How to Make a Survival Stove (Car Heater)
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With winter coming soon for many of us who live in the colder climates, getting stranded in your car can become a dangerous possibility. As a result, everyone’s emergency car kit should contain the ability to heat your car if you were stranded or holed up waiting the passage of a winter storm.
Even if running your engine is an option, you may need to conserve fuel for the return trip. Also, carbon monoxide can build up inside a standing vehicle while the engine is running, even if the exhaust pipe is clear. In this article, I will be demonstrating how you can make your own survival heater for your car that is cheap, safe to use, and easy to construct.
What You’ll Need
- A small empty metal can: You want this to be slightly taller but thinner than a standard roll of toilet paper. My can of choice is an unused 1 quart aluminum paint can found in most hardware stores. You can also use an empty food can that fits this description.
- A larger metal can that can easily accommodate the first one: I use a 1 gallon unused paint can (again found in most hardware stores). Another option is a coffee can, metal bucket and so on.
- Some type of lid that can be placed over the larger can: I also like to get a lid for the smaller can for which I will explain later.
- Toilet paper (unscented)
- Six bottles of 70 to 91% isopropyl alcohol (rubbing alcohol)
- Matches or some other fire starter
How to Put it All Together
Prepare the toilet paper: The first step is to take out the central cardboard tube from the toilet paper roll, leaving only the paper behind. - Squeeze the paper into the smaller can: Next you’ll want to squeeze and roll the paper into the smaller can. If the can is so small that a full-size paper roll has no chance of fitting inside it, then you can remove some of the external sheets (just like you would if you were going to the bathroom) until it does squeeze into the can. It’s important that it fills up the entire volume of the can.
- Add the fuel: If you are now ready to use it, simply add the alcohol until the toilet roll inside the can is completely saturated. One of the benefits of using a 1 quart unused paint can is that you can store the stove with the fuel already added by placing the air-tight lid over the can. This saves space and allows you to have more fuel available. The lid can also be used to control the output of the flame which I will explain below.
Place the smaller can into the larger one and position it in your car: The larger can provides an insulating barrier and some protection for passengers and your car. You’ll also want to position it in a place that’s far enough from anything combustible. Use the palm check. Put the back of your hand against the surface you’re worried about and if you can’t keep your hand there without burning it then it’s either to close or you’ll need to adjust the flame.- Light the stove: First, open the window just a crack to provide some airflow and then carefully place a match (or throw some sparks using a firesteel) onto the saturated toilet paper and viola! you’ve got yourself a burning stove. Use caution in lighting as it will combust very quickly. It’s best to partially cover the smaller can with a lid to decrease the size of combustion (you can always increase it later (see next section).
Controlling the Burn Rate
You may notice if you follow the steps above, that a pretty sizable flame results from having the smaller can’s opening completely exposed. While this is fine if you want to warm up faster, it does tend to go through the fuel fairly quickly and is not so efficient. A better way is to partially cover the smaller can with a lid. Or if you used a 1 quart paint can, you can make a small hole (about the size of a quarter) in the lid it comes with and place that on top of the can. Both of these methods control the burn rate and allow the stove to provide a constant heat.
Another option is instead of completely saturating the toilet roll (as indicated in step 3 above) you can pour just a few ounces of alcohol on the paper and regularly add more as it burns out. This will also control the size of the flame and conserve fuel. I prefer to use the lid method over this one since you don’t have to regularly add alcohol (it’s nice to sleep for a stretch of time and not have to regularly add fuel).
A Word on Carbon Monoxide
I’m sure by now many of you are thinking, “What about the dangers of carbon monoxide?”
Carbon monoxide is produced from the partial oxidation of carbon-containing compounds. “Partial oxidation” is just a big word for what happens when combustion (fire) takes place in an area where there isn’t much oxygen. This is most apparent when one operates a generator inside a home or if their wood stove is improperly vented.
In the case of this alcohol stove, while there is risk of carbon monoxide emissions (rubbing alcohol contains carbon: C3H7OH) the risk is very minimal. Opening your window slightly should provide sufficient oxygen for a clean burn.
