000 btu = 0.044 gal/hr, at 9000 btu = 0.099 gal/hr
  • Fold-down handle; swivel-out regulator; connects to propane tank (not included); run time (hrs at max btu): 3 hours
  • The use of un-authorized accessories/attachments with this heater are expressly prohibited, may cause serious injury, and will void the warranty.

Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater, Red-Black AMAZON

Buy Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater, Red-Black: Space Heaters – ✓ FREE DELIVERY possible on eligible purchases

Looking for specific info?

Does anyone know or understand how is it this type of propane heater can be used indoors without causing carbon dioxide poisoning?

I think it can cause carbon dioxide poisoning based on the numbers below. For emergency heat, i will place the buddy heater in a fireplace and let the co2 and co go up the chimney with the radiant heat heating the room. I may also monitor the co2 levels and have co and o2 alarms in the room, but monitoring gas levels may not be necessary if all the exhaust gases go up the chimney. If the buddy heater is in a fireplace and the co2 levels remain low (in the room) then the co2 should be going up the chimney and the o2 levels should be high (in the room).
In the youtube video “are buddy heaters safe for indoor use? We asked a firefighter” they placed a mr. Heater in an rv and measured co and o2. Co rose to about 11ppm (35 is alarm level), o2 dropped to about 19.8% (19.5 is alarm level). They didn’t check co2 levels.
3 molecules of carbon dioxide are created for every 5 molecules of oxygen that are burned by propane (in the presence of excess oxygen-wikipedia). Burning 1% of the o2 with propane could increase the co2 by 0.6% (unless it goes up a chimney).
When the oxygen dropped from 20.8 to 19.8 the carbon dioxide level could have risen by 6000 ppm to 6400ppm or 7000ppm (5000 is alarm level).
400-1,000ppm co2 concentrations typical of occupied indoor spaces with good air exchange
1-year limited warranty on the mr. Heater so maybe it’s oxygen depletion sensor (ods) has a 1-year limited warranty.

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How long with the heater run on low with a propane small cannister?

Best guess is 4-5 hours on low. I sat in a hunting blind for 2.5 hours and the 1lb propane canister was about half empty.

Can i hook a large propane tank to his

Yes i use a 30lb tank, remember to buy the mr heater filter and pick up a small gauge for your 20lb / 30lb tank or you will end up having very little to no pressure/propane going through the hose to the heater. The hose threads are not the right size for the tanks, it has alot of play and does not allow the tip to seat properly into the tank.. Using a gauge corrects the issue because the threads match up much better then the standard tank threads. For more detailed info please see my review and pictures.

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Can i store the smaller, 1lb propane tanks on my terrace porch, possibly in a box, overall? In cold winters and hot summers?

For maximum safety, my recommendation is to store propane containers in a weather protected location, such as garage or shed with some natural ventilation. Propane is a highly flammable liquified petroleum gas that vaporizes and expands many-fold very quickly if released to atmospheric pressure, and will form a highly explosive mixture if released in a confined space without outside ventilation. If then ignited by a small spark such as a light switch, the resulting explosion may be catastrophic. There are on-line photos of boats that have exploded from propane leaks in the confined space of a boat cabin with catastrophic results including death of occupants. The cabin top and sides have literally been blown to pieces in such cases. New, sealed bottles of 1 lb size are reasonably safe, but once opened or partly used it is best to store away from occupied spaces. Although the probability is low, the consequences of failure are unacceptable. 20 lb propane containers should never be stored indoors. Play it extra safe and store propane bottles in a garage or outdoor shed. Bjg (pe, ichemical engineer, inactive, retired)

Would this work in a golf cart or is there an automatic shutoff that would be tripped when bumps were hit?

I would say no. We take ours to football games, and a couple of times it flamed out when the crowd got to stomping their feet. I’m sure it wouldn’t work in a moving golf cart.

Does this heater come with everything i need except the propane?

Yes, the heater is ready to go except you’ll need propane it uses the common stubby propane canisters used in propane lamps, etc. Of course, you can buy the optional extension hose and filter and connect it to a larger bbq size propane tank for much longer run time.

Is this heater appropriate for use inside a tent? I have a 15’x15′ canvas marquee with 6′ walls and a 10’peak.

Yes but with some caution.the tent will need to have some sort of ventilation for the heater. Fuel heaters without an outside vent installed, burn oxygen directly from an enclosed space. Any type of fuel burning heater emits different levels of carbon monoxide, some sort of venting is always required to keep oxygen levels higher and co levels might want to set it on a pad or piece of plywood. Directly underneath heater is normally room temperature or colder. A few inches in front of the heater the floor will become hot. Items placed within a couple of feet +/- directly in front and above the heater potentially become extremely hot.

