Wood Stove + Rocket Mass Heater = Hybrid




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Bev Miller: So can one take a wood stove and fully envelop it in thermal mass to create a more efficient thermal mass hybrid approximating a RSMH?

Erica Wisner: Thanks, Paul! @RonRay: There are definitely drawbacks to incorporating a metal woodstove, especially in terms of efficiency. But there are some practical advantages: more people know how to light it without training, ditto the cooking or cleanout features. And citing the common EPA exemption for 'antique stove' may be easier than educating a local building inspector on mass-based exemptions or getting exemption letters. In short, it adds an element of 'normal' that some people like.

unkulmark: How much would it have increased the efficiency if Ernie would have added stacks of bricks along the sides & top of this wood stove? Has anyone tried covering a rocket hybrid wood stove in cob to increase the mass?

paul wheaton: This is why we have the forums at permies - to cover all this stuff in detail.

HighTechRicky: May eyebrows your computer?

paul wheaton: If you try to heat pressurized water, there is a good chance of an explosion that will kill you.

M M: Wouldn't you be able to achieve your highest goal by covering the entire body of the stove with cob?

Darren Rahn: What if the fire box of the wood stove was lined like a masonry stove? Would that work like an insulator to improve the rocket mass heater section, or as a heat-sink hindering the complete combustion if the gasses?

dnci1414: why not encase all sides and top and bottom in earth mass and then proceed on will earth mass coming out of the barrel.. this has me thinking as i have a double barrel heater in a out door building i building, that pulls cold air from my house and the rising heat come back into the house. it is right next to my house and i could possibly, well let me think a bit on it. any way i could see your stove done this way. dawid Israel

wai president: Hi, I like the view of fire, and plan to use rocket mass heater to heat water that will heat my floor, but I do not have a good design that can allow me to view the burning (with air wash feature) and have enough heat for the second conbustion. I would like some advice.

RonRay: I think the only way to incorporate a wood heater with a rocket stove, would be to use the cast iron stove as the heat riser (heat exchanger). But that is what the "mass" does in the first place. Either way, trying to incorporate a wood stove is just 'backing up': Benjamin Franklin already did it.

paul wheaton: Much like a conventional stove, you start the fire with kindling. Once that is gone, add some bigger stuff. By that time, the room is plenty warm and you stop feeding the fire. The room stays warm for a day or more. Feeding the stove every half hour is what you do with a conventional stove, not with a rocket mass heater.

Alfred Owen: To convert to normal stove to a rocket mass heater just build a wood insert insulated and set in side the wood box of the normal wood heater

MrHottleaded: I'm like you, I don't see truly how a rocket stove is useful with all I have read seen you need to feed them trigs every half hour. I don't have time to baby a rocket stove I have things to do like live. i Europe a masonry wood stoves have been used for 100s of years and can heat your water too.

Quodge: "Paul Wheaton" "why do you say it like that?" "like what? Im just saying Paul Wheaton" "like that, putting all the emphasis on the H"

Steve Berthiaume: when using a woodstove in this configuration- without the mass- is the exhaust still hot enough to rise up a conventional chimney? thanks!

Fynmarr: Awesome video, I was wondering about this. Thanks for posting. As a side note, the sped up video at the end was a little creepy somehow.

LibertyBooksAZ: Hey Paul! We need a LOT more videos of the Wisners giving us every scrap of knowledge in their heads, just like this one. Ernie is so articulate (Erika too!). You are making a resource collection that is extremely valuable thru this channel and your other websites. What sets yours apart is the ongoing discussions of what works / what didn't work / what worked for awhile but failed or got revised, and WHY. My deepest appreciation.

John Da Costa: When it comes to such matters, I am quite the simpleton. Upon listening to the faults explained in the video, it occurred to me that the simple act of insulating the old wood stove may be the solution, Just a thought...

TORQUER3: burn it burn it burn it...baby

paul wheaton: Yes. That would probably improve things with this design.

Chris Towerton: Info like this is a great help... Thanks for posting... More,more Chris

Suzy Bean: Good info.

Schpankme Verimuch: Your riser needs to be built from a different material, which will run hotter like 'aluminium'.

paul wheaton: @muserwood my latest video has a rmh with a lot of stone.

