You should stretch out the coil slightly and mount it inside a wire tube so the clay is not in contact with the copper tube. If there’s a slight space between the coils it should be more effective. You can even incorporate it in the side walls of the fire pit as well the lower it is the better. You should make a damper to slow down the burn. It burns too fast so you use more fuel. That would also be good for a home made hot tub in the yard. In summer I do all my cooking on one make of recycled bricks.
Thanks for the damper tip. I need to learn about methods in that a little more, but I understand the concept. I do another coil in a bigger rocket stove, that is open inside the riser. Works better. I’m impressed that you do all your cooking on an rocket stove! Awesome!
Another possibility is to wrap the copper tubing loosely around a short piece of PVC pipe of the desired diameter for the coil like 6 inch perhaps. This should keep it from kinking at all, although I've never tried it.
Nice proof of concept project. Okay for short term. Exposing that copper coil to the extreme heat will burn it rather quickly. You are spot on about cobb's versatility. If there is a fail, break it up , re-hydrate and use again. Wonderful.
Thanks for the feedback. I throw an audio track in when I need to. If my high-speed video goes over 1000%, the audio drops out of the render. So, I cover those spots with music. Plus, some sections just feel like they need a jam. :-) Thanks for watching.
@@GreenShortzDIY I do agree with Worthless Professor on this, I'd rather hear ambient sounds than a soundtrack. I realize many(not you) think they are making hollywood blockbusters rather than sharing the knowledge they have gained over a lifetime of experience. Which often comes with many failures and some great successes. Rather than the music some feel compelled to add I personally would rather hear the"oh sh** i screwed that up and i need to redo all this part" I'm a hands on guy who learns from others mistakes as well, at least when they share them. Not sure why people feel compelled to remove the not quite perfect projects. I've never started a youtube channel even though I've been making projects since i was a youngster, and that would be about 50 years ago (smiling face inserted here) keep up your great work, i enjoy it greatly. thanks again, halfnuts.
To prevent kinks in your copper pipe you could try bending it around a piece of schedule 40 pvc or other pipe in the size that you want the coil to be. The trick is to keep the copper pipe close to the pipe used for the shaping and bend it a little at a time. It makes a perfect uniform coil without kinks if done right.
Or use a steel ‘spring’ that fits over the copper pipe. We used to sell one designed for this purpose at a plumbing supply I worked at. It’s coils are too tight to be a spring but it creates a bendable but circular pressure evenly over the copper. Quicker and easier than filling a length of copper. Move it along the pipe as you make each bend
TY! Been wondering. Why is the riser section necessary? Why can't you go straight from the burn chamber into the Mass/water material then out the flue?
In my experience, the riser is needed to create the draw. But, there is likely a way to get more heat to the water, faster. This was a fun experiment. Thank you for watching.
Tom a couple questions. How long did it take to heat the 5 gallons of water and how much fuel was used to get it hot? Great design really like the concept. it got me thinking of making one of my own.
Hi Rick. I don’t think I got the whole bucket heated during this test. Although, it might have all been warm if I mixed it. I also really didn’t measure my fuel...I was under the gun to get it done. When I do part two, I’ll be more scientific...have a thermometer on hand, have all my fuel ready for a visual and most importantly, no leaky bucket. Thanks for watching and for the encouragement.
Thank you for the video, i'm facinated by rocket and similar wood-burning stoves. I am particularly attracted to the heat efficiency and low-pollution achievable which I understand comes from having a very high temperature extended chimney above the fire to complete the burn. Having a pipe for water heating is attractive but being so close to the inside of the chimney, I think this must negate the high temp chimney objective. I presume this why we often see a cover over the chimney, forcing the exhaust back down and exhausting at the base. The area between the chimney and the cover is the area where heat could be harvested with the coil to heat water, without risking the "hot chimney" principle. Any thoughts - have you tried this sort of design ?
Rhian Taylor Hi Rhian. I think what you are talking about is called a rocket mass heater. It’s related to a rocket stove, but usually has a taller chimney and a barrel or some over the top to provide complete combustion while forcing the warm exhaust through a “mass” to absorb the heat and radiate into a living space. The complete combustion relies partly on a very hot riser. It’s sort of the nozzle of the rocket. I do want to eventually make one of these, but I’m still in the learning phase. Paul Wheaton is a guru on the subject. You might enjoy some of his videos. Thanks for watching.
@ Rhian Please check out Audiobro for a great rocket mass heater and cooking stove with optional hot water heater. he offers plans for the two versions with personal help if needed.
Love this build! would be interesting to see the difference between having a coil or just heating a boiler over the flame and letting that thermo-siphon into another container instead.
Thank you, John. I think a pot on the top would have been more efficient, or gathered more heat. Of course, I wanted to try the coil. :-) Thank you for watching.
so the water makes the cycle itself? i assume because hot water wants to raise up, it automatically goes into the bucket itself? replacing itself with new cold water from below? i keep seeing this type of water heating from a stove but in none of the videos it explains how it works,
Incredible.....just want to be off grid so bad when I watch stuff like this. Thanks so much for informing us all how easy it can be with DIY projects my friend. I love the color of the red clay can a person buy it if they don't have access to this type of clay?
When you say you put the hose up the coil on the inside, what is keeping the hose from melting inside? Please help me to understand that particular step of the process please. I'm a first timer. Thanks Enjoyed the video!!!
Great project. The only thing you needed to do was change up the hosing. The top hose in your cob stove needs to go to the bottom of your bucket so that the convection heat can continue to rise and then run your top hose from your bucket into your cold water intake in the oven. We did this in alternative energy in college with a solar panel.
Interesting watching the cob being made! I Made a cement copper coil stove recently too. I also used 3/8 pipe but roughly 3x more. I found that it burnt so much better when I slipped in my flu extension. And it got much hotter. So far I've used it to heat 200l of water with success.