If you still are concerned about it, I would recommend purchasing a battery-operated carbon monoxide alarm and turning it on (putting in the batteries) when running the stove. This will provide you ample warning should there be an issue.
Video Instructions
You can also watch the full instructions via Youtube:
- Posted in Featured, Preparedness, Video
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I am curious if denatured ethyl alcohol would be usable for this application.
http://en.wikipedia.org/wiki/Denatured_alcohol
The 10% methanol makes me suspicious as to its safety. I see that pure methanol fumes are definitely toxic, but the fact that it burns completely cleanly without that nasty watery residue left by the diluted isopropyl makes it somewhat more attractive as a fuel.
With the 70 percent isopropyl, it seems like after refilling it a few times it would become saturated with the watery residue.
It’s too bad that they don’t sell pure non toxic alcohol.
Steven,
You are absolutely right in that denatured alcohol burns cleaner but like you I’m not sure I’d trust it in an enclosed space. 90% isopropyl is probably the purest alcohol you’ll find (and the one that I recommend in this application) that is relatively safe to burn in a small space. I wonder how grain alcohol (homemade ethanol) would fare in this type of situation. You can make it very pure.
Erich, I thoroughly enjoyed this video! I truly didn’t think that roll of toilet paper would fit in that little can! If I were to store these ingredients in my car, would they all fit in the larger paint can? I’m thinking of putting the toilet paper in the smaller can and then storing that can and a couple of bottles of alcohol in the larger can? Do you think everything would fit?
Great video!
Lisa
Lisa,
First of all, thanks for the comments. The large can will accommodate the smaller can (with toilet paper already inside and filled up with alcohol) as well as another bottle of alcohol and another roll of toilet paper.
However, I would recommend you storing at least a half-dozen more bottles in the car (which is completely safe). They should fit in a small area inside your trunk.
Hey there, great video and description of this neat item!
I have a question regarding fuel…methyl hydrate burns quite nicely, what are the pros/cons comparing isopropyl to hydrate??
Regards,
Tom
Hey Tom,
Sorry for the late response. Methyl Hydrate (Methanol) is a great stove fuel, it burns super clean and is great for camping applications, however due to the toxicity of the fumes I’m not sure it would be ideal in this type of situation (enclosed area etc.)
The bummer of isopropyl alcohol is the sooty residue and left-over water (although the 90% isopropyl is not so bad), but again, in this type of situation it may be ideal due to the less toxic nature of the fumes.
- Erich
Hey Erich, thanks for the insight, I may switch from isopropyl and Methyl as the situation dictates..ie…in a ground blind….with good exchange of air….using Methyl, and more inclosed areas…isopropyl. Good to have a choice of fuels it seems.
Do you have a preferance to the many tissue rolls available???
I’m thinking the roll closest to a cotton ball the better wick??? What is your thought?
I’m definately in the process of gearing up a heater asap.
……Tom
Tom,
I’m not sure which roll would be best. I’ve only used what’s available at my house (which seems fairly soft but not super soft). I also would stay away from the scented rolls.
As far as which is best, you’ll have to experiment with that one. If you notice a substantial time difference or heat output difference according to roll type used, definitely let us know!
- Erich
I’ve heard that the 70% alcohal would burn so that the flame would be visable much better than the 90%. Seems like a good safety factor. Have you found this to be true?
Hey Ryan,
I agree that the 90% alcohol flame is less noticeable than the 70%. Despite that, I still prefer the cleaner-burning of the 90% with its accompanying less water that is left over and longer burning times.
Erich, i have “disfigured” 2 quart sized paint cans just trying to tap the lid on tightly so that i can store this in the gallon can. The lid just won’t seat into place properly. Any suggestions?
Thanks!!
Michael,
I’m confused, what’s blocking it, the toilet paper?
i don’t think it is the toilet paper. the lids rest in the circle ring that is in the top of the can, but when i press it down further, it won’t stay. i can lift it back out with my finger nail. i did this with 2 new paint cans from ACE. maybe i should go to a diff store.
Michael,
I’d hate to have you pull out all the paper again after all that work. But if it closes without the paper in it than it’s got to be the paper otherwise it’s the container. In that case, yes, you should get a new one. I got mine at Lowes if you have that available to you.
