When you buy through our links, we may earn a commission. Learn more.

Mr. Heater Little Buddy Reviewed & Tested For Camping 2024

What Is The Little Buddy Heater?

The Little Buddy propane heater, made by Mr. Heater, is one of the smallest portable propane heaters that is safe to use not only outdoors but indoors available.

It’s a radiant heater that sits on top of a 1 lb propane tank.

You light it with the press of a button and it’s perfect for heating small spaces or work areas.

Safety Warning: Always have a carbon monoxide alarm like this one (click to view on Amazon) and a RV Propane Detector (click to view on Amazon) nearby when using any indoor propane appliances.

I’ve used Mr. Heater Buddy Heaters in my travel trailer while camping a bunch of times and have been nothing but impressed with them.

They seem safer than other brands and I couldn’t wait to get my hands on the Little Buddy to see if it lived up to the hype.

I finally took the plunge and purchased one a couple of weeks ago.

The timing could not have been more perfect.

January closed in and even though I’m fairly far south, it still gets cold at night.

I often wake up in the morning inside a nearly freezing trailer with no electricity to run the RV furnace.

See Also: Portable Vevor Diesel Heater (All-In-One) Review & Setup

Mr. Heater Little Buddy Heater inside an RV
The Little Buddy propane heater uses no electricity and can be used inside an RV, van, or tent

In this review, I’m going to go over the specifics of the Little Buddy Heater and include some tips and tricks to get the most out of it while camping in cold weather.

I’ve been using it to keep the main room in my large 32 foot travel trailer warm for a while now.

So far I’ve been very impressed, but more on that later.

Mr. Heater Little Buddy Info

Mr. Heater Little Buddy

Mr. Heater F215100 MH4B Little Buddy 3800-BTU Indoor Safe Propane...

Check Price at Amazon

What’s In The Box

You get two things when you purchase the Little Buddy.

A small propane heater head and a plastic base you put a separately purchased 1 lb propane tank in.

One thing you may hear from the heater part when you pick it up is the sound of something small moving and clicking around inside.

You don’t need to worry, it’s just the knock over safety valve opening and closing as you move it.

See Also: Best Small Portable Propane Heater For Indoor & RV Use

There is a large plastic handle built onto the top you can use to carry it, even when it’s attached to a propane tank.

It comes in handy if the heater has been running and the metal burner area is hot.

Note: never carry the Little Buddy heater around while it’s running. It is very portable and easy to move around it’s just not designed to be burning while in motion.

Mr. Heater Little Buddy heater sitting next to a 1 lb propane tank and theh included base
The 1 lb propane tank sits in the included plastic base and the Little Buddy screw onto the top of the tank.

How To Set Up & Turn On The Little Buddy Heater

The small heater head screws onto the top of the propane tank easily and quickly.

Make sure the threads line up and it’s on tight enough to not have any leaks.

You don’t need to crank down on it but it does need to be fairly snug.

There is no tape or sealant required.

See Also: 6 Best Diesel Heaters For Campers, RVs & Vans

Once the head is on Mr. Heater recommends testing the connection with soapy water.

We have a TopTes portable gas leak detector (click to view on Amazon) we use to check the propane connections in our RV, it also works great for checking the Little Buddy .

To start the burner, you to press the red button on the side until the pilot light ignites.

Keep holding the button until the flame grows and starts to reach over and onto the edge of the ceramic burner face.

This can take around 30 seconds to a minute.

The buttons on the side of the Mr. Heater Little Buddy heater
To start the Little Buddy Heater press the red button until the pilot light ignites. Once ignited hold down the button until the light grows then release to ignite burner tile.

I found that it normally takes around 15 seconds at low elevations, but the wait time increases with elevation.

It can also start faster if it was used that day and kept connected to the propane tank.

It can be slightly difficult to hold down the button for that long.

But if you reach your hand so you are actually gripping the entire back of the small heater, it helps support your fingers.