@@calmauric8218 im asking cz im trying to build a greenhouse with this method to heat up the gh and to make sure that theobroma cacao has 23/25 C temperature all the year. Did you actually know if this method with heating the water cloud help me to do this? (I'll heat up approx 300lt of water in the cold night)
@@flamel397 ok. Look into "rocket mass heater" several people have successfully heated a greenhouse bed in Sub zero temperature. It's like a rocket stove. But even better
Was there a pun? 😂 Actually, all puns on this channel are fully and painfully intended. If you knew my father’s humor, you’d understand I had no chance. 😳 Thanks for the laugh and for watching.
You wasted so much hot gases and energy from short chimney, you must utilize chimney design either make it longer and longer copper coil or add extra heat absorbing material to the chimney.
Su, you are right. I was surprised how short the coil was for a 10 foot piece of copper. This was an experiment, of course, but if I made this again, it would have a much longer cool and taller chimney. Thanks for the feedback and thanks for watching.
i thought it seemed like waste of energy too and it slipt my mind that instead of copper coil we could use some kind of water container right on the fire instead, sealed with input/output to larger container somewhere making use of " thermal siphon"??
I'm thinking of using something like this with a water pump to go with my pool. How could you capture more of that heat? Most of your heat is leaving through the top, is there a reasonable way to capture a lot more of it? Is it just to make the copper tubing longer?
Hi Joseph. Yes, this definitely lost a lot of the heat. I think you could add a second boiler pot to the top. Or just make a much longer coil. Thanks for watching.
Loved the muddy feet part! Can you put a written explanation of the dynamics of this here? I don't understand how it is working. Also, is the rubber going to melt or dry out if it gets too hot?
I could not tell in the video if you covered the copper coil with cob. Can the copper be exposed to the fire? I plan on making one of these but thought that the copper would melt if it was not covered
Hi Porter. The copper coil is exposed on the inside. I think that as long as the coil stays full of water, it won’t melt as the water will pull the heat through the copper fast enough. I’ve actually boiled water in a styrofoam cup sitting directly in a fire. The water is a much better conductor and pulls the heat though the foam faster than it can melt. I’m working on another coil water heaters today. It will be fully exposed to flame in a rocket stove. Let’s see how it does. :-) Thanks for watching.
If you can do anything with fired clay (not sure if you've got a kiln anywhere your setup), it might be neat to try making interlocking sleeved cylinders. Shouldn't be too different than making pottery around some forms. Then after firing those, you could stack those sleeves to be used as a chimney liner for something like this. Perhaps adding one or two feet to the height, since those would help support the surrounding clay/cob from deforming too much.
Hi Paul. No kiln yet, but I have something that might work. I like the idea. I’ve been thinking about trying some clay mixed with sawdust to create a fire brick. Could do them in a cylinder form to do what you are suggesting. Thanks for the feedback and thanks for watching.
Really neat design! This could be incorporated with a shower house, a hot tub, an outdoor cookstove, or add to a spa-like environment Once this is finalized, I’d use copper pipes or pecs designed for heat for the hose. Also, wouldn’t it be better for the heated water to got the bottom of the bucket (instead to the top) and the cold water to come from the top? As hot water enters the bottom of the bucket, the heat would rise, causing a convection current so the entire water mass increased gently, instead of downward in layers. The cold water, being heavier, would lend to cycling faster from the top, as well. Once the cob dries and bakes, this will become much tighter and more efficient The way you have it now lends to maintaining temperature layering and would be harder to draw from with a spigot, as the first water you draw will be the coldest. Nice prototype experiment! Excellent explanation I like your long-fiber use of cob!
Thank you, Monica. I agree there are many applications. I hadn’t considered your suggestion on switching the feeds. I’ll have to try that. Thank you for the feedback. Thank you for watching.
The Hopi Indians in the SW USA built adobe dome dwellings called “hogan” that kinda remind me of your mud rocket stove. Doorways and Windows about the base with a central chimney. Fun project! Thx!
@@GreenShortzDIY I saw this video to the side of a video I was watching. I clicked on it and thought is was a great video, as I said above, so I've subscribed.
So, you won't need a circulation pump to get the water moving through the tubes? Also, could this be coupled with a heating radiator (or coupled with a hot water cylinder to 'store' more heat) to heat a room/space? do you think that'll work? That's an awesome build you did there! Thank you in advance!
Sorry for the slow response. Yes, the water flows using a thermal siphon until the temps are equalized. I have thought about hooking this to a car radiator. I think that would work. Similar to a house radiator. Thank you for the feedback.
How long did it take to heat the water to touch hot? You're losing heat out the top of the chimney. Could put a kettle on there😊 or make the coil go up farther.
Would it be more efficient, and safer if a damper was designed near the top of the chimney? That way the flames would be contained and the heat more concentrated around the tubing?
Hi Loz. Cobb (or cob) is the same formula as adobe-clay, sand and straw. It is fun to build with. And if protected from the rain, will last a long time. Thank you for watching.
@@GreenShortzDIY thanks for the update, it would get wet during the rain where I have it in mind. It does look fun to build. I want something to heat the water in my out door tub. It's been a long time coming. I had a fire under on old one, but this one I want to paint so don't want the black marks coming up. You have given me some ideas tho. Thank you
thanks for sharing... interesting design...... how is this stove holding up over time?? ... is the cob cracking or breaking apart at all???.... curious does the grass binder burn out over time???...
I haven't used it a lot since I moved the outdoor shower a the bigger stove. I've kept I covered so it won't dissolve. I have a problem in that I have too many rocket stoves. None of them get enough use. :-) Thanks for watching.
I haven’t done a proper sealing on any of my cobb stoves or the bread oven. The oven has a roof over it, I keep the water heater covered, but my first cobb rocket stove has almost completely dissolved in the weather. It has been almost three years since I made it. I did get a suggestion in the comments of my first build to use boiled linseed oil. But I haven’t tried that yet. Thanks for watching.