BaronVonSTFU: Perhaps you can point me in the right direction on this one, but I see all these videos and people say how warm they feel with the rocket mass stove and whatnot. I'm interested. But what is warm? Do you have any videos talking about actual temperatures of the room, or how big the room is? Am I able to walk around the room and stay warm or is it just warm around heater? Also, this might be an eye of the beholder thing, but isn't there anyone out there that makes rmh that don't look so rustic?

beetelgeuze: good upload, thnx

Steve Smith: I've been toying with the idea of building a stone rocket mass stove, (I can't seem to find one on YouTube) any thoughts?

Dan Murphy: Rubber or trash is not a good idea... "it does not work!", I drop a piece of my old charcoal in once in a while...I left a bag out in the rain.... it burn fine as long as it only 1 or 2 pieces at a time. But there book it tell you what flues work or dont work.

farmrdave: #2 with the brick mass ahead of the heat exchanger barrel, long after the fire is out the draft continues at a large volume. The air movement through the stove collects the heat from the brick tower then moves on through the heat exchanger I can place my hands on the heat exchanger barrel hours after the fire and it is still radiating heat while the pipe is cold where it exits into the chimney. Due to the volume of air removed from the room it is not efficient. Just passing on my results..

MrBuxton: it'd be nice to see diagrams or a more thorough explanation of how you built. thanks for the vid....just subbed.

Logan TheRedOne: So.... you are basically trying to re-crate a Franklin Stove? Look it up. Ben Franklin wanted everyone to have one so much he didnt patent it.

David W. Reed: I wonder if packing the wood stove in cob might be a shortcut to just making a full on rocket mass heater....

ZeroFossilFuel: Seems to me you could line the interior of the firebox with reflective fiberglass panels and firebrick to A) constrict the size of the opening increasing velocity and B) raise the firebox temp. Problem still is instead of continuous gravity feed and controlled burn, you're feeding by the load, making it flare up and burn out too quickly.

KJ's Garden: If the water were heated, or preheated, before pressurization, that should be workable.

paul wheaton: @muserwood my latest video has a rmh with a lot of stone.

madpainter69: Hi! good job on the video.. I was thinking about it a little... what about lineing the stove with fire brick? would that help? I would like to build from scrach with the rocket stove idea. whith a large fire box(like a wood stove)(so i would not have to keep feeding it) thinking biger scale because i want to heat a shop... well... and burn less wood... lol ... I'm probably wanting alot....Just thinking ot loud. thanks for your time...

string011: Seems like a rouge razor blade got to Ernie somehow. I'm glad to see this. I was planning on trying this myself later this year. It may be an excellent way to get the rocket tech thru the code process.

popoqwer: the world needs a lot more people like you...thank you!

Ben Dover: more.If you smell smoke,letting out fuel.Rocket stove you will only get water vapor and co2.masonary is better than a wood stove,less than a rocket.

Mario Gonzalez: I was thinking if the J part is what basically causes both the wood and gases to burn why can't I just install one in the front inside my woodstove with a back panel in the rear to let the smoke draw from the bottom.I already have an 8 shape exhaust pipe to get the most out of the heat with a fan that blows across it

KJ's Garden: yeah, I can't get past his hair and his perpetually sky-high eyebrows - together they are hard to watch... shallow, I know, but...

adammz08: @paulwheaton RE if you heat pressurized water your in for a chance of an explosion,,,, um dude,, just about all pressurized water heat devices usually get hot from heating. They all have a pressure release valve as normal just to release the pressure if it may get to a stage it will . Cast iron Wood heaters with water input and outputs are sold off the shelf here in Ireland,,, they go through the house radiators for heating,,, yours was not a clear comment sorry.

MrHottleaded: I have never fed a wood stove more than three times in a day.

Jason Shepperly: Power a small fan to direct your airflow and produce your desired effect with a turbine exaust power generator which is powered by the rising of air. Like a wind turbine or fan blades. it has to be metal though. This also will give you a chance to power small devices, like alarm clocks. You can put a light manure/hay mix at the very top of the exhaust, filtering the smoke, making it greener.

ahnamay: It's the "burn it" rap! :-)

spiritartman: What state are you in? Thanks!

glockman1727ak47: Fantastic upload! I am gaining a better understanding of rocket mass heaters. The book Rocket Mass Heaters By Ianto Evans and Leslie Jackson is very good.

David Kenworthy: great job on your video's, in my opion you should use schedule 40 pipe for the stove. best way to get free pipe is through your local power company there always chaning systems and only us that standard pipe.

Patrick Thompson: Cool
Rating:
wood stove + rocket mass heater = hybrid 4.8 out of 5

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wood stove + rocket mass heater = hybrid