See Also: Best Portable Electric Heated Blankets For Camping

Once the pilot light gets strong enough, you release the red button and the burner will ignite.

A big blue flame covers the burner tile and then slowly sink down to the gentle red of a radiant propane heater.

If it’s really cold outside, this process may take a little longer, which is normal.

Burner part of the Mr. Heater Little Buddy heater
It may take longer for the ceramic burner tile to turn red in colder weather or high altitudes.

How To Turn Off The Little Buddy Heater

Turning off this Mr. Heater Buddy is super simple. Just press the large black button on the side that says “off.”

It will immediately shut off the pilot light, which puts out the ceramic tile burner.

The small propane heater head is going to be hot, so be careful when moving it.

If you store it outdoors in a ventilated area, it’s ok to leave the 1 lb propane tank attached.

If you want to keep it indoors, you must detach the head from the tank.

You will need to wait a couple of minutes to let the parts cool down before you remove it from the tank.

Make sure the entire heater head has cooled properly before returning it to storage.

Little Buddy Heater Specs

The 1 lb propane tank slides into the included plastic base that has an opening of about 3 3/4 inches and is around 1 1/2 inches deep.

The outer base area is 7 3/4 inches in diameter.

I really like the base, but I wish it was a little wider and heavier to help balance the weight of the heater with the propane tank.

The Little Buddy heater when not attached to the propane tank is almost 11 inches tall and deep.

The widest point, which is the actual burner, is around 8 inches in total diameter.

Without the propane tank, it weighs 4 lbs. With a full 1 lb Coleman propane tank and the base, it weighs just about 6 lbs.

See Also: RecPro & Facon RV Tank Heat Pads Power Usage & Battery Draw

The heater is small and portable, but a little taller than I expected.

When on the tank, it’s 18 inches tall, which is about knee high to me.

There are no adjustable heat settings. It has a 3,800 Btu burner, that’s it.

It’s a small propane heater, so the non-adjustable heat to cut down on parts and size makes sense.

It is rated to heat spaces up to 95 square feet.

For a little portable propane heater, you can use in small spaces like a van, tent, RV, or even a hunting blind, it puts out the perfect amount of heat.

Radiant propane heaters are very efficient. They warm the objects around and not just the air.

If you point the Little Buddy heater in your direction, it’s going to keep you plenty warm, even in freezing temperatures.

As a reference, if you’ve ever used the popular Mr. Heater Buddy (click to view on Amazon) the lowest setting on that is 4,000 Btu.

I’ve used this exact heater in my camper many times and I’ve found the lowest setting to even be too warm once the RV heats up.

How Long Will The Little Buddy Heater Last?

Mr. Heater advertises the Little Buddy to be able to last for about 5 hours on 1 lb of propane. That’s a good estimate.

If you divide the Btu’s of the burner (3,800) with the Btu’s in 1 lb of propane (25,591) it comes to 5.7 hours of run time.

You will never be able to use up every bit of propane, but you can at least 5 hours out of each canister.

See Also: How To Stay Warm In An RV At Night Without Using The Furnace

At super low temperatures below 20°F, the propane is going to have a harder time getting out of the tank, which means the run time will be less than the estimated 5 hours.

I set a timer and ran the Little Buddy heater in my travel trailer one cold morning in temperatures that were around freezing and I found the 5 hours to be accurate.

Safety Features Of The Little Buddy

As I’ve said before, this is an outdoor and indoor propane heater, which means there are a few more safety features on it than you would find on a standard outdoor propane heater.

The Accidental Tip Over Shut Off

Even though it’s small, the Little Buddy has a knock over shut off valve that is standard with most Mr. Heater products.

It’s a fantastic feature to have on any portable propane heater, especially ones like the Little Buddy that sit on the floor.

I recommend testing this feature right away.

All you have to do is start the heater, let the ceramic tile heat up, then using the plastic handle on the back, slowly tilt the heater to the side.

It should shut off long before you have reached a 45° angle.