Handmade rocket stove is good! In Japan, where I live, it has become cold in the fall. I use a clock-type stove. Warm tired body by boiling water and drinking coffee during breaks in farm work☕️
Thank you for your reply! I live in Ibaraki Prefecture. Due to global warming, winter is getting warmer. Still, the area where I live is windy and winter farming is difficult. You went to Sendai! There was a big earthquake, but now it has recovered and returned to a bright town.🤝
I lived in Shimonoseki and almost froze while I tried sleeping under my kotatsu table and blankets in January and February, even though I am Canadian, I have never been colder! We only had a kerosene stove for the whole house.
How long before fouling occurs on the copper tubing? (soot and resin build up, lowering the efficiency) About to build one of these with kiln bricks, and was thinking of making the tubing removable, so I can scrub the scaling off.
Instead of placing coil inside the near the fire. I would have encased the coil inside the mud. Still getting the heat from inside but would have given you a much larger coil ring for more water to be heated.
Once the cobb is "cooked", can you put a pot to cook on the chimney? It seems like a "waste" of good heat up there (and as others mentioned, definitively a much taller chimney and more copper pipe would make it much more efficient... but I want more!!)
That was cool. Always super satisfying managing to build one of those devices that heat water with only super durable stuff. Now what I want to know is how this model compares in core temperature, gas emissions, and volume of BTUs transferred to water, to a model made with the same cob and the same heating chamber core surface area, but which has the coil in the place where you would put the barrel on this rocket stove : on the way out of the hot fumes, but not in the heat riser itself. Because in the rocket stoves DVD they say that the second is better. Hey I'm building one right now!! Maybe out of stainless steel if the shop say they can weld it for me at a reasonable price. It's just to hold the ceramic boards in place, it's not the actual rocket stove.
I've seen videos on these before and the hot water hose gets so hot it almost melts. Could you/should you use steel brands like the ones from a clothes washer?
To my understanding steel compresses and expands a lot more than copper due to thermal shocks. So basically the steel will eventually break the mud apart from moving due to heat.
The water circulates because of convection. Heat rises. The cold water is heavier. It sinks as the water heats up and rises. The resulting movement is a current.
@@GreenShortzDIY Thank you sir. I did understand it a such, just needed clarification. I'm thinking of building a similar kind of setup with a 9kg propane/ gas cylinder (20L water) in vertical stance with a flame/heat resistant tap. Here in south africa we call it a donkey. Difference is the use the 200L drums in a vertical position above a fire. With the coming african revolution and civil war here a geyser/donkey setup with a rocket stove will work wonders.
Good suggestion. I did like that bending the copper by hand allowed me to feel how it was moving...at least my first time at it. Thanks for the feedback.
i wonder how well one of these water heaters would work if you had a much larger metal tank, like say 6 ft tall and 24 diameter and had a small pump pushing the water thru much quicker. just the mass of that steel tank full of hot water could keep a greenhouse above zero over night when its freezing out.
I think you are correct in your thinking. The thermal mass of the water would hold the heat better than air. That’s for sure. Thanks for the feedback. Thanks for watching.
Have you experienced any cracking of the cob base, or chimney? The metal grid and the copper coil will expand and contract. Thanks for sharing. Regards from S Africa Clive
Hi Clive. I haven't run this stove enough to see those results. I need to reconnect the bucket and run it some more. I'm assuming what you are suggesting will happen over time. Thanks for watching.
GreenShortz DIY bro that’s a secret. That’s really we used on dirty kitchen but we used it pure ashes we added water to mix and form as you want. I want to see that on your next project. Stay safe God bless
Hi Artur. Thanks for the question. A few factors in the answer, how much coil do you have, the temp of the fire, and the volume of water. I didn’t actually quantify time to heat on this burn. On part two I think it took about 20 mins to heat 5-7 gallons of water to 100 degrees F. Hope that helps. Thanks for watching.
Just an idle thought, if you want more perilite, couldn't you sandwich some between the mix & the cobb? Make a slab of the three & wrap it around the coil.
Ha! True. I always make that mistake. My mother was always correcting my grammar. Mom is that you? Did you change your screen name again to razz me? :-) Thanks for watching.
Hey, Just started getting into Cob and Rocket mass heaters/stoves and underground homes as alternatives to modern housing. I'm in georgia too. Are there any groups and/or individuals that would be good for to meet up with for me to learn more?
Hi Geoff. I'm not sure of a group in GA. Southface Institute might be a good resource in Atlanta. There are more building-science focused, but might know of some grassroots organizations. Also look into Living Web Farms (on TH-cam), they might know of a good group in GA. The are in one of the Carolinas, I think.
Great video. As you like challenge look about having a better heat exchange. Heating water with fire and copper inside and then cold water thru. Look at geoff Lawton rocket stove heating water first version you will love it.
I'm working on making an animated 'explainer' video to share my ideas about off-grid electric power generation. My original goal in watching your videos was just to get a good rocket stove reference that didn't require welding. Instead, I've been binge watching for two days and then I subscribed. Your ideas are brilliant. If and when I complete my animation project I'll have to post a link to your videos.
To avoid kinking you could take a length of narrower gauge hose like that for aquariums, oxygen tubing, etc and run it inside the copper for support but still flexible.
Just curious as to how many gallons of water you could have heated to a boil by just placing a pot with water in it on the top of the chimney in the same amount of time. Nice project though.
Couldnt you spray the high heat paint on the pellet or backing for your rocket stove, the stove meant for autos or bbq ovens im trying to make a kiln for small jewelry pieces
Hi Rob. I did notice all that heat flaming out of the top of the rocket stove. I hadn’t thought about putting the water storage there. Thanks for the suggestion.
any problems with the copper/ heated floors with copper get abraded by expansion and contraction.. But the cob will most likely be less of a problem.. Nice video.