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Slow and steady heat thru the night or heat the motorhome and turn off before sleeping?

Slow steady heat or fast and steady depending on where you set the thermostat. It will turn off once it gets to temp or the lp tank is empty. I leave mine on all night if it’s cold. Keeps the floor warmer for bare feet.

Is this really safe to use in a tent while sleeping?

I will answer this carefully. I have used this in a tent on multiple occasions while camping in montana and the sierra nevadas. I have also used this heater in a small 200 sq ft cabin. It is safe for indoor use. However, even with the guard on the front, it is hot where the ceramic is that heats up, (see the orange area in the middle of the unit). I would think it is hot enough if something flammable touch it, so understand that it is safe for indoor use as specified with the manual, but it could ignite a blanket or something that would burn if it touched the ceramic. I never had anything catch fire and am only stating this as a warning. It is a great little unit and will definitely heat up a tent. It was 22 degrees on multiple days in montana and while i would have survived without it, it made it very comfortable to camp with. Great little heater.

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How long will it run on one tank (full power)?

I burn thru 1 pound tank in 3 hours on high. Pretty sure they say in the specs ‘run time 3-6 hours’ showing the shortest time is at max burn rate.

My son plays year-round baseball…looking for something to have in the bleachers to keep me warm. Is this a good product for this situation?

My daughter plays soccer year round & that’s all i use it for. It can be below 40degf w/ windchill when she plays at times, so it will definitely keep you(& 1 other) warm/hot. Depending on how much room you have on the stands, i place it on the bench below me. Once you place it, try not to move it because it has a sensitive tilt shutoff. The only problem is having to carry it & a stadium seat. I’m planning to make a backpack carrier for it.

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What heater can i use at 8000′ in the colo mountains?

I used my buddy heater at 9,500 without any problems in colorado.

How long will this run on a large propane tank? Need it for tent at night on 6 night camping trip.

When you say ‘large propane tank’, is that a typical 20 pound tank like on most bbqs, or 40 pound, or other?
I ran this with it on ‘high’ setting where i burned 4 pounds in 12 hours hinting 1 pound lasts ~3 hours. If you only need it on ‘low’ it may last twice as long. That’s the best info i can give you where you can figure the 20 pound tank could last 60-120 hours, etc.
Note, if you get a tank from those ‘cylinder exchange’ deals at many stores, those tanks are only filled 3/4 of the way with 15 pounds (not 20), so those won’t last as long. So you’re better off taking a tank to a place where they refill your tank in front of you rather than doing those exchanges (it will last longer from really being filled and most places charge $3 gallon for under 5 gallons they hold totaling under $15, the exchanges are $18+).

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Does this heater have a fan and if so, can it be used with adaptor as well as batteries like in the big buddy heater?

This does not have a fan. It is radiant heat only. I have a 550 square feet apartment and left the lil budy on high for 1 hr. It got close to 79 degrees in an hr. And i live in alaska. Had my home heater off as well

Can this be used to warm a jeep going to work?

Yes. I use this in my 69 vw bus and it works great! Have used it for 3 yrs now. I don’t dread or avoid driving in the cold now. Main things:
1. Secure it somehow so it doesn’t slide around your vehicle (i use strong magnets hooked to the back).
2. Keep any combustibles away from it! Especially in front and above it.
3. It is an open flame source inside of your vehicle–so be super careful and mindful of it at all times, of course.
4. Always remember to shut it off–may seem obvious, but still…
5. Jolting movements can trip the auto-shutoff. But not a big deal to restart it. Also you said you’re driving to work not 4-wheeling so it should be fine.

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Can it be used in a ice fishing shelter

Yes it can! I use mine for that and it’s
amazing. Ice fishing in a t-shirt

I see in the manual they say the unit is for ’emergency indoor use’. Is that the case?

I purchased it in case of a power outage but i do use it to warm up a room in the mornings for a hour or so
without any problems. I also use a first alert co alarm.

Do the cylinders of propane have to be inserted outside? What do i do in a blizzard when power goes out and i need to use this heater?

Canisters can be inserted indoors. When using this heater i suggest keeping away from things that are flammable and youngsters.

Potential first time buyer. How does this work? Do i just hook up the portable 1 pound propane canister and turn it on?