It’s not recommended to move the Little Buddy heater when it’s running, but if you do, the tip over shut off switch should engage from the movement and it will shut off.

Low Oxygen Sensor

There is also an automatic low oxygen shut off as well. This is a very good safety feature to have if you are planning on using it in a tent, car, or van.

It will stop the burner from eating up oxygen when levels get low.

This is also the reason this propane heater works best in elevations up to 7,000 feet.

Anything higher than that will usually engage the low oxygen sensor and the Buddy will not light.

See Also: RV Condensation And 14 Ways To Prevent Mold In Your Trailer

Never fully trust the low oxygen sensor on any propane heater. Using a propane heater in a none ventilated area can be fatal.

Make sure you always have good airflow in any space when using a propane heater.


You need to have at least 4 inches of ventilation from the lower floor area and roof/ceiling anytime you want to use the Little Buddy indoors (this includes tents and vehicles).

Proper ventilation will not only keep you safe, but it will also help the heater run better and hotter.

Safety Area

Proper clearance is also important for a small propane heater.

Mr. Heater recommends at least 30 inches of clearance from combustibles from the top of the heater.

Since the Little Buddy sits at around 18 inches tall, you need to add the 30 inches to that measurement.

It also requires 24 inches of clearance from the front and at least 6 inches on each side.

See Also: Best Heated Water Hoses For RV Campers, Barns & Livestock

There is no clearance required for the rear, which means you can place it against a wall.

These clearance measurements are really pretty minimal compared to larger portable propane heaters.

You can use the Little Buddy in smaller spaces than a normal propane heater, which makes it perfect for tents, vans, spacious vehicles, and even hunting blinds.

It’s absolutely perfect for campers and trailers, which is what we use ours for.

Other Safety Guidelines

You cannot use any Buddy heaters in moving vehicles. They must be stationary.

When using outdoors, the Little Buddy needs to be protected from strong winds because the burner will blow out.

It is also not waterproof.

If any parts get submerged in water, you need to get it inspected by a service technician to make sure none of the control systems were damaged.

Never transport the Little Buddy while it is lit.

Never leave it burning unattended or when you are going to sleep.

Be especially careful when using around pets or children.

See Also: Jackery Explorer 1000 Power Station Review (For RV/Camping)

Mr. Heater Little Buddy Heater inside an RV
The Little Buddy is perfect for keeping the main room in an RV nice and toasty.

My Camping Review Of The Mr. Heater Little Buddy

I’ve mainly used the Mr. Heater Little Buddy (click to view on Amazon) inside my RV, but I have tried it outside on chilly evenings.

Both experiences have been better than expected.

This small propane camping heater can really put out some cozy heat.

When using it inside my travel trailer, I’ve mainly had it pointing towards the slide out since that’s where I spend most of my indoor time working at a desk or reading in my Ikea chair.

So far it’s been able to heat the area I’m sitting in within 15 minutes.

After just a few hours, the entire main room of the RV has gotten warm enough to turn off the Little Buddy.

What I Like About the Little Buddy

Uses No Power

The number one reason I got the Little Buddy heater was electricity.

We mostly boondock/dry camp and get all of our power from solar panels.

In the winter months, even in the south, the sun is weaker, and it doesn’t stay in the sky as long, so electricity becomes a little scarce.

The RV furnace is the quickest way to heat a camper, but it uses a lot of power and propane.

Power is something we are normally low on in the morning before the sun has come up and gotten strong enough to charge our Jackery Explorer 1000 Plus (click to view on Amazon).

The Little Buddy heater uses no power, which is a huge pro for camping.

Diesel heaters are another type of heater that uses very little electricity. Check out my full review of the portable Vevor diesel heater here.

I can now wake up in the morning, start up the Little Buddy to heat the main room in the trailer, and start working at my laptop comfortably without having to worry about power usage.

It’s been really nice not having to bundle up to stay warm while waiting for the sun to come up.

As for the design compared to the other styles of Mr. Heater portable Buddy heaters, I like the angled heater head that points at me instead of the floor.