You can also send a steel cable down the copper tube to prevent kinking. If you pull some cable out as you twist it it's less likely to get stuck. That is the best way to do brake lines btw... You can also fill it with water and freeze it
Are you able to see the hot water entering the reservoir or see the cold water leaving it? I think it would be interesting to visualize the circulatory process! Just a thought
The pearlite is added as insulation, so the mortar mix absorbs less heat. The copper doesn’t melt because the water pulls the heat out of the copper so quickly that it doesn’t build up. If the water wasn’t there, the copper would melt. You can boil water in a styrofoam cup sitting in a fire for the same reason. I didn’t believe it until i tired it. Thank you for watching.
Hi mate, have enjoyed your DIY vids so far and hoping to collaborate on not so much an upgrade - but a much larger version.. A larger model, bigger firebox, 2 or 3 self feeding inlets at 12inches, 4 (or more depending the need) outlet flu's - each flu a copper water coil as you demenstraded. I`ve aquacuture ponds to heat but thinking if designed well....can have a smoke oven, hot oven, resting oven, bbq plate as well (all through the same conservation concept) - and whatever else the designer desires. Cheers. Adam
That sounds cool! I like you idea to heat your fish ponds, while using the stoves to cook and bake at the same time. Thanks for watching. Let me know how your build goes.
Thank you for your videos, my 11 yr old grandson and I are going to be making a rocket stove!
You should stretch out the coil slightly and mount it inside a wire tube so the clay is not in contact with the copper tube. If there’s a slight space between the coils it should be more effective. You can even incorporate it in the side walls of the fire pit as well the lower it is the better. You should make a damper to slow down the burn. It burns too fast so you use more fuel. That would also be good for a home made hot tub in the yard. In summer I do all my cooking on one make of recycled bricks.
Thanks for the damper tip. I need to learn about methods in that a little more, but I understand the concept. I do another coil in a bigger rocket stove, that is open inside the riser. Works better. I’m impressed that you do all your cooking on an rocket stove! Awesome!
Another possibility is to wrap the copper tubing loosely around a short piece of PVC pipe of the desired diameter for the coil like 6 inch perhaps. This should keep it from kinking at all, although I've never tried it.
A damper is contrary to the operation of a rocket stove.
Hello Henry, would you have some link that shows what you are explaining? Thanks ahead.
Nice proof of concept project. Okay for short term. Exposing that copper coil to the extreme heat will burn it rather quickly. You are spot on about cobb's versatility. If there is a fail, break it up , re-hydrate and use again. Wonderful.
Great project! I also really appreciated not having background music with everything. It had a good balance.
Thanks for the feedback. I throw an audio track in when I need to. If my high-speed video goes over 1000%, the audio drops out of the render. So, I cover those spots with music. Plus, some sections just feel like they need a jam. :-) Thanks for watching.
@@GreenShortzDIY I do agree with Worthless Professor on this, I'd rather hear ambient sounds than a soundtrack. I realize many(not you) think they are making hollywood blockbusters rather than sharing the knowledge they have gained over a lifetime of experience. Which often comes with many failures and some great successes. Rather than the music some feel compelled to add I personally would rather hear the"oh sh** i screwed that up and i need to redo all this part"
I'm a hands on guy who learns from others mistakes as well, at least when they share them. Not sure why people feel compelled to remove the not quite perfect projects. I've never started a youtube channel even though I've been making projects since i was a youngster, and that would be about 50 years ago (smiling face inserted here)
keep up your great work, i enjoy it greatly. thanks again, halfnuts.
You can also fill the soft copper with water, then freeze it. To prevent kinkage.
To prevent kinks in your copper pipe you could try bending it around a piece of schedule 40 pvc or other pipe in the size that you want the coil to be. The trick is to keep the copper pipe close to the pipe used for the shaping and bend it a little at a time. It makes a perfect uniform coil without kinks if done right.
Use salt for filler to bend it. Easier to get out being water soluble.
Good tip, Jim. Thank you. Thanks for watching.
@@GreenShortzDIY can get real tight bends and coils.
...or sand
@@GreenShortzDIY qq
Or use a steel ‘spring’ that fits over the copper pipe.
We used to sell one designed for this purpose at a plumbing supply I worked at.
It’s coils are too tight to be a spring but it creates a bendable but circular pressure evenly over the copper.
Quicker and easier than filling a length of copper. Move it along the pipe as you make each bend
TY! Been wondering. Why is the riser section necessary? Why can't you go straight from the burn chamber into the Mass/water material then out the flue?
In my experience, the riser is needed to create the draw. But, there is likely a way to get more heat to the water, faster. This was a fun experiment. Thank you for watching.
@@GreenShortzDIY Thank you
This project is good to do it outside because it needs a co2 pipe to bring the gases out. But it works nice outside. Thanks for sharing.
Tom a couple questions. How long did it take to heat the 5 gallons of water and how much fuel was used to get it hot? Great design really like the concept. it got me thinking of making one of my own.
Hi Rick. I don’t think I got the whole bucket heated during this test. Although, it might have all been warm if I mixed it. I also really didn’t measure my fuel...I was under the gun to get it done. When I do part two, I’ll be more scientific...have a thermometer on hand, have all my fuel ready for a visual and most importantly, no leaky bucket. Thanks for watching and for the encouragement.
@@GreenShortzDIY I'm looking forward to "Part 2." :)
Thank you for the video, i'm facinated by rocket and similar wood-burning stoves. I am particularly attracted to the heat efficiency and low-pollution achievable which I understand comes from having a very high temperature extended chimney above the fire to complete the burn. Having a pipe for water heating is attractive but being so close to the inside of the chimney, I think this must negate the high temp chimney objective. I presume this why we often see a cover over the chimney, forcing the exhaust back down and exhausting at the base. The area between the chimney and the cover is the area where heat could be harvested with the coil to heat water, without risking the "hot chimney" principle. Any thoughts - have you tried this sort of design ?