To light this heater you must first connect up a gas source (either a 16 oz ‘disposable’ tank or a refillable tank with a hose like the f273704).
With fuel connected you twist the dial from ‘off’ to ‘pilot’ and press down the knob. As you hold the knob down you may hear a slight hissing of gas coming out the front of the heater and it likely won’t light on the first try, so release the knob and press it down again after ~5 seconds. Each time you press it down there will be a spark on the front that is intended to light the gas. Once you see a blue flame (after repeating the pressing a few times) hold it down for ~20 seconds, then release the knob and twist it to ‘low’ or ‘high’ as you wish. You should instantly see the burner light the gas and after ~ 30 seconds it will be glowing orange.
That’s all there is to it (other than the careful planning like where you’ll have it, be sure papers & things that will burn aren’t too close, etc). Note even the floor may get too hot right in front of it, so that requires some thought as well.

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How long does this heater take to cool down? I’m thinking of using it at my kids outdoor sporting events.

This heater would be great for things like that. In my experience, it is very quick to cool off and is better protected and safe for indoor/outdoor family use. I love it!

Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater, Red-Black AMAZON

Buy Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater, Red-Black: Space Heaters – ✓ FREE DELIVERY possible on eligible purchases

What are our customers saying?

5Expert Score
An amazing, robust and powerful portable propane heater; i use it daily in an outdoor greenhouse dome tent office space

I have, over the past few years, grown tired of trying to use a small portable electric heater (with two heat settings, rated at 850w and 1500w) to heat an 8.5 x 8.5 foot greenhouse dome tent (the ceiling of this dome tent averages 7′ to 8.5 feet in height) that sits in my backyard and has been adapted for use as an outdoor office and meditation room. This outdoor dome tent, which occupies about 72 sq. Ft., and about 585 cu. Ft. Of space, and which has translucent plastic tent walls, sits on the ground, and the floor is a tarp sitting on the ground, covered with some old carpets for a bit of comfort.

This dome tent is entirely uninsulated, and, due to the translucent walls that easily allow heat to escape even in the near-infrared (nir) and visible light regions of the spectrum, it offers even far less insulation than would a tent structure of the same size/volume that used an opaque material such as green tent fabric. This dome tent is equipped with eight zippered screened windows (four near ground level, and four at a height of 6′ above ground) and i always leave each window partially unzippered year-round to allow for the flow of fresh air into the dome tent; this is important at all times anyway for adequate ventilation, but it becomes doubly-important when using a portable combustion heater such as this heater inside a dome tent such as this!

So, as a result of the factors that i have discussed above, this structure has always been somewhat of a challenge to heat using the 1.5 kw electric heater whenever outdoor temperatures have falled significantly below about 55 degrees f, and it has been impossible to get the interior to anywhere near even 70 degrees f when outdoor temperatures have dropped to 50f or below.

So, i finally decided to stop using the portable electric heater and to upgrade to a protable propane heater that was rated and certified as indoor-safe, and that could deliver at least 8,000 to 9,000 btus of heat. I finally purchased (via amazon marketplace) this mr. Heater mh9bx portable propane heater, which has heat settings of 4,000 btu and 9,000 btu, after careful research into each of the various brands and models of portable propane heaters available on the market. I particularly liked the stable and robust design of this heater, and the fact that it has auto-shutoff for tilting, auto-shutoff for low oxygen levels, and also because of the pilot light and the built-in piezoelectric igniter.

At the same time that i ordered this heater, i also ordered a mr. Heater 12; propane gas hose, and a mr. Heater inline propane gas filter for use with it.

When the unit first arrived, i tested it for a week using a 1 lb. Propane tank as the propane fuel source, and then, when that first tank had emptied, i installed the propane fuel filter and the 12′ hose running to a 20 lb. Propane tank outside the dome.

I am extremely pleased with the performance of this heater. It is easy to use, and it produces a lot of heat, far more than my old electric heater did on its high power setting of 1500 w. In fact, i have run tests over the past few days (late october 2013, at an altitude of 1,000 feet in the appalachian mountains, where we live) in the early morning hours, at about 4 am (three hours before sunrise), where outdoor temperatures were about 36 degrees f with a 2-4 mph wind, and where the starting interior temperature inside the dome tent was also 36 degrees f. Using this heater on the high heat setting (it is rated at 9,000 btu at this setting), the interior temperature of the tent was raised to above 70 degrees f within 6-7 minutes from start (this is amazing to me!), and was raised to 82 degrees f within 25 minutes of start; the interior temperature finally stabilized during each test run at about 83 degrees f while the outdoor temperatures were still at 36f.