It helps heat the specific area I’m in faster, which is what I want it to do.

Budget-Friendly Heat Source With A Refillable 1 lb Propane Tank

According to NFPA (National Fire Protection Association) regulations, it’s not allowed to have propane tanks larger than 1 lb indoors.

That means the Little Buddy is one of the few indoor propane heaters you can use indoors legally.

The 1 lb propane tank is pro for the Little Buddy, because it makes it very portable and indoor safe.

But it’s also a con since 1 lb propane tanks run out fairly quickly and are hard to dispose of.

Luckily, there are a few ways around this issue.

Some people like to refill their disposable 1 lb propane tanks, but this is something I can’t recommend since it’s technically not legal and not very safe.

The valves on disposable 1 lb propane tanks like the ones made by Coleman (click to view on Amazon) aren’t made to be refilled.

There is no way they can guarantee that the refilled tank won’t leak.

See Also: Best Small RV Dehumidifiers That Help Prevent Mold

There is a 1 lb propane tank that is made to be refilled that is DOT compliant, making it legal for campers to transport and it works with the Little Buddy.

Refilling your own 1 lb tank with a 20 lb tank means you can get propane at the refill price, which is way cheaper.

In fact, it actually makes running our Little Buddy heater less expensive than using the portable electric heater we use on the rare occasion we stay at an RV park.

It’s called the Flame King Refillable 1 lb Propane Tank (click to view on Amazon).

You can get one with this kit that includes a 1 lb propane tank, a refill nozzle, and a metal stand.

The nozzle is the adapter that connects the 1 lb propane tank to a larger one.

The metal stand is used to place a 20 lb propane tank on upside down for easy refill.

Flame King Refillable 1LB Empty Propane Cylinder Tank with Refill Kit...

It’s eco-friendly, budget-friendly, and easy to use.

Mr. Heater Little Buddy Heater being carried by the handle
You can carry the Little Buddy heater by the handle when it’s not lit.


Another thing I like about the Little Buddy is how small it is.

The head is just so compact and easy to store when not in use (just make sure it’s fully cooled before putting it away).

I’ve been keeping it in a drawstring bag in a cabinet above the bed in our travel trailer.

Tent campers can set it in a tub or leave it in the tent when not in use.

I store the 1 lb propane tank outside when not in use.

The entire thing is really lightweight too. It can easily put it in a backpack to take on hunting or ice fishing trips.

1 Year Update

This is the second winter season we’ve been using our Mr. Heater Little Buddy (click to view on Amazon).

I’m happy to report that it’s still keeping our RV nice and warm.

We try to follow warm weather and stick to the southern states during the wintertime, but there are still mornings drop to freezing temperatures.

This little heater makes it easier to stay warm and not have to run the big propane RV heater as often.

None of the Mr. Heater propane heaters are supposed to perform well in high altitudes above 5,000 feet.

We used it in New Mexico this fall and it stayed lit and still kept us warm.

See Also: Portable Diesel Heater RV Storage Compartment Install

I’m still very impressed by this portable heater and I love how easy it is to find a storage spot for it during the warmer months when a heater isn’t necessary.

One thing we had to do was sand down the inner plastic tabs in the base.

They were stopping the propane tank from sitting in it fully, so it was a little unstable.

I think a good upgrade, if you mostly use the Little Buddy inside your RV, would be to drill holes in the base and bolt it to a board that’s wider and more stable.