Rhian Taylor Hi Rhian. I think what you are talking about is called a rocket mass heater. It’s related to a rocket stove, but usually has a taller chimney and a barrel or some over the top to provide complete combustion while forcing the warm exhaust through a “mass” to absorb the heat and radiate into a living space. The complete combustion relies partly on a very hot riser. It’s sort of the nozzle of the rocket. I do want to eventually make one of these, but I’m still in the learning phase. Paul Wheaton is a guru on the subject. You might enjoy some of his videos. Thanks for watching.
@ Rhian Please check out Audiobro for a great rocket mass heater and cooking stove with optional hot water heater. he offers plans for the two versions with personal help if needed.
Love this build! would be interesting to see the difference between having a coil or just heating a boiler over the flame and letting that thermo-siphon into another container instead.
Thank you, John. I think a pot on the top would have been more efficient, or gathered more heat. Of course, I wanted to try the coil. :-) Thank you for watching.
The coil allows to cook something on top of the rocket stove and still prepare some hot water, for doing dishes or a shower later on...
so the water makes the cycle itself? i assume because hot water wants to raise up, it automatically goes into the bucket itself? replacing itself with new cold water from below? i keep seeing this type of water heating from a stove but in none of the videos it explains how it works,
Pro Tip: Another way to curl copper tube is to fill it with water and put it in a freezer, the ice will support the tube wall which prevents kinking.
thanks for the nice video but the sand clay mix does not crack when it dries?
thanks
Can you combine the copper coil here with your paint can rocket stove for a portable setup? Camping in the deep woods with hot water would be awesome!
Hi Carrie. I love that idea. I'll put that on my list. :-) Thanks for the comments.
Incredible.....just want to be off grid so bad when I watch stuff like this. Thanks so much for informing us all how easy it can be with DIY projects my friend. I love the color of the red clay can a person buy it if they don't have access to this type of clay?
When you say you put the hose up the coil on the inside, what is keeping the hose from melting inside? Please help me to understand that particular step of the process please. I'm a first timer. Thanks
Enjoyed the video!!!
Awesome demonstration! The next part should answer so many questions i have. Thank you, much appreciated!
Hi Amber. Send me your questions and I'll do my best to answer. :-) Thanks for watching.
Great project. The only thing you needed to do was change up the hosing. The top hose in your cob stove needs to go to the bottom of your bucket so that the convection heat can continue to rise and then run your top hose from your bucket into your cold water intake in the oven. We did this in alternative energy in college with a solar panel.
All of this is nice , but Im wandering how long will copper pipe hold on this kind of temperatures?
Interesting watching the cob being made! I Made a cement copper coil stove recently too. I also used 3/8 pipe but roughly 3x more. I found that it burnt so much better when I slipped in my flu extension. And it got much hotter. So far I've used it to heat 200l of water with success.
How much time did you to heat up 200lt of water?
@@flamel397 takes 3 hours to heat up
But that's not 100% of the tank. I only use the top quater as that's always the hottest part. Normally comes out at about 45c
@@calmauric8218 im asking cz im trying to build a greenhouse with this method to heat up the gh and to make sure that theobroma cacao has 23/25 C temperature all the year. Did you actually know if this method with heating the water cloud help me to do this? (I'll heat up approx 300lt of water in the cold night)
@@flamel397 ok. Look into "rocket mass heater" several people have successfully heated a greenhouse bed in Sub zero temperature. It's like a rocket stove. But even better
Sped-up construction noises is my new favorite sound!
The “thermal” pump works better than I thought it would. Thanks for the education!
Thanks for watching Dave. I was excited to see it flowing. A fun experiment for sure.
Wow.. It burns extremely clean
Yeah. I need to capture some of that heat coming out the top. Thanks for watching.
Did you have problems with soot building on the copper tubing? thus reducing the efficiency of the heat transfer to the tube
You could've used your pvc as a form for wrapping the copper coil. Cool video, thanks man!
Man the sounds around your place! Crazy sounding with the sped up recording!
Thanks 4 the vids - about to make one myself. What about making the j tube firebox since u r 1\2 way there anyway? May get a hotter burn.
Pot stand at the top of the chimney for a cook-stove & water heater combo?
"Stoked"...no pun intended I am sure😎 Nicely done...I am interested in your follow up video. Thanks
Was there a pun? 😂 Actually, all puns on this channel are fully and painfully intended. If you knew my father’s humor, you’d understand I had no chance. 😳 Thanks for the laugh and for watching.
Fill it with sand is a must 💜
You wasted so much hot gases and energy from short chimney, you must utilize chimney design either make it longer and longer copper coil or add extra heat absorbing material to the chimney.
Su, you are right. I was surprised how short the coil was for a 10 foot piece of copper. This was an experiment, of course, but if I made this again, it would have a much longer cool and taller chimney. Thanks for the feedback and thanks for watching.
Do you have a design that you highly recommend? Thank you
i thought it seemed like waste of energy too and it slipt my mind that instead of copper coil we could use some kind of water container right on the fire instead, sealed with input/output to larger container somewhere making use of " thermal siphon"??
@@jesuschristislordoflordsan427 Hmm... a double walled chimney with water in it. 🤔 Now you got me going! 😀
Jesus Christ is Lord of Lords and King of Kings the copper pipe has more surface area and therefore will heat quicker
I'm thinking of using something like this with a water pump to go with my pool. How could you capture more of that heat? Most of your heat is leaving through the top, is there a reasonable way to capture a lot more of it? Is it just to make the copper tubing longer?
Hi Joseph. Yes, this definitely lost a lot of the heat. I think you could add a second boiler pot to the top. Or just make a much longer coil. Thanks for watching.
