Wow, when you first built this I was very interested in the long time run of this, I love that you came back to it! Good job on the engineering of it!

There's something unbelievably satisfying about watching you do this kind of engineering. Just love all the in-depth knowledge and thought you put into this, and the great way you communicate it. Keep it up, and cheers for all the videos so far!

You should show a timelapse of a couple of thermometers around the room starting at pre-ignition and ending at what is you're comfortable working temp. So we can see it in action.

Put a stove burner on top of the helium tank and then you could make soup and/or coffee while you're running the heater.

I built a rocket mass heater in my living room about the size of a small elephant and you hit the nail on the head today. To make it work correctly at least, you have to run it for a long time and that means like you said, sitting on the floor splitting wood and feeding it. The problem is, since mine is so big, I have to feed it about eight hours a day for three or four days in a row, before it will maintain a comfortable heat level in my living room. Live and learn. As for my “shop“ heater, I made a very tiny rocket stove out of air Crete and ceramic and I just let it roar next to my workbench. I used a nitrogen cylinder for the primary chimney enclosure and a run an inch and a half 14 gauge square steel tube out the side across the shop and up to the stack. The horizontal section of that has corrugated tin “fins” welded where they touch the pipe and The whole thing works like a champ and heat things up lickety-split. Of course, it looks like hell, so if you have a wife or girlfriend, it probably won’t fly. Edit: A Simpler fix to prevent down-draft from wind is to drill holes on the vertical sides of the chimney pipe from the top down about 12 inches. Next, weld a cap on top, which prevents wind and rain and snow and birds and so on from going down in there. Next, weld a piece of steel pipe, open at each end over the termination .6 inches each direction, past the drilled holes. When viewed from the top down, it would look kind of like Darth Vader‘s stealth fighter, kind of. Anyway, all the holes you drilled lets the exhaust out, but wind blowing from the side or down can’t hit the holes, so it doesn’t become a problem.

I've been intrigued by these rocket mass heaters ever since I've come across them. I've watched all your videos on your heater. I like your more scientific and engineering approach to it. Thank you.

Cool video. Got a couple of ideas/suggestions. 1. If you block of parts of the vent towards where the wind blows from, I think it will create suction instead of blowing air "backwards" into the system. 2. About the exit-baffler: Water Pipes etc. should have the valve-handle so that it's "across" when it's closed and "along" the pipe when it's open. That way you can see with a glance it it's open or closed. Might be an idea for the baffler-handle. Almost forgot: Peace man.

Stoked dude and PERFECT timing. Just been offered a Pot Belly stove by one neighbor and a wood pellet stove by another and neither are rocking my world (although I am grateful for the generosity and thank God for good neighborly relations). My shop is 36 x 32 and very high. It's freezing in there all winter event though it's insulated. Miserable quite frankly and I don't like the idea of $$$ on a high end electric system. I have wanted to build a mass heater for a while but have been too chicken shit. This has given me some confidence. Thank you so much mate.

Fantastic update. Have been hoping to see a followup since the original series. Great work and chuffed that all your hard work payed off.

I've never been more proud of my name being on something but also I'm glad to give you more considering the fact you're making wicked entertainment....you deserved to at least be recognized for that.

I really enjoyed watching you make the heater, glad to see it’s efficient

All of the information I wanted, well ordered, good video. Thanks for all of the effort and being so clear.

From what I understand, super-heating the incoming air increases burn efficiency and insulating the exhaust flue improves the flow of exhaust gases.

On today's episode, I'm cutting a hole in my goddamned roof. Balls of steel.

Very interesting, I hadn't heard of this until now. So rad!

Excellent. And you did a great job on your overkill exhaust improvement.

That is really cool. Gotta say getting something so efficient out of 'trash' is so Fallout/you lol

THANK YOU!!! So wanted this since I first saw it after subscribing. Love the channel! Keep up the awesome work. 👍🏼

7:15 - you get more than just steam out of the exhaust, it's just that CO2 is an invisible gas. The lack of smoke is a lack of unburnt carbon, which is indicative of a very effective burn cycle. If you wanted steam only, you'd need to be burning hydrogen.

HI new here. You got me at "Hippies don't tell you this!!!" I love these rocket mass builds, hoping to one day build my own. Its nice to see one made without the beads and couch attached to it! Thanks for making me feel "Normal" for loving these!

