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Rocket Stove Hot Tub - How I Made It
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- Опубліковано 27 січ 2019
- This is my version of a rocket stove hot tub ! Easy and cheap to make and very efficient. Perfect for winter evenings and mornings, good for the mind and soul ! Using rocket stove technology this hot tub uses very little wood and produces little smoke as well as producing great heat.
Cost to run: 0 euros (I use rain water and salvaged wood)
What I used:
- Bath tub: pressed metal enameled bath tub, very light to carry and I hope resistant over time. I found this tub at a second hand store for 20 euros. Plumbers could also be a good source as when they do renovations they usually through them out !
- Tub metal support: about 10 meters. I used square piping that I had left over from another project. I would recommend something strong as it has to support the structure plus the water plus the person. This was all welded together, it could also be bolted. You could also use wood as the structure is not in contact with the heat.
- Flexible chimney pipe: 9 euros. This is useful for the curve needed at the end of the tube. I added another piece of pipe I had at the end of that and secured it with a metal fencing rod so it can stand on its own. It is a good thing to make the chimney go up a few meters so you don't get any smoke and it also creates a good draft for the stove.
- insulating refractory bricks: I had these from another project. These are ultra light, heat resistant, insulating and perfect for the inner wall of the combustion chamber. They will allow higher temperatures in the combustion chamber and thus a more efficient burn. If you cannot find these you can always use normal refractory bricks or simple bricks.
- cement bricks: again I already had these, These are used to add an extra layer around the combustion chamber, to create the first part of the chimney under the tub and to create thermal mass so that once hot they will give back heat and thus the water stays hot for longer. You could use any type of material that creates a thermal mass for this part.
- wood feed: this is a old tin can, it is simply to give a form, around it I added cobb and bricks, so it is not a problem if the end near burn chamber burns though.
How it works / wood consumption:
- I use two empty fruit and veg boxes (these are thrown out in France after a single use!) and two thirds of one of these boxes filled with palette wood.
- I chose to make a rather large wood feed, combustion chamber and chimney under the tub as to heat that amount of water you need fairly powerful fire.As you can see in the video there is a metal grill at the bottom of the wood feed, this allows more air to arrive in the combustion chamber.
- The fire needs to be intense and constant. It takes about 15 to 20 minutes to heat the tub containing 110 to 120 liters of water.
- I get the water up to temperature and then no longer add wood to the stove. Thanks to the thermal mass the water stays hot for around one and a half hours ! But no longer adding wood to the fire there is no risk of over heating.
Skin protection from the heat given off by the base of the hot tub:
- Hard to see in the video but an essential part of the bath, are a few wooden planks to sit on when you are in the water as the base of the tub gets very hot and stays hot for some time !
Water:
- I use rain water, the next day I water the garden with the bath water !
Bath tub wood structure:
- This was made from palette wood
Cob:
- My "cement" was made from "cob", everything was done with this, it is absolutely amazing. I have a clayish soil in my garden, I used this mixed with straw and water. When cob dries it is extremely strong, good insulation and heat resistant. Though it needs to be protected from rain.
#rocketstovehottub #rocketstove #diy
My first time searching for "fired wood outdoor hot tub" and holy moly I stumbled
upon this and can't wait to build it!! Thank you for the awesome video and clear instructions
Thanks for watching :)
The thing about your videos is that you don’t have to hide anything with loud music. They are simply beautiful in every way, content and quality of them are so good. And I’m also learning and enjoying something. Thank you for these videos!
How very kind of you, thank you ! :)
Always interesting, creative and practical projects by which we can easily and cheaply make pleasurable "toys". Love your inventions!! Thanks
Thanks Amy ! :)
OMG...this iS such a very impressive project! Thanks for sharinG your EnchantinG lil idea with uS!😍🇨🇦🌻⚘⚘⚘
Thanks for your uplifting comment :)
Holy smokes - this fits my kitchen to hot tub project. Your design and presentation are intuitive, simple and just lovely. Thank you.
... roughly how long does it take to heat up? I might’ve missed this info... :|
Thanks so much. Have a look in the video description for details
Excelente me gusto muchísimo, lo intentaré en casa
Looks awesome well done!
thanks :)
Nice job, bit of work gone into that hot tub! Well done
Thank you !
Very creative, nice job!
Thank you so much Barbara
Brilliant video. Thanks for sharing ur experience from here Gaetan! Will def need to build one of these in the coming year! :)
Thanks Nitin ! Definitely need to make one !!! :)))
Wauw, great design and great video.
Thanks so much Alexander
this is how the romans did it to heat their spas. although the scale was much larger and the chimneys ran through the walls. the entire enclosure was very hot and they had a water source to keep things bearable. nice build
thanks
Very nice work mate. I am kind of jealous now :D
Thanks ! Make your own !
Well done!
Thanks !
This is fantastic
Thanks so much
this is awesome!!
thanks !