Thanks Erich,
actually i have not tried to close the can with the lid w/o the paper in it yet…but from the looks of it, that won’t work either. i think the can/lid combo is just cheap.
Erich, I just got through putting the heater together using the 1 gallon paint can and the 1 quart paint can I purchased from lowes. I choise to put a quarter size whole in the middle of the quart lid. I used 70% alcohol for fuel. I emptied 1 16 oz bottle of fuel in the quart can and place it in the gallon can and ignited it. It burned fine for a couple of minutes then went out. Should I add more alcohol in it? Also if I get the heater working alright I thought I would drill some holes around the top of the gallon can to let air in, and use a piece of wire cage screening to lay on top of the gallon can so I could place a pan on top of it and cook with it.
Ray,
First off, are you sure the toilet paper is completely saturated? If so, then it sounds like the hole in the lid is a bit small for that alchohol type. When I’ve used the small hole I had 90% Isopropyl with no problems. However, when I refilled with 70% it would not stay lit. So instead I just slid the lid slightly off center of the smaller can and the burn would come out the exposed side. This seemed to fix the issue while minimizing the flame size.
Give it a try and let us know how it works out…
The wire cage idea sounds great. That stove definitely puts out enough heat to work as a cook stove as well. Good luck!
- Erich
Erick
I will try using 90% alcohol. Also maybe the tolet paper I used is to compressed. I used one ply tolet paper. Could it be that maybe there needs to be some minute air space in the roll of paper so the alcohol can cirulate more easierly through the paper. I will try using 2 ply enstead.
Ray,
That’s a good point with one ply. Whatever material you end up using to fill the quart size can needs to be able to produce the capillary action required for a continual burn. It’s possible that the one ply doesn’t provide that. For my stove I used double ply. Either way, I’d like to hear your results.
I’ve also been thinking that a cotton t-shirt stuffed in the can would also be effective since cotton cloth is an excellent wick — again due to the capillary action that the material provides. I need to try that out with an old t-shirt to see how it works.
I made a heater using a 28 oz tomato can, 1000 1-ply roll of toilet paper, and 91% alcohol. The paper was fitted in very tightly…I actually had to use the heal of my shoe to get it in well. I used almost 3/4 of a 32 oz bottle of alcohol but it took quite a while for it to soak it up as the paper fit so tightly. We lit it and it burned very well for several minutes with a full flame before we put it out. We lit it again and it still burned well for a longer period of time even without adding more alcohol before the second lighting. I’m sure it would have burned as long as we wanted. It never diminished or acted like it was going to go out. We’re pleased.
That’s great Karen! Nice to hear you had success with it.
Erick
I tryed using 2 ply tolet paper to see if it would make a difference with 70% alcohol. It didn’t, but with 91 % alcohol it worked very well. The hole in my quart size can is about the size of a haft dollar. In using the heater for a cooking stove I used a separate gallon can and made several quarter size holes around the top of the can so there would be enough ventilation to keep the burner going. I placed a pan of water on top of it to see if it would heat up the water. The flame was not large enough to do it so I took the lid off the the quart size can. That increased the flame quite abit, but I ran into a problem when I tryed to extinguish the flame. I couldn’t extinguish the normal way using the lid because I had the ventilation holes in it. The only way to extinguish it is to use a larger container to cover the gallon can. If you are using the heater to cook with, it probaly would be best to use it only out side of the car. because the flame would be to differcult to control. I am going to keep the heater inside of my car along with several containers of of fuel for an emergency. Thank you
You should probably mention somewhere here that this heater is not for regular use, as the rising emissions will blacken anything above it (i.e. the roof of your car, if using this as a car heater). This is great for emergencies if you’re freezing, but I wouldn’t use it if you just get tired driving in the middle of the night and decide to pull over for a quick nap. Obviously you meant this as an emergency-only tool, but I think people may try to use it for more than that if you don’t specify the down-sides.
Hey CJ,
Thanks for the comments and advice. I agree that it should be used only in emergencies. I did mention this is a survival stove and should be part of your emergency car kit so I assumed people would understand that.