I love the idea of a rocket stove. The trick to NEVER GET SMOKE INSIDE is to make a venturi tube outside encasing radially and parallel with the flu pipe with a enclosed motor at the top of pipe. This way you turn on the motor from the inside and never have to worry about going outside. This is only to start the stove when needed. This is the BOMB if you know what i mean. Good day too.

you did the right thing building it to code, because someday someone else might use that existing chimney with a different apparatus that produces much hotter exhaust.

I love your style. Very well made video

Just thinkin, if you put a 90° bend on the exhaust and point it down wind, would it help create a draw?

Thank you Jairus of All! Your video was helpful and informative.

Love the mass heater vids!

This is sooooooooooiooooo awesome

Very cool system. I built one last year. Quite different but exact same principle. You brought up where you get some smoke during initial start up... as you know these heaters are like an organism. They need a different kind of attention. I use a propane torch to pre-heat the exhaust. It primes them to get the heat moving in the direction we want. It only takes about 30 seconds and pretty much eliminates the smoke. I also have a damper just prior to exit of garage to close off cold air from cooling the heater down after a good burn.

thanks for the tips! upped my game for sure... now it's time for me to learn to weld.

Nicely done

Great update vid!

Love it thanks for the update Ultimate upgrade auto feed and start up so you can program it to start for an hour or two every 12 hours

To code is always the best way. There might be a case some day where there's enough creosote build to cause a chimney fire (I know, rockets aren't SUPPOSED to, but...). Another: you sell the house. New homeowner puts in a standard stove. It's only a matter of time... Oh, and your on-off switch should have the 120V receptacle switched. Just because those small plug-in bricks are "Energy Vampires," drawing current (even if just a bit) whenever they are plugged in.

Nice series. I'm seriously considering doing this in my detached 16x40 shop. But I'm thinking that it would be better in an area that gets used more constantly though like a house. I may go out to my shop once a week or so. Do you think your stove would take too long to heat up an area that size? Also, about how much wood do you go through a day and what are your outside temps?

Yeeaaaaasssssssss. Been waiting for this.

Nice build

Enjoyed this. Do you have any recommended resources for designing and planning a rocket heater build?

Love the update. Wish I had the time and resources to make one myself. Also somewhere I needed to warm 😂. What's the smallest scale you think you could make one of these?

I would add a "vertical feeding tube" for longer pieces of wood, that opens to the fire chamber and is air tight when the pieces of wood are installed.

Nice setup. That dense cold air is the ticket.

Great! But how do you clean the ash?

For the wind blowing into chimney problem, fit a H Cap/cowl, this creates vacuum as wind blows, so more wind, more vacuum

I don't know if you will read this, but I have had this idea for a long time though mine is different to a degree. I think if you use ceramic spray coating on the inside of your tank you will make it last for decades. This is the same principle used in turbine burn tubes. But I like the use of actual science and practical use of space, though I think you could have adapted a better intake design, and intake air to better burn, and also have a longer burn. I would love to collaborate with someone like you on a design. You have common sense and logic.

Great video , and is there a video on the making or the what I would do different if I was the Builder for a dyi guy ? Can you do one with bigger would cuts

Interesting design. If you build another, do consider a batch box below the external intake.

curious how do you clean out the ash? do you have a trap?

I've seen a few people talk about cold start issues. The 2 fixes I recall are having a bypass to get the chimney warm before starting to warm the mass or putting the chimney near the bell so it's heated that way. Folks generally want to keep electronics out of the mix because they're either using it as primary or emergency heat and in either case they want to be able to get it started in an emergency when they might not have power. Not an issue in your situation and even if it was you could run the fan with a power bank in a pinch.

Does the rocket heater work well with wood pellets?

You're such a hippie, love it!!

This is awesome when I get a shop I want one

How do you handle the condensate from the cooled gases?

50 gallon drums.... not 500 gallon (oh them Hippies). LOL. Dude, this is just straight-up beautiful and just what I was looking for.

You could also put a Y joint on your air intake/fuel feed opening so that you can feed the fire without having to dismantle it every time. You'd need a cap for it and you'd still want to turn off the fan to get it going but it would make it a bit more functional. Might make it possible to construct some kind of automatic feeding hopper of previously processed wood too.