Loved the muddy feet part! Can you put a written explanation of the dynamics of this here? I don't understand how it is working. Also, is the rubber going to melt or dry out if it gets too hot?
Good job with the coil👍
Thanks 👍
I'm so jealous of your unlimited access to Georgia clay 🤔 😉
Lol. I can only dig my yard so deep before the house falls in. :-) Thank you for watching.
Great stuff as always. TY
Is cob better for water heater ? Or is you's pear lit, sand, concrete mix better ? Heating water wies.
I could not tell in the video if you covered the copper coil with cob. Can the copper be exposed to the fire? I plan on making one of these but thought that the copper would melt if it was not covered
Hi Porter. The copper coil is exposed on the inside. I think that as long as the coil stays full of water, it won’t melt as the water will pull the heat through the copper fast enough. I’ve actually boiled water in a styrofoam cup sitting directly in a fire. The water is a much better conductor and pulls the heat though the foam faster than it can melt. I’m working on another coil water heaters today. It will be fully exposed to flame in a rocket stove. Let’s see how it does. :-) Thanks for watching.
If you can do anything with fired clay (not sure if you've got a kiln anywhere your setup), it might be neat to try making interlocking sleeved cylinders. Shouldn't be too different than making pottery around some forms. Then after firing those, you could stack those sleeves to be used as a chimney liner for something like this. Perhaps adding one or two feet to the height, since those would help support the surrounding clay/cob from deforming too much.
Hi Paul. No kiln yet, but I have something that might work. I like the idea. I’ve been thinking about trying some clay mixed with sawdust to create a fire brick. Could do them in a cylinder form to do what you are suggesting. Thanks for the feedback and thanks for watching.
Really neat design!
This could be incorporated with a shower house, a hot tub, an outdoor cookstove, or add to a spa-like environment
Once this is finalized, I’d use copper pipes or pecs designed for heat for the hose.
Also, wouldn’t it be better for the heated water to got the bottom of the bucket (instead to the top) and the cold water to come from the top?
As hot water enters the bottom of the bucket, the heat would rise, causing a convection current so the entire water mass increased gently, instead of downward in layers.
The cold water, being heavier, would lend to cycling faster from the top, as well.
Once the cob dries and bakes, this will become much tighter and more efficient
The way you have it now lends to maintaining temperature layering and would be harder to draw from with a spigot, as the first water you draw will be the coldest.
Nice prototype experiment!
Excellent explanation
I like your long-fiber use of cob!
Thank you, Monica. I agree there are many applications. I hadn’t considered your suggestion on switching the feeds. I’ll have to try that. Thank you for the feedback. Thank you for watching.
Intreaguing, I really hope I can build something like this one day. Thanks.
The Hopi Indians in the SW USA built adobe dome dwellings called “hogan” that kinda remind me of your mud rocket stove. Doorways and Windows about the base with a central chimney. Fun project! Thx!
Cool. I’ll have to look that up. Thanks for the info. Thanks for watching.
NAVAJO hogan, not Hopi. Find pics on
Great video. But shouldn't you use metal pipe for the hot water output, like with a still? That boiling water could melt your hose.
That is a good tip, Wanderer. The hose was just a cheap garden hose and it was getting softer as the water heated up. Thanks for watching.
@@GreenShortzDIY I saw this video to the side of a video I was watching. I clicked on it and thought is was a great video, as I said above, so I've subscribed.
@@southernwanderer7912 Excellent. Nice to have you watching. Have a good night.
@@GreenShortzDIY By the way, I'm near you in S.C. Have a good night.
So, you won't need a circulation pump to get the water moving through the tubes?
Also, could this be coupled with a heating radiator (or coupled with a hot water cylinder to 'store' more heat) to heat a room/space? do you think that'll work?
That's an awesome build you did there!
Thank you in advance!
Sorry for the slow response. Yes, the water flows using a thermal siphon until the temps are equalized. I have thought about hooking this to a car radiator. I think that would work. Similar to a house radiator. Thank you for the feedback.
@@GreenShortzDIY brilliant, keep up the great work!
How long did it take to heat the water to touch hot? You're losing heat out the top of the chimney. Could put a kettle on there😊 or make the coil go up farther.
Would it be more efficient, and safer if a damper was designed near the top of the chimney? That way the flames would be contained and the heat more concentrated around the tubing?
Could you have put cob around the copper pipe? Would that make the water hotter?
I think it would help the heat be more even. Might also make the copper last longer. Thank you for the question. Thank you for watching.
What is cobb? Super cool to watch, quite relaxing too
Hi Loz. Cobb (or cob) is the same formula as adobe-clay, sand and straw. It is fun to build with. And if protected from the rain, will last a long time. Thank you for watching.
@@GreenShortzDIY thanks for the update, it would get wet during the rain where I have it in mind. It does look fun to build. I want something to heat the water in my out door tub. It's been a long time coming. I had a fire under on old one, but this one I want to paint so don't want the black marks coming up. You have given me some ideas tho. Thank you
thanks for sharing... interesting design...... how is this stove holding up over time?? ... is the cob cracking or breaking apart at all???.... curious does the grass binder burn out over time???...
I haven't used it a lot since I moved the outdoor shower a the bigger stove. I've kept I covered so it won't dissolve. I have a problem in that I have too many rocket stoves. None of them get enough use. :-) Thanks for watching.
Hi, great video...what do you seal the clay with to help preserve it? Thank You
I haven’t done a proper sealing on any of my cobb stoves or the bread oven. The oven has a roof over it, I keep the water heater covered, but my first cobb rocket stove has almost completely dissolved in the weather. It has been almost three years since I made it. I did get a suggestion in the comments of my first build to use boiled linseed oil. But I haven’t tried that yet. Thanks for watching.
@@GreenShortzDIY ok ,thank you...yes,i think i had heard one linseed oil also...Love all your videos, i always learn something
Handmade rocket stove is good!
In Japan, where I live, it has become cold in the fall.