Given the fact that this dome tent has a lot of interior volume for its floor dimensions, and also because this dome tent has very poor insulation (the average insulation rating for the translucent plastic tent material on the walls and ceiling is less than 0.1 r, and the floor, consisting of a tarp and some old carpets sitting on bare ground, also has about the same terribly poor r rating, and also beause of the fact that i always leave all 8 zippered windows in the dome tent partially cracked, i am amazed that this little heater is able to heat the interior to of this structure, in the middle of the night (therefore there is no incident heat from sunlight entering the structure) from 36f to 83f in a bit over a half hour; this is an increase in interior temperature of 47 degrees f (over outdoor temperature and over interior starting temperature) in a structure that is entirely uninsulated and that loses heat very rapidly! In fact, this is an acid test for a heater such as this, for this is a kindof worst-case test for a portable heater!

My above-cited tests, along with others that i have not enumerated here, show me that this heater, on the high heat setting, should be able to keep the interior temperatures of this totally-uninsulated dome tent at a comfortable level down to outside air temperatures of around 20 degrees f, and should be able to keep the interior temperature at ‘usable’ levels down to outdoor air temperatures of below 10 degrees f/

if i could give this little portable combustion heater an amazon rating of 7 stars instead of 5 stars, i would do so!

And now, since i am a scientist and an engineer, let me share a few caveats with you about the use of this heater, and of any portable propane heater:

particularly if using this heater indoors, you will want to be absolutely sure to follow the manufacturer’s safety recommendations to carefully check all propane gas connections for any possible leaks after installing, and to check them again prior to each use, tightening connections as needed to eliminate even small propane gas leaks.

When you are first starting the stove after having installed a new 1 lb. Propane tank directly (i.e,. No hose used) to the heater, bear in mind that the pilot light will not immediately light, and that even when it first lights, it will likely go out (i.e., extinguish) a few times for the first 45 to 60 seconds, because of air present in the internal propane gas line. Thus, you may need to hold the pilot light control down for a few seconds to purge any air present in the propane line before the pilot light will stay lighted. In other words, after having changed tanks, remember to bleed the fuel line by holding the pilot light control down prior to sparking, else you will be ‘wasting’ some sparks!

And, of course, once the pilot light has ignited and stayed lit, it is important to hold down the pilot light control for at least 30 seconds until the internal pilot light safety thermocouple has warmed up sufficiently to allow the pilot light to stay lit.

When you are first starting the stove after having installed a new external propane tank (usually a 20 lb. Tank) using propane gas hose (they are available in lengths ranging from 5 ft to 12 ft) remember that ths hose will, at first, also contain a lot of air, and thus you will wish to bear in mind that the pilot light will not immediately light, and that even when it first lights, it will likely go out (i.e., extinguish) repeatedly a few times for the first 60 to 90 seconds because of air present in the internal propane gas line. Thus, you may need to hold the pilot light control down for a bit seconds to purge any air present in the propane line before the pilot light will stay lighted. Once any stray air present in the propane gas line has been cleared, the pilot light will then stay on continually. In other words, after having changed tanks, remember to bleed the fuel line by holding the pilot light control down prior to sparking, else you will be ‘wasting’ some sparks!

Late update, as of october 27, 2018:
this amazing little heater is still working perfectly! I love it!

5Expert Score
Works well

I used this while hunting in colorado at 10,000+ feet in november. It snowed on us twice and got down into the 20’s at night. My kodiak canvass tent is 10 by 10. This heater definitely took the chill off. It was usually about 25 or so when i went to bed. Within minutes i could feel a temperature difference in the tent. When left on all night it would keep the interior of my tent at about 53 to 58 degrees, dependent an exterior temperatures. I had a co alarm with a digital display on a table next to my cot. I tested this alarm prior to leaving the house and it worked. I never noticed the bar graph fluctuate and the alarm definitely never went off in the tent. I used the mr. Heater brand gas line so i didn’t need the recommended filter. I had this hooked up to a 10 gallon (40#) lp tank. It was on all night, every night for a 10 day hunt. At the end of the trip, the 40# tank still felt relatively full and heavy. It ended up taking four gallons on a refill. Now i did keep my gable vent open for airflow. The heater has built in co and tip over sensors and is supposed to shut down in the case of either or. For extra peace of mind, i placed this thing on a welding blanket and as stated earlier i had the co alarm next to my cot. I did keep the lp tank outside under my tents vestibule and snaked the gas line through the corner of the door. Instructions say keep the infrared burner clean of dust and debris. For this reason, i kept the box and the plastic liner that goes over the unit inside the box. That is what i store it in during the off season. All is good with mr. Heater. Totally recommend. Proven to work at high elevations in extreme weather.