I have been told if the chimney doesn't burn hot enough you get creosote build up, if I understand that right then do you have build up and what do you do about it

Great video, it’s amazing what you can do with the Tinman’s decapitated head...also, is wiggly a scientific term?

Dude, you're such a hippie. I think I saw a yurt behind your garage. Thanks for the video

I love how you talk about the hippies.

Thank you!

Congrats, you just invented an inter-cooled, super charged wood stove. This is quite possibly the most over-engineered wood stove in history in the best way possible

Far out, man. This is so groovy. Keep on trucking. Peace.

Have you thought about putting a little fan on the helium tank to circulate the air and help warm up your garage more and faster? It also sounds like to should cobble together something to help split down your wood faster. This is my favorite rocket stove design I've seen thus far. I plan to build my own house and want to incorporate a rocket stove into the design.

Excellent.

Build a bypass chimney pipe you can send the exhaust through while you get it started and hot. Then when its hot switch the valve and send the exhaust thorugh the mass. It will give you faster and better stars.

Damn, I wish I had a shed so I could build a cool heater like this too!

How do you clean it out?

Nice job! Rocket stoves are a thinking person's woodstove... and even though mine is 4 years old... I keep messing with it, make new drawings, and will build version 2.0 at some time. There's so many innovations here on YT. I built a 6 inch flue rocket. It is a free-standing unit, utilizing a 55 gallon barrel. It is, internally, like the hippie rockets (hell, I am a hippie) only the riser is made from insulated firebrick (the most expensive component). The exhaust goes out of the bottom, and into a 15 foot long mass of cement blocks and crushed stone, at floor level. From there the exhaust goes up and out of the basement, through the wall, and outside through that super-expensive stainless insulated flue pipe, gifted to me by a friend (free is for me). My indoor flue temps, at building outlet, are similar to yours... rarely 150°... more often 120°. My stove is for heating my basement workshops, and the house above... the burn chamber is 8 x 8 inches,therefore, I can burn standard cordwood. From my experience, it looks to me as if smaller rockets are more efficient, and hotter... but most smaller ones are to heat workshops/garages, not entire homes... all I know is that I love using it. I was happy to get the insulated flue because condensation would run into the house, and black mung would run across the floor... at least it is water soluble, and cleans up with soap and water... I put a T flue pipe outside, at the bottom, with a seepage hole in a cap. This keeps all condensation outside. One thing I want to do is figure out an automatic lid, outside, that would close when the stove shuts down. I believe a lot of my mass heat is going up the chimney... and that the cold air, coming back down the chimney, cools the mass. I go through a wheelbarrow of wood per day. When I had a standard woodstove, I'd go through 3 wheelbarrows of wood... My rocket is on my channel if you'd like a look. The video is with the smaller 4.5 x 4.5 burn chamber... I've been using it for 4 seasons, and have had zero creosote buildup.

Three key issues need to be dealt with when designing rocket stoves: Air flow, extreme heat in the burn chamber and fly ash build up in turns of the exhaust piping... restricting air flow. In reference to the latter, (you've addressed the first two adequately) how many hours have you put on the stove? How often do you clean ash out the bottom of the Nautilus? Have you noticed any reduction in performance over time ( a sign of restricted air flow)? Would you put more clean outs in retrospect? If so, where? Thanks, M

Excellent

it's all about the insulated chimney column to really get things flowing in the right direction, especially in really cold weather and especially when you add vertical column height to it. Also, the ease of operator input is more of a major factor than one might first imagine. pellet stoves will self feed for hours, a long feed pipe with scraps of sticks that will slide down on their own might also self feed for hours.

Uncle Buck drill bit! Subscribed!

What's the difference between forcing cold air up, and forcing hot air down? How much cooler could the hot air be once it gets to the down tube? I can't imagine it would be significant, it's 6 inches from the to of the heat exchanger.

I did the very same thing a few yrs ago...but uninsulated dryer vent in-tube, Was in basement of two story so after basement got warm had some reverse ex flow problem when the heat rose up inside house so we just stayed in basement when it was real cold and the fan stayed on the intake. Great cooking on top of barrel with spacer so metal would not get red and warp?crack?melt? Lill cheat used wood chips I covered that was delivered in fall free., just added a expanded metal guide to hold em in place so my sticks were like a spacer that held the guide in place until all burned and started over..