I use a clock-type stove. Warm tired body by boiling water and drinking coffee during breaks in farm work☕️
私のビデオを見てくれてありがとう。 私は数回日本に行ったことがあります。 あなたの国が大好きです。 多くの素晴らしい人々と場所。 また素晴らしい食べ物。 冬に仙台に行ったことがありますが、寒さがどれほど寒いのか知っています。 あなたはどの町に住んでいますか？
Thank you for your reply!
I live in Ibaraki Prefecture. Due to global warming, winter is getting warmer. Still, the area where I live is windy and winter farming is difficult. You went to Sendai! There was a big earthquake, but now it has recovered and returned to a bright town.🤝
I lived in Shimonoseki and almost froze while I tried sleeping under my kotatsu table and blankets in January and February, even though I am Canadian, I have never been colder! We only had a kerosene stove for the whole house.
How long before fouling occurs on the copper tubing? (soot and resin build up, lowering the efficiency) About to build one of these with kiln bricks, and was thinking of making the tubing removable, so I can scrub the scaling off.
nicely build,i have made something similar for the swimming pool
Cool. I bet that is a perfect use for it. Also guessing yours is bigger? Yes? Thanks for watching.
GREATFULL IDEA FOR USES OUTDOR , CAMPING , ETC , THANK YOU MR GREENSHORTZ BE GOOD , I SEE YOU LATER
Thank you, Carlos!
Instead of placing coil inside the near the fire. I would have encased the coil inside the mud. Still getting the heat from inside but would have given you a much larger coil ring for more water to be heated.
Robert Montgomery agreed, I guess he will burn through that coil pretty quickly.
Once the cobb is "cooked", can you put a pot to cook on the chimney? It seems like a "waste" of good heat up there (and as others mentioned, definitively a much taller chimney and more copper pipe would make it much more efficient... but I want more!!)
add a TEG and harvest some electricity off the top!
That was cool.
Always super satisfying managing to build one of those devices that heat water with only super durable stuff.
Now what I want to know is how this model compares in core temperature, gas emissions, and volume of BTUs transferred to water, to a model made with the same cob and the same heating chamber core surface area, but which has the coil in the place where you would put the barrel on this rocket stove : on the way out of the hot fumes, but not in the heat riser itself.
Because in the rocket stoves DVD they say that the second is better.
Hey I'm building one right now!! Maybe out of stainless steel if the shop say they can weld it for me at a reasonable price. It's just to hold the ceramic boards in place, it's not the actual rocket stove.
Excellent ! Thank you 🌹👏🌹👏🌹
Thank you for watching, Sandra.
That's awesome!
Que pasada de trabajo harías funcionar la calefacción de una casa con esta estufa?
I've seen videos on these before and the hot water hose gets so hot it almost melts. Could you/should you use steel brands like the ones from a clothes washer?
To my understanding steel compresses and expands a lot more than copper due to thermal shocks. So basically the steel will eventually break the mud apart from moving due to heat.
@@worxharder9470 I am talking about the water hoses on the outside of the mud casing. The in coming cold water and the out going hot water hose.
where do you connect the shower head, this looks lovely but so complicated do you have a manual for ladies
Ha! This is a little complicated. No manual yet. :-)
go back thru the video, do screen shots of each step. Its really not complicated if you handle it piece by piece, just like eating an elephant.
how does the water circulate? Dont you need a 12v pump for that. May someone please explain to me how the circulation works? Thanx!
The water circulates because of convection. Heat rises. The cold water is heavier. It sinks as the water heats up and rises. The resulting movement is a current.
@@GreenShortzDIY Thank you sir. I did understand it a such, just needed clarification. I'm thinking of building a similar kind of setup with a 9kg propane/ gas cylinder (20L water) in vertical stance with a flame/heat resistant tap. Here in south africa we call it a donkey. Difference is the use the 200L drums in a vertical position above a fire. With the coming african revolution and civil war here a geyser/donkey setup with a rocket stove will work wonders.
Extreme knowledge! Thank you brother you are awesome!
Thanks for sharing!
Bend your pipe around your pvc chimney form.
Good suggestion. I did like that bending the copper by hand allowed me to feel how it was moving...at least my first time at it. Thanks for the feedback.
Came to say this!
How long did it take to heat water?
Why aren't you trapping heat with lid on bucket; how much faster would it heat with a lid?
The bucket was just a temporary test unit. It didn't matter how long it took to heat the water. So he didn't need a lid.
@@DerekRoss1958 interesting. That's one of the things I would be testing for.
i wonder how well one of these water heaters would work if you had a much larger metal tank, like say 6 ft tall and 24 diameter and had a small pump pushing the water thru much quicker.
just the mass of that steel tank full of hot water could keep a greenhouse above zero over night when its freezing out.
I think you are correct in your thinking. The thermal mass of the water would hold the heat better than air. That’s for sure. Thanks for the feedback. Thanks for watching.
Great idea. I bet people in California are wishing they heard about this before their power was turned off
Ha. True. Thanks for watching Josephine. Have a good day. :-)
WE are watching ! the big one is just around the corner ..
Californians deserve cold showers
@@eieio-mn9pm boomers should have never been allowed on the internet...
This is brilliant. There has to be Irish 🇮🇪in here somewhere 🤣
🙌🏼 thank you for watching.
Have you experienced any cracking of the cob base, or chimney?
The metal grid and the copper coil will expand and contract.
Thanks for sharing.
Regards from S Africa
Clive
Hi Clive. I haven't run this stove enough to see those results. I need to reconnect the bucket and run it some more. I'm assuming what you are suggesting will happen over time. Thanks for watching.
THIS IS AWESOME!!!
Good job bro Try this tips. Collect the ashes strain them and mix it with your clay like cement. That’s what we used back home it looks like cement
Thank you, Franklin. Love the ash suggestion. I’ll give that a try. Thanks for watching.