Little Buddy Heater Pros & Cons


  • Lightweight
  • Small Enough For Tents, Vans, Truck Campers, RVs, Vehicles, Hunting Blinds, & Much More
  • Indoor & Outdoor Use
  • Heater Directs Heat Towards You
  • Small Size For Easy Storage
  • Runs For At Least 5 Hours On 1 Tank
  • Fast Turn Off Button
  • Tip Over Safety Switch
  • Automatic Low Oxygen Shut Off Sensor
  • Budget Friendly Heat Source When Used With Refillable 1 lb Propane Tank


  • Start Button Isn’t Easy To Hold Down For A Long Time
  • Not Good For High Elevations Over 7,000 Feet
  • May Sit Too Tall For Small Tents Or Cars With Low Roof
  • Only One Heat Setting
  • 1 lb Propane Tanks Will Need Refilling or Replacing Often In Cold Climates
  • Plastic Base Isn’t Very Sturdy

Other Mr. Heater Buddy Options

There are more portable propane heaters made by the Mr. Heater company.

They’re bigger than the Little Buddy, but have more features like adjustable heat levels and the ability to connect to larger propane tanks.

The Mr. Heater Buddy 4,000-9,000 BTU (click to view on Amazon) is a good medium size.

If you want something that’s really powerful there’s also the Mr. Heater Big Buddy 4,000-18,0000 BTU (click to view on Amazon).

Both of these can be mounted to a wall, which is a really nice feature for RV use.

See Also: Best Heated RV Sewer Hose Review For Winter RV Camping

Mr. Heater Little Buddy Heater sitting on the floor inside an RV
The Little Buddy heater is portable, small, and can be used both inside and outside.

Mr. Heater Little Buddy Frequently Asked Questions

Mr. Heater Little Buddy Won’t Light! How to troubleshoot your little buddy propane heater.

If it won’t light, there are a few things that could be wrong.

The most likely problem is that there is still some air in the gas line that needs to be purged.

You can do this by pressing and holding the ignite button for a few seconds to start the flow of propane.

The pilot could be blocked with something like dirt or spider webs.

See Also: Propane Tank Recertification: How & Where To Get Recertified

First, do a visual inspection with a flashlight.

If you see something in the gas tube, you can clean the pilot by removing the cover on the right side of the propane heater.

Clean the inside of the Little Buddy with a vacuum cleaner and no more than 30 psi of air.

To clean the pilot tube, use a soft pipe cleaner that won’t damage any of the parts.

Blow out any debris with low pressure air. If the pilot was the problem, the propane heater should now light.

If it won’t even spark, there may be a loose wire you can check for inside the unit.

How to use a little buddy heater with a 20 lb tank

Unlike the other Buddy heaters, the Little Buddy needs the 1 lb propane tank to stay upright.

If you want to use it with a 20 lb propane tank, you will need a Mr. Heater Approved Adapter Hose (click to view on Amazon) that can adapt from a 1 lb tank fitting to a 5 or 20 lbs tank fitting.

You should use the Mr. Heater brand hose specifically because it is made to not leak oil into your heater.

If you get a different brand of propane hose, you will also need to get a filter as well.

See Also: How To Install Solar Panel On RV Roof & Connect To Battery

You will also need to build a stand to keep the small propane heater upright.

A nice setup I’ve seen uses a 3 3/4 inch PVC pipe you can put in the included base and set the Little Buddy on top of it.

Then drill a hole in the side to fit the propane hose through and into the bottom of the heater.

No matter how you do it, make sure everything is secure. Also, remember that you aren’t supposed to use propane tanks larger than 1 lb indoors.

If you want to use this setup in your RV, make get a long enough hose to keep the 20 lbs propane tank outside.

How long will a Little Buddy heater run on a 20 lb tank?

A 20 lb or 5 gallon propane tank filled to the recommended 80% mark will have around 4 gallons of propane in it.

That’s 366,008 Btu’s in the tank.

The Little Buddy heater uses 3,800 Btu’s. If you divide that by the Btu’s in the 20 lb propane tank, you get 96.3.

That means you will get around 96 hours of run time from a 20 lb propane tank.

Little Buddy Heater, how long will the propane bottle last?

A 1 lb propane bottle will last around 5 hours with the Little Buddy heater.

How safe is Mr. Heater Little Buddy?

As far as propane heaters go, the Little Buddy is safe when the guidelines are followed.

It’s for indoor and outdoor use, which means it has more safety features like tip over shut off and a low oxygen sensor.