Could you get it to run on waste oil? Or is that bad for the environment?

How do you remove ash from the combustion chamber? No matter how efficient the burn, there will be ash. I think I've worked it out, just like an ordinary wood burner, clean out the ash with a vacuum when it's cold.

Any cresote problems? It would be impossible to clean the pipes.

I think the reason they say you can't use steel is because the heat causes the steel to oxidize very quickly. You might be able to just replace it every few years to prevent that.

Could this be scaled up for 2500’ house?

Interesting project. Listening to your comments on the time spent feeding fuel into the stove makes me think this is a perfect candidate for a wood pellet feed hopper. Also, is your flue handle 90 degrees off? Or did you just move it the wrong way in the video?

8:28 ...... HOL' UP

Very nice

If you added a pellet feed, where would you patch it in?

Could you put a Peltier semiconductor to run the fan?

Chimney fire!

Did you have a high wind cap for your exhaust. If you use a high wind cap, it would help even more

what about adding some sort of hopper to feed fuel?

great video .. excellent theory and practical demo . first time I have seen a sort of torroidal burn chamber fabrication . I have my torroidal vortex design laying horizontal where it leaves the burn chamber the riser exits the centre of the donut shaped refractory cast torroidal secondary burn zone .

I love how angry you get at the hippies every time you talk about this system, haha

I think you have done a good job here I think the reason you can use metal in the burn tunnel is you have a micro system, I think if you had an 8 inch system metal would not last. I don’t think you give the hippie’s enough credit, I did laugh when you kept bringing them up because I think too many of us are over the top on political correctness, I Have been to Ernie and Erica’s place and seen their rocket mass heater they are probably the most experienced builders alive. And they are both extremely well educated about fire and thermodynamics you keep mentioning. Anyway I love the video thanks for sharing, thumbs up from me dude!

Hey, hippie here. If you have a predominant wind direction you should point the open end of you intake towards it, and the exhaust outlet away from the wind to generate a flow. If you want to get serious about harnessing that power also, you could stick a funnel on the intake side, and build a little venturi system on the outlet. That would negate the need for a computer fan, and possibly oversupply your stove with air (computer fan is a genius idea btw. I've heard that some fossil fuel based electricity generating stations preheat their intake air by drawing it down around the exhaust chimney, which results in such an efficient heat transfer that they then have to use fans to push the cold exhaust air out of the chimney. Similar to what you're doing here. Good Job)

If you could have... Would you have made the intake longer so you would be able to load more fuel at a time??? I am thinking you would also be able to have bigger intervals before you had to add fuel..?

7:59 I lost my patreon-supporter-desk-name in an unfortunate schmelting accident

Way do you cal them hippies?

How do u clean the pipe

I Really enjoyed this video. The ONLY negative thing I can say is, When you glued the Roof flashing/tube/cone/witches hat.... (please insert your local slang for this product/implement/component....here & save us all the corrections from the peanut gallery) You went ALL the way around the flange underneath. I was Always trained to leave the lowest point (bottom of the slope) OPEN with NO GLUE or adhesive (meaning; you glue ONLY the TOP side, the LEFT side & the RIGHT side yep, only glue those 3 sides) Because, IF there is any build up of water/moisture/condensation, it has some where to go/leave/exit/drip & NOT build up or back up over the actual roof hole & leak back into the structure. Is this a rare occurrence? I think so but, by the time you notice the leak inside the finished space, there has been enough damage to the unfinished space, you still have an even larger problem. I have asked many an Experienced roofer about this ideal/ideology/preference.... & have ALWAYS been given the same answer; Yes leave the bottom open to allow drainage.

You just breeze past that Austin powers Joke lol

He doesn’t like hippies, like Eric Cartman. The Cartman of rocket mass heaters.

Would a hopper with wood chips help the fueling side of this project? That if your so inclined is even something you could automate say... One of those timed release kibble setups for dogs but that feeds wood chips into your burner.

3:23 My first time here. Do you have a video of the nautilus chamber?

AWESOME stove! But man, the handle on the butterfly... 😅

Dude. I'm doing this!