5Expert Score
You can really trust this heater

Went tent camping. Brought 40# propane tank and bought the appropriate hose (really only buy the f273704 if you don’t want to worry about changing filters). It was cold out so we covered the screened roof of the tent with a sheet (over the screen, under the nylon cover) so there would be less heat loss and as a result, less ventilation. The heater does make a tiny bit of smell, so it’s hard to know for sure if you’re being gassed to death or not. (this is gas after all, and i don’t f around where my kid’s safety is concerned). But hubby also brought a brand new two-thousand dollar digital co2 detector he borrowed from work. I tested it by breathing on it, and it registered 1 and alerted. We ran the mr heater in the tent for 3 days straight and the co2 detector stayed at zero the entire time. It also showed oxygen levels, which are normally 28.8 and it never went below 28.4.
I would advise if you’re going to use this in a fishhouse or other highly enclosed area, go get a cheap c02 detector just in case, but know that this thing has my full trust and i would recommend it to anybody.
Note that it does not have much temperature variance. You choose from high or low only. We had it on low, in a tent, with temps in the 40s-50s and it was more than warm enough.

5Expert Score
Works at altitude.

Not much for temperature control as it only has a low and high setting so that is why i only offered 4 stars on that line. Very happy with the product and the best pricing i found was with amazon. I was concerned about the operation of the heater at out favorite campground west of fairplay colorado at about 10,000 feet…worked great to take the edge off for a few minutes while we got into sleeping bags and ready for bed. To much heat output to let it run all night with our cold weather bags. Very pleased with the heater and would purchase it again!

5Expert Score
Great for my tent

I had a big buddy and used it camping for several years in my tent. It worked great (and still does) but it was a bit of bohemoth to pack. I never used it on high or just for a second to heat the tent up quickly and then turn it off and run to my sleeping bag.
This size with the handle that folds down is the goldilocks size of tent heaters. I have a large tent so the little buddy didn’t cut it on cold fall nights, but this size is just right. Also it doesn’t take up the entire tent, let’s face it they are not really decorative.

5Expert Score
Very satisfied

Worked just as advertised. I’ve had for a year now and it keeps us warm on our screened in porch. The reason for my review, after a summer year stored in the basement it was not working as well as last winter the first time i fired it up this fall. Intermittent heat. Fyi – cotton swab in the injector and pc duster spray to clean out the dust and debris and it’s working like new.

5Expert Score

I purchased this propane heater to supplement the heat in my greenhouse in the fall. I have tried numerous electric heaters and they fail and do not produce enough heat! I have been using this for 2 weeks and you i am impressed. First off 4500 and 9000 watts is better than 1500 watts! A 15 pound tank will last around 60 hours on low or 20-24 hours on high. Add a box fan on low and i get a constant 15 to 20 degree hike over the external temperature. A great little unit that my flowers and fruit trees really love!

5Expert Score
Life-saver when you're camping in the cold!

I got this after a terrible experience with an unexpected temperature change when my wife and i were camping. We woke up so cold that our bones hurt. I immediately went out and bought this for our next trip. The first time we used it, i used propane canisters… Well, that is fine for about 2 hours or so, but they burn up pretty fast. I bought an attachment that allows me to hook it up to a large propane tank and that did it. We went camping for 3 nights and every night the temp dropped down into the 40’s… Well this thing kept us so toasty that i could have slept in my boxers and been just great. Just to be safe, we slightly unzipped the top of our tent for some extra airflow, but this is safe to have in an enclosed space. You will want a little air flow just so you don’t have to constantly breath the stanky propane fumes, but i can say that this was one of the most crucial buys i’ve ever made for camping when it’s cold. Without this, i don’t know that we’d have made it very well with the setup we had. I love this thing… I just highly recommend buying the adapter and having a large propane tank if you’re going to leave it on throughout the night or for any extended period of time, because the small propane tanks don’t last very long. Definitely would recommend this to anyone who needs some good heat. When it’s cranked all the way up, it’s so hot that you’ll be sweating… Find the sweet spot and you’ll be in heaven!

5Expert Score
Stay warm this winter!

Packs away very easily, small but puts out a ton of heat. Make sure to upgrade and get the hose extension to attach propane tank. The small bottles works great but last for 2 or 3 hr max.