Ahh sweet winter
very nice!
thanks :)
very interesting! Thanks!
thanks
That is a great design for a wood fired hot tub. I have seen some others on UA-cam but this is quite unique and probably more efficient. Thanks for sharing.
Thank you !
It’s amazing how little fuel it uses!
Gaetan, this rocks! Of course! Once there is an old steel tub to use, the rest is nearly free. I'm sure others have done similar before. But once again, you show your gift of simple genius. Thanks for sharing it. Did you ever replicate your original rocket Oven? As you know, that one inspired me to build 5 different Ovens (so far). thanks!!
Lovely build. This is exactly what I had in mind for my build. Thank you very much. Lovely song as well, do you know the name of it?
I'm "stealing" this idea!
Nice build. Would you have done anything differently? Any cleanouts? Would you put a baffle in the middle under the tub? (longer channel for fire)
Thanks. I don't think I would change anything, as it works really well as is. Though I am sure this is always room for improvements !
What an amazing idea ! Open an air Bnb and i will be your first client my friend
:)))
Et t’as pas oublié la serviette de bain à la sortie ? ;)
Thank you for the video. I want to use your idea. My one concern is if the bottom gets too hot and you can risk burning your feet or other unmentionables?
Never mind I read the description. I was wondering how small rocks or some other non rotting material might be for a larger metal hot tub using your heating system
Hi, thanx for the cool video. i also built mine after seeing your video. I have problem with the plug/ water stopper and the water leaks, especially after the fire is on. I tried to seal with a oven silicon, but it was shir, now will try with wooden cone. What do you use for it? Looks like the normal one.
Thanks for your comment. Yes that was a concern of mine. I used bathroom silicon for the rubber plug, putting a good amount of silicon and putting a weight on top of the plug as it dried. The underneath part of the plug is of course in the chimney area. What I did hear was made like a protection inside the chimney so that the flame would not come into contact with the plug area. Using small bricks and cobb mix i made like a column under the plug area. My plug has never leaked... not yet ! So at the area of the column inside the chimney the heat and flames separate for a moment, this has not created any problems for the draft. Good luck
@@gaetanproductions yes good idea with the underneath protection. Thanx man
Thank you so much, I thought of this similar idea, and would be sure to find a build on youtube :) Awesome work my man! This is so perfect for my needs! I cant seem to find insulated refractory bricks though. It should work without them I hope. Anyone tried with something else?
Thanks for your comment. That is not a problem if you cannot find the insulated refractory bricks. Having the combustion chamber insulated is a plus for slightly higher temperatures, thus more wood gas is burnt and less wood is needed. The insulation keeps the heat in, instead of it moving out of the combustion chamber through the walls.
@@gaetanproductions Cool, thanks for answering. Bathtub is now been secured, it was easy to get it for free, very happy :) Before I start building, do you have any guidelines on the correct/optimal burn chamber size and channel, or does it not matter too much?
@@yvindmathiassen7617 you want the burn chamber to be fairly big as it there has to be considerable heat to heat that amount of water in a short time. You want the exhaust area/channel under the tub to be more or less the same surface area as the burn chamber so that what is created in the burn chamber can flow out easily. So that the air flow is not obstructed by a large volume going into a small volume. You will want maximum surface contact under the tub with the burn chamber and the exhaust channel. I am not at my home because of what is happening so I cannot give you the sizes I used. Good luck, please send a picture when you finish :)
@@gaetanproductions Cool, thanks for the info :) The surface area tip was a good one, I will work with that and adjust it for the sixe of the tub.
👍👍👍👍👍
just curious how your bathtub doesnt melt or burn
Don't fall asleep in there! May end up chicken soup!!! 🤣
How about a three part lid on top to prevent heat from escape.
When sharing a bath, the middle part can be a table.
A very good idea ! This being said it heats up so fast, about 20 minutes, for sure a lid would reduce this time
Brilliant 👏 👏 ❤
Thanks !
thats pretty awesome gaetan ... what about regulating the heat.. does it get too hot? or perhaps get to cold to quick?
Thanks Gary, it is very simple to operate once you get the hang of it. What I do is get the water nice and hot before getting in and I make it so that the right temperature corresponds to the end of the fire, so when I get in the tub the fire is more or less out. When I am in the water, if it is too hot, I add a bucket of cold water, this works perfectly, or instead of being completely submersed I put my legs and arms out of the water. As the burn chamber and chimney at the base of the tub are made of a lot of bricks, this acts as a thermal mass and continues heating the water even when the fire is out, water actually stays hot for a long time. Bath time can be as long as one and a half hours.
@@gaetanproductions very nice! again, great job... quite inspirational
I am not sure I would call that a "rocket stove", since there is no significant insulated heat riser to create a fast draw of air, but the design as whole makes sense, and seems like a good solution. Since you probably don't have the high heat of a true rocket stove, you are probably getting incomplete combustion (smoke). I would check for creosote build up over time on the bottom side of the tub.