GreenShortz DIY bro that’s a secret. That’s really we used on dirty kitchen but we used it pure ashes we added water to mix and form as you want. I want to see that on your next project. Stay safe God bless
Good day my friend nice vedio god bless i hope stay connected
how do you make cob, and can you use it a cold climate in the PNW
just one question... haw long takes you to heat up water to the decent tem, let say 60degC? Idea is amazing... i'll will use it in the woods anyway :)
Hi Artur. Thanks for the question. A few factors in the answer, how much coil do you have, the temp of the fire, and the volume of water. I didn’t actually quantify time to heat on this burn. On part two I think it took about 20 mins to heat 5-7 gallons of water to 100 degrees F. Hope that helps. Thanks for watching.
Just an idle thought, if you want more perilite, couldn't you sandwich some between the mix & the cobb? Make a slab of the three & wrap it around the coil.
Question .. You said you are making a "hot water heater". If you have hot water, why do you have to heat it? Could it be a water heater?
Ha! True. I always make that mistake. My mother was always correcting my grammar. Mom is that you? Did you change your screen name again to razz me? :-) Thanks for watching.
@@GreenShortzDIY I was just messing with you. I called one a hot water heater one day and my brother asked me the same question.
:-) I know. And that’s allowed here. Thanks for the grin. Have a good night.
So awesome , thank you ,wow .
I was curious why you did not separate the coils
Hey, Just started getting into Cob and Rocket mass heaters/stoves and underground homes as alternatives to modern housing. I'm in georgia too. Are there any groups and/or individuals that would be good for to meet up with for me to learn more?
Hi Geoff. I'm not sure of a group in GA. Southface Institute might be a good resource in Atlanta. There are more building-science focused, but might know of some grassroots organizations. Also look into Living Web Farms (on TH-cam), they might know of a good group in GA. The are in one of the Carolinas, I think.
@@GreenShortzDIY Okay, thanks for the info. I appreciate it.
Great video. As you like challenge look about having a better heat exchange. Heating water with fire and copper inside and then cold water thru. Look at geoff Lawton rocket stove heating water first version you will love it.
Thank you Christophe. I will check out the Geoff Lawton video. Thanks for watching.
I'm working on making an animated 'explainer' video to share my ideas about off-grid electric power generation. My original goal in watching your videos was just to get a good rocket stove reference that didn't require welding. Instead, I've been binge watching for two days and then I subscribed. Your ideas are brilliant. If and when I complete my animation project I'll have to post a link to your videos.
To avoid kinking you could take a length of narrower gauge hose like that for aquariums, oxygen tubing, etc and run it inside the copper for support but still flexible.
Excellent video. 🙏💗🙏
Thank you for watching.
Yea. I always enjoy your video. Making everything so simple and easy to apply 💯💯💯🤟🤟🤟👍👍👍
nicely done
I stumbled upon you and am so happy 😃 I love it! Thank you I look forward to seeing more
Thanks for the encouragement, Linda. Thanks for watching.
Awesome video.
Just curious as to how many gallons of water you could have heated to a boil by just placing a pot with water in it on the top of the chimney in the same amount of time. Nice project though.
Couldnt you spray the high heat paint on the pellet or backing for your rocket stove, the stove meant for autos or bbq ovens im trying to make a kiln for small jewelry pieces
I bet it could work with a firebrick heat chamber for your crucibles. Depends on the temps you're looking for. Thanks for watching.
Use a metal bucket instead of plastic & place it 2/3 inches above the chimney? Max heat output capacity, just a thought 😸
Hi Rob. I did notice all that heat flaming out of the top of the rocket stove. I hadn’t thought about putting the water storage there. Thanks for the suggestion.
someitmes its probably very practial making use of " thermal siphon" to transfer the water from one room to another
@@jesuschristislordoflordsan427 Well, if the son of a carpenter said it... 😏
any problems with the copper/ heated floors with copper get abraded by expansion and contraction.. But the cob will most likely be less of a problem.. Nice video.
You can also send a steel cable down the copper tube to prevent kinking. If you pull some cable out as you twist it it's less likely to get stuck. That is the best way to do brake lines btw... You can also fill it with water and freeze it
Are you able to see the hot water entering the reservoir or see the cold water leaving it? I think it would be interesting to visualize the circulatory process! Just a thought
I’ve got a thermal camera, which would be able to see the hot water entering. I’ll have to try that. Thank you for watching.
Hey it turned out awesome dude !,,, love it and your video . Thank you..
i havent watched this channel in 2 years i forgot this existed. time to catch up on my fav
Ha. You've got some catching up to do. Thanks for the encouragement and thanks for all the watching. :-)
@@GreenShortzDIY last video i watched was worm bin composting that was 3 years ago. love the cob works.
Why did you mix Pearl light into your mortar?
Why doesn't the copper melt with direct contact with that flame?
The pearlite is added as insulation, so the mortar mix absorbs less heat. The copper doesn’t melt because the water pulls the heat out of the copper so quickly that it doesn’t build up. If the water wasn’t there, the copper would melt. You can boil water in a styrofoam cup sitting in a fire for the same reason. I didn’t believe it until i tired it. Thank you for watching.
Hi mate, have enjoyed your DIY vids so far and hoping to collaborate on not so much an upgrade - but a much larger version.. A larger model, bigger firebox, 2 or 3 self feeding inlets at 12inches, 4 (or more depending the need) outlet flu's - each flu a copper water coil as you demenstraded. I`ve aquacuture ponds to heat but thinking if designed well....can have a smoke oven, hot oven, resting oven, bbq plate as well (all through the same conservation concept) - and whatever else the designer desires.
Cheers.
Adam
That sounds cool! I like you idea to heat your fish ponds, while using the stoves to cook and bake at the same time. Thanks for watching. Let me know how your build goes.
Job done ✔ You inspired me 👍