5Expert Score
Mr heater

Love this heater super safe, by the way if you going to buy it, make sure you buy the carbon monoxide detector just in case , for safety purposes…

4Expert Score
Is it safe? Yes and no. Here are some tips. Heats up fast and hot

Last thanksgiving, my best friend and i went on our second overlanding trip near the sequoia national park, california. Temperatures had dipped to as low as a bone-chilling 27f, and water bottles froze while we slept in our cars. I was a bit more comfortable than him because the peter pan 100oz hot water bottle and 32f-rated sleeping bag kept me warm enough. We both were thankful, however, we did not bring our young kids or the struggle would have been more difficult to handle.

I looked into safe ways to keep warm a car, tent, or anything indoor, and researched the following options:
– car window insulation
– warm sleeping bag / rubber hot water bottle
– electric blanket
– fuel-based heater

insulating the car windows would provide an immediate boost to keep warmth from escaping, but that would have been impractical for tents. Warmer sleeping bags and hot water bottles are extremely safe options but would only help individuals that had them. Electric blankets could pose a small risk of fire or injury, require a lot of battery power to operate, and are not quite energy efficient. For warming a larger room or groups of people, i had decided on fuel-based heaters instead.

Are portable heaters safe?
There are two, immediate risks and concerns with fuel-based heaters:
– carbon monoxide (co) poisoning
– fire or burns when tipped over or flammable material accidentally touching the heating elements

are any safe for indoor use? Yes and no. They can be safe with the proper precautions and preparations. There always, always is a risk of fire and gas poisoning, but overwhelmingly, the mr. Heater buddy series was the most recommended appliance for indoor/outdoor use for a variety of reasons. Nonetheless, the mr. Heater is not 100% safe.

In a nutshell
the mr. Heater buddy series had been among the most-recommended, portable warmers rated for safe indoor and outdoor use. With proper preparations and precautions, that can certainly be the case even when no heater is 100% safe. Safety features like tip-over and low-oxygen sensors, along with a slightly open window and a separate carbon monoxide detector, can add to peace of mind while camping or staying in an enclosed space.

Our buddy mh9bx (f232000) model heated up very quickly with a standard 16oz/1 lb propane fuel canister and is rated to last between 3-6 hours. Longer runtimes can be achieved by attaching to a larger cylinder with an optional hose assembly. The fold-down carry handle can have a battery-operated stroller fan clipped on for more even heat distribution

as previously stated, no heater is 100% safe. For instance, the tip-over sensor may not activate in certain situations, the low-oxygen detector cannot read potentially deadly carbon monoxide (co) levels, and the grid cage is too wide apart to prevent smaller, flammable materials from slipping through and catching on fire. Furthermore, the lack of a built-in co alarm makes us strongly recommend bringing along 1 or 2 detectors (preferably with a fire alarm combo) to be on the safe side. Lower oxygen levels at elevations above 7,000′ may also render the heater from working. Mr. Heater buddy warms quickly and could sometimes get too hot even at the lowest level.

A heater provides much comfort and can even be life saving. However, we do not use our buddy continuously throughout the night as we prefer to only turn it on when somebody is awake and able to supervise. Call us paranoid, but we would rather be safe than sorry and owe our children our trust and protection. However you plan on using the heater, always keep safety in mind. With that said, mr. Heater had become a luxury we would not go camping without when temperatures could dip as low as 28f! Be safe and stay warm!

– can safely be used indoor when adequate airflow is provided and proper precautions have been made (see tips section)
— tip-over sensor to immediately stop fuel when the heater falls over (you can hear the switch activating)
— low-oxygen sensor
— grid cage to keep flammable material (or your kids’ hands) from touching the heating elements

caution: always leave a window or tent cracked open by at least 1′′ (4 square inches) to allow for adequate air flow. Keep flammable material away from the heater.