Thanks for your comment ! Well actually, the burn chamber is made of insulated kiln bricks, once the burn chamber is hot there is very little smoke that comes out of the chimney and the draw is fenomenal. The efficiency of the system is in some way proof that the "rocket stove" design works well, that is it uses very little wood, gives off great heat and heats a large amount of water in a shot time. For sure the combustion is not complete !
@@gaetanproductions thanks I didn't get the fact that you insulated the burn Chamber from the video.
@@gaetanproductions also if you can really heat up the tub in 20 minutes that's great.
I have learnt that a low chimney has only the cooler air exit the contained space, while the height and draught are enough to continue to pull. It's about stalling the hottest gas in the area under the bath longer.
That is why you make ducts and loop it so more heat is imparted to the thermal mass instead of going up the chimney and exhausted. Choking it by slowing the air flow makes it less efficient and burn colder leaving more non-burnt material behind
Hi! Thank you for your video! Doesn't the steel tub get very hot? (I mean the metal itself..) Too hot to sit on it? Or the water balance the heat?
It does ! I put a piece of wood between the bottom of the tub an me.
Nice!
How long does it take to heat up the water, and isn't the bottom of the bathtub too hot to sit on?
Thanks ! It takes about 15 to 20 minutes for the water to get really hot. I sit on a piece of wood in the bath tub as not to burn myself !
Envy
👍
Лайк )👍🌈❤🌷🐞🐞
No warping or deformation of the tub from the heat?
Have you measured the temperature of the tub over the heat tube?
No deformation as the tub is full of water. Haven't measured the temperature in the water close to the bath tube that is in contact with the heat, though I know it is hot !
@@gaetanproductions Since you're French, you're probably an expert in making sauces. One of the secrets my Mother taught me to keep from burning the sauce is to use a double pot, so you can always try this method if you need a cushion between your body and the hot spot.
French Australian :) Good one, yes I put a piece of wood between the base of the tub and my body
Is the end where the flame hits not really really really hot?
it is ! but I sit at the opposite end, I use a plank of wood to protect me from that heat
How long does it take to heat? Thanks in advance!
20 to 30 minutes
Looks great. Just throw in some potato’s carrots onions and wait a couple of hours. Just saying
Ray Dreamer same thought.... people never tell you how the control the temps in this... and we’ve all seen ET and know that you can cook frogs alive slowly.
I wonder if you can add a water radiator to the side of your hot tub and switch hot flow from hot tub to radiator to control the heating while you are in there
How long to heat up the water to a nice hot soaking temp?
you will find your answer in the description under the video
Did you measure the heat of the water? How hot is it?
I didn't measure the temperature but it can either be too hot to sit in or not hot enough, you have to find the right moment to stop the fire
Did you use a cast iron tub or porcelain tub? Just curious
see video description for info
Doesn't the strip of the tub serving as the top of the exhaust get unbearably hot? I would think that the direct heat transfer from it would be too much.
That is the whole idea, it is good that it gets real hot, the water heats faster, using less wood. I mentioned in the description that an important part of having a bath in this hot tub is to have two wooden planks, one to sit on and the other for the feet, this will protect you from that hot spot. I use these until it cools down.
@@gaetanproductions Ah, I see. I didn't read the description but that makes a lot more sense.
What about the rubber plug?
protected it underneath the tub with bricks so it doesnt get direct heat from the flames
How did you regulate the water temperature?
if it is too hot you just add a bucket or so of cold water. Otherwise with experience I know when to stop adding wood in the burn chamber. Because or the thermal mass of the bricks underneath the tub, the water actually gets warmer after the fire is out and stays warm for a long time.
wow! how fast does it heat a tub?
15 to 20 minutes
PETRIOLO di Gaetano!!!!!!
ha ha ha !!! senza zolfo :))
How much about the water temperature can get to?
I have never measured the temperature, lets just say it gets very hot, it can get too hot ! I stop the fire when it gets too hot and may add cold water. The rocket stove system makes fast intense heat using little wood.
Thank you very much for your information
Great TUB - just don't fall asleep, your meat'll be falling off the bone by the time the bears find ya! :)
🤣🤣
You'll be cooked to perfection for the local grizzlies
Cannibals dream
ha ha ha
boiled eggs with boiled sausage
🤣🤣
The tub doesn’t get too hot to touch/sit in??? I can only imagine you burning your cheeks at some point. 😳
Also, over time, how has the tub handled the heat? Any warping/cracking in the tub or at joints/fittings???
It is hard to see in the video, though I did write it in the video description, I put some wood between the bath tub and me when I get in, to protect my behind.
The tub is holding out for now, I think the fact that there is water in the tub greatly helps this. No leaks, cracks or warping. Time will tell
@@gaetanproductions what kind of pump do you use to siphon the water out? thanks