The most important rule to follow, other than making sure the connection between the heater and the propane tank is leak free, is to make sure you have proper ventilation.

Mr. Heater’s guidelines say there must be at least 4 inches of ventilation at the floor level and in the roof.

See Also: Best Propane Camping Stoves – From Small To Large

You also need to make sure there is at least 30 inches of space from the top, 24 inches from the front, and at least 6 inches on each side.

There is no need to have open space in the back. You can set the Little Buddy against a wall but make sure you use common sense.

It’s never safe to have a flame heater near anything remotely flammable.

Never leave it running unattended or at night while you sleep. Always keep a close eye on it around pets and children.

Have any more questions about the Mr. Heater Little Buddy? Leave a comment below.

by Jenni
Jenni grew up in a small town in Idaho. With a family that loves camping, she has been towing trailers since a very young age.

11 thoughts on “Mr. Heater Little Buddy Reviewed & Tested For Camping 2024”

  1. The longest Mr. Heater hose I could find was 12′. If I connected a different brand onto the 12′ Mr. Heater adapter hose assembly, would I need to buy a filter, or will the one in the Mr. Heater hose work for both. Also, there is a Dynaglow Infrared heater that attaches directly onto a 20# tank. Since Mr. Heater has a 5′ hose, couldn’t I just buy an adapter, skip the hose, and put the Little Buddy directly onto the 20#, just like the Dynaglow? I know it’s illegal, but Dynaglow gets away with it. I was just wondering if it was even possible.

    • Hi Joanne,

      I would get a filter just to be safe if you are going to be connecting a different brand of hose to any Mr. Heater products.

      As for connecting the Little Buddy Directly to a #20 tank with just an adapter, I can’t really give a solid yes or a no to that. It’s not something I would do. It’s much safer to build a stand for the Little Buddy and have a hose connected so you can keep the #20 tank outside.

      You can also get refillable 1 lb propane tanks that can legally be filled up using a larger tank. I think that’s probably the safest way to go.

  2. Really helpful and concise information. Thank you so much. I just bought the little buddy for my 24′ motor home and this was right on point!

  3. I like the heater but wish it had a temperature setting or the pilot would just stay lit sometimes that is enough heat by itself. Also it needs a sturdier base the propane sits in it, but it is top heavy for the base so be careful or weight the base down to prevent tipping.

    • I totally agree, more than one heat setting would help a lot.

      I also am not a fan of the base. We ended up sanding down the inner plastic tabs on it so the propane tank would fit better.

      I’m considering drilling holes in it and bolting it to a piece of plywood to make it more stable this winter.

  4. What am I doing WRONG!!!! I have lived in my Van now for 3 months….5th time I have taken this thing back to the place I bought it from(exchanged 3 times) and I’m STILL having the same PROBLEM!!!! It will give me heat for maybe 3 days in a row, then go and try and light it again when I wake up in early morning, the pilot light WILL NOT LIGHT AGAIN!!!!!!! Since this has been a regular problem, I’ve been wrapping the device in a heavy blanket, then wrapping the bottle with another blanket… seemed to be doing the trick….for the past 3 days…
    buuuut, I go to light it this early am, WILL NOT LIGHT!!!! Now I’m completely FREEZING AGAIN in my van!!!!

    • Hi Jodell,

      Sorry to hear about your propane heater. How full is the propane tank when the heater won’t light? Propane contracts when it’s cold. Sometimes if it’s cold and the tank is low on propane it won’t have enough pressure to get to the heater and light.

      Does the heater work when it’s cold and you use a full propane tank? You may need to save the full bottles for when it’s cold and use the almost empty bottles when it’s a little warmer in your van.

  5. This heater is garbage. I had the same problems as Jodell from the first use. It lit ONCE to test and ran 3 minutes. But it never lit again. I’m at 5000 foot elevation and it was 35 degrees. Won’t light at all. So infuriating. I’m returning this trash.


Leave a Comment