– heats up very quickly
— can get too hot even at the lowest setting
— outputs 4,000 – 9,000 btu
— suitable for up to 225 sq ft, according to the manufacturer
– dedicated slot for holding a fuel canister
— propane gas regulator swivels out to allow canister to screw on more easily
– uses standard 16oz/1 lb propane fuel canisters
— single tank can operate for 2.5 – 3 hours on maximum heat, the manufacturer claims, and up to 6 hours on minimum
— mr. Heater provided this burn rate: 0.044 gal/hr @ 4,000 btu and 0.099 gal/hr @ 9,000 btu
—- converts to: 5.632 oz/hr @ 4,000 btu and 12.672 oz/hr @ 9,000 btu
—– in other words, a 16oz canister can mathematically fuel for 2.84 hours on the lowest setting and 1.25 hrs at the highest
—– if my math is correct, that is half of the company’s run time claim. Maybe the provided burn rate is just a conservative estimate?
— owners on the internet had claimed 3-5 hours of continuous use from a single 16oz canister
—- i did not run mine long enough to verify their claims as i do not use the heater continuously (see tips section)
– can be connected to larger propane cylinders via an optional hose assembly
— mr. Heater strongly recommends their official 10′ hose assembly (#f273704)
– fold-down handle for carry or hanging

– no heater is 100% safe, mr. Heater included
— heat will always have a risk of fire. Burnt fuel will always come with a chance of carbon monoxide poisoning
– may provide false sense of safety despite multiple protection mechanisms
— tip-over sensor does not activate until past a certain angle. Could potentially leave heater running despite having tipped over
— example: heater falls over onto a mattress and remains propped up enough for the tip-over sensor not to shut off fuel
— grid cage designed to keep heating elements from being touched is spaced too wide apart
— piece of flammable material may potentially slip through and burn
— no built-in carbon monoxide (co) alarm
— co is odorless (cannot easily be smelled) and could unknowingly build up to deadly levels
—- tip: leave a window or tent cracked open by at least 1′′ (4 square inches) to allow for enough air circulation. Bring 1 or 2 reliable co detectors (ideally with fire alarm combo) and place them properly
— propane could leak through a faulty regulator or optional hose attachment
— low-oxygen sensor will not protect against co poisoning
— only detects low oxygen level and not how much co is in the air
– heater may shut off at altitudes over 7,000′ above sea due to lower oxygen levels at that elevation
– may not last all night on a single, 16oz/1 lb propane canister
– can get too hot even at the lowest setting
– bulky

it is absolutely important to take great care and proper precautions when using a fuel-burning heater. No heater is 100% safe.
– keep flammable material away from the heater
— i place mr. Heater on top of a raised platform, like a small table, to keep things away
— helps ensure the tip-over sensor shuts off the fuel if heater falls off. Note: heater is still hot when it trips over
— i had also bungee-corded the heater to one of the inside walls of a sturdy, plastic milk crate (open side facing up) that acted as an extra buffer against accidental kicks during sleep
– crack open the window or tent by at least 1′′ (4 square inches) to ensure enough oxygen flow inside
– carbon monoxide (co) is odorless and can silently kill you
— bring 1 or 2 reliable co detectors (ideally with fire alarm combo). Do not solely rely on the built-in low-oxygen sensor as it does not detect co
— use fresh batteries and test the alarm
— do not place them directly above or near the heater. I put one up on the tent ceiling and another in a side mesh pocket
— check for gas leaks along the connectors and hoses with a leak detector or soapy water (look for bubbles)
– if connecting buddy to a propane cylinder via an optional hose assembly, mr. Heater strongly recommends their official 10′ hose assembly (#f273704). No fuel filter is needed with it
— third party hoses could improperly allow residue to backflow and damage the heater over time. Be sure to use a fuel filter with them

myth: carbon monoxide heavier than air?
I had seen a few individuals claim that carbon monoxide (co) is heavier than air and that sleeping on the ground while camping may leave you exposed to the deadly gas sinking onto you. As much as that sounds reasonable, both the environmental protection agency (epa) and google nest state that co is actually “slightly lighter than air and diffuses evenly throughout the room.” in other words, co rises, spreads, and does not entirely drop onto the floor. Nonetheless, bring 1 or 2 reliable co detectors (ideally ones with a fire alarm combo) to be on the safe side.

We do not heat while sleeping
call us paranoid, especially my wife, despite having made all the safety precautions. There could always be a potential for something to go wrong while sleeping in confined spaces like a tent. As such, we generally do not leave the heater running while asleep. Here is what we do instead:
– turn on when we are ready to go to sleep. Makes the tent nice and toasty for the family, especially the kids
– before the last person goes to sleep, turn off mr. Heater
— we set an alarm in case that person accidentally fell asleep
– if it gets too cold again, turn on the heater for a few minutes until warm again, then shut off once more
– turn on when waking up so the family can get going to a nice and cozy tent

as you can see, we only activate the heater when somebody is actually awake and able to supervise. The steps may seem like a lot of work, but we rarely ever had to get up in the middle of the night to reheat. The procedure had worked well for us and for many others — even in 30f temperatures! The extra peace of mind makes for a much more enjoyable, worriless camping experience.