As for the emissions, in my testing of the stove (see my Testing Out the Survival Stove and Carbon Monoxide Testing Result articles) I did not get any blackening of my roof. My interior roof is a light (almost white) grey cloth and after both those tests (about an hour of running the stove) no blackening occurred. It may be due to clean burn of the 90% isopropyl alchohol.
Definitely test it out for yourself and let me know your results. I love hearing other people’s experience with this stove.
All in all, it is a very clean-burning stove that is a very effective heater for your car. It does take a bit of practice to ensure that you run this stove safely so I should probably stress the importance of testing it out before the emergency.
The first heater I made worked perfectly. On the second one I spilled a little of the alcohol in the large outer can and when I lit the heater, the large can did smoke and the fire kinda spread out to the larger can to burn off the spilled part. SO MAKE SURE the alcohol stays just in the smaller can with the toilet paper and it will work like it’s supposed to with no smoke.
Good advice Karen. Thanks for the comments.
Hi,
Do you really need the toilet paper? Couldn’t the inner can just contain the alcohol?
Thanks.
I was wondering how much heat this heater would put out because I am looking for ways to heat a 15o foot room to a temperature of about 70 degrees. Will this heater provide the heat required or am I just asking for problems?
Gordy,
I’m not sure of the exact BTUs this stove puts out. And for a 15 square foot (I assume) room it really depends on the outside temperature and internal room temperature as well as insolation
The best thing to do would be to try it out and see if it works for you. Besides that , there are a number of stoves ( like indoor propane stoves) that would be more economical over the long term.
A few years ago my hubby bought us each a Coleman SportCat PerfectTemp Catalytic Heater. They are fantastic! I’m still on th first cylinder. They put out 1,500 BTU’s,Burn for up to 14 hrs. We keep them assembled. Need only a match or lighter to ignite. Worth the money in our books..
Thanks Debra,
I’ll check that one out.
This works well with cheap vodka too.
Excellent point Billy. Thanks for the comments.
ok i have to ask..where do you sit this in your car??? in the seat?? won’t it get to hot?? in the floorboard?? what about the dash??
sharlotte,
Yeah I put mine on the seat on top of a thick fabric (sort of like a towel). You can see my testing of it here: http://www.tacticalintelligence.net/blog/testing-out-the-survival-stove.htm
and CO testing here: http://www.tacticalintelligence.net/blog/survival-car-heater-carbon-monoxide-testing-results.htm
I recommend including a pot holder or old oven mitt in the kit.
I keep my small can separate w/other stuff in it till use. Large paint can holds 24 oz mason jar w/alcohol CLEARLY MARKED. Room for 2 frozen plastic H20 bottles (must be short enough or 2 empty alcohol btls filled and frozen and clearly marked H20. If they melt they are sealed in large can till ready no leaks. Before starting fire in can, cut and peel water bottles and place ice in can around small can. Melts ice for little dirty water to drink and keeps a safe fire with water in bottom of can. A second large can can old 4 bottles of ice (H20) bottles and serve as a bathroom or snow dipper.
In regards to Billy’s comment on use of cheap vodka… I wouldn’t recommend the carry of drinking alcohol in your car due to legal issues with open container laws. I would at least recommend you keep it in an old rubbing alcohol container to avoid a nosy cop busting you…
Good point.
After reading all about flames and fumes and storing flammable fuels, I think I’ll stick with what I do now, which is to keep a couple of packages of Thermacare heat wraps in the car. With those plus a sleeping bag, you’re toasty for a couple of days.
While this is a great idea, I can think of a few better ways to use toilet paper out in the field if u know wat i mean. A solutition to this is to store the toilet paper without the alcohol and add it all when you need to use it.
You are so interesting! I don’t believe I have read anything like that before. So good to discover another person with some original thoughts on this subject. Really.. many thanks for starting this up. This website is one thing that is needed on the web, someone with some originality!
why not just fix up the smaller can and fill it with alcohol, then put the small lid on the can? that would eliminate the need to store one extra bottle of alcohol…this is basically just a homemade sterno type heater. I wonder if the alcohol fuel could be gelled with and used with out the toilet paper. like sterno type fuels…
I’ve used this type stove on deer hunts, no smoke no odor, be careful since alcohol burns clear and the flame is hard to see.