Mr. Heater models/sizes
the model reviewed in this write-up, mr. Heater buddy mh9bx (f232000), outputs 4,000-9,000 btu for 3-6 hours (according to the manufacturer) on a single 16oz/1 lb canister. It is good for a room up to 225 sq feet.

– mr. Heater little buddy (mh4b, f215100)
— burns at 3,800 btu for 5.6 hours from one (1) 16oz/1 lb canister. Good for a 96 sq ft room
— heats at 45-degree upward angle

– mr. Heater big buddy (mh18b, f274800)
— burns at 4,000-18,000 btu. Good for a 450 sq ft room
— 1.5-6 hours from one (1) 16oz/1 lb canister, 3-12 hours from two (2) 16oz canisters, or 50-220 hours from two (2) 20lb cylinders

4Expert Score
I like it!

My first mr. Heater buddy was stolen and i got through a few years without one but couldn’t take it anymore so purchased this one. I’m pretty active in garage, grandkids soccer games (in colorado) and some outdoor activity where it’s nice to have supplemental heat. My thoughts:
– definitely a luxury purchase!
– expensive to run and would help a lot to live in a state that doesn’t prevent you from refilling the small propane bottles as colorado does by requiring anti tip over valves on large bottles that effectively prevent refilling small bottles. You can buy an adapter to connect to larger tank which i do but too ungainly to drag to soccer games.
– i live at 5,000 ft and no problem with triggering oxygen sensor prematurely though i haven’t used it in very small space like a tent or camper.

4Expert Score
Cheaper at walmart

Day 1, fresh out of box, works ok. Then i went to get propane tanks at store as recommended by reviews that said propane from amazon was exponentially overpriced compared to most stores. Was so dissatisfied to see this model at wal-mart for $74.!

4Expert Score
Have extreme patience when using 10ft extension hose.

Heating small cabin. Bought the ten foot hose. As other reviews stated. Takes an entirely to get fuel to the heater. I litterly thought the product was broken. Took hours to get it going. Was on the verge of buying new parts. Holding down the plunger does not let fuel go through the line. I could get pilot light on,but when switching to hight or low flame would go out. Super frustrating. Needs a way to purge the air out of the line or some kind of way to bypass internal safety switch. Haven’t tried it with a little green bottle yet. After all that though it starts right up each time. Tons of heat. Would definitely recommend. Heats 8×12 cabin super quick even at 30 below zero f.

4Expert Score
Very nice portable heater!

This heater is really nice if you are going hiking or have to travel long distances carrying it. It only weighs about 8 pounds and its very compacked (can fit in a decent size hiking bag). The only thing that was an issue for me is when it came, the box was all beat up and when you slightly shake the heater it makes a lot of rattle. So if you take this huning make sure you don’t move it at all because the rattle is very loud. Other than that very solid product to keep you warm.

4Expert Score
Great heater

Works great.

4Expert Score
Great, but adapter for bigger tank

Got an adapter to hook it up to a bbq propane tank, you will suck up the little propane canisters quickly, but other than, can do a small garage, but like i said you’ll have to hook it up to a larger tank

4Expert Score
Good little heater

I liked how compact it was, but it didn’t give off as much heat as i’d hoped. It’s decent for a small space though. It went through the mini propane tanks fast and doesn’t have a hookup to use bigger tanks. I bought the bigger one of this type a few years ago and i like that one way better. The bigger one is also better built in my opinion.

4Expert Score
Awsome ltl heater

Purchased to have as a camping heater and a back up heater in case of winter worked great camping and even better in the house our average on low with a 1lb gas was about 3.5 to 4 hours on high it was about 2.5.we clipped a fan on the handle to blow across room and on low it takes about a hour to make a 12×14 room hot it takes about 2.5 hours to heat up a 14×22 room with starting temp at 60 ending temp being 75..had it in a 8×12 tent outised temp was 36 and on low it actually got to hot after about a hour..ordered the house and filter to attach to 20lb tank and on low it would last around 40 it was costing 16 to fill tank we would use 2 tanks a week..our power bill dropped 180 but the offset was a much warmer living space . I actually purchased the big green version after using this 1 for a few weeks. It puts out twice the heat but not as efficent. Im a sure the 2 of them on low would maintan a reasonable heat load to out 1800 foot home in a emergency

4Expert Score
It got hot

It makes heat like it should. What else you want from your heater, it didnt catch fire either!

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