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Hi folks!  We lived with this lovely heater for 4 years and can personally recommend the design!

To purchase the plans, please click your choice of payment below.
Once you have made your purchase with pie or Paypal, you will find a link at the bottom of this post. Click to download, and that's it!



$19.95

Rocket Mass Heater Plans: Annex 6" L-shaped Bench by Ernie and Erica
Buy access to this content
Seller Erica Wisner




This project also has been featured in a lot of free, online articles:
The fun we had working our way through the permitting process in Portland, Oregon, article on our website HERE

Free video that includes process photos from building this heater (one hour video presentation, we show the Annex 6" building process from 40:00 to the end).



If you already got these plans from us, and have built a rocket mass heater using these plans, we'd love to see your photos and project stories here too!  

Thanks,
Erica W

Full description:

Annex 6" Heater Plans

An L-shaped heated bench, using the rocket mass heater clean-burning and super-efficient wood burning technology. The '6' refers to diameter of heat-exchange ducting.
This design provided the sole heat for an older Portland cottage/apartment of about 800 sf. Over 4 years, we used less than half a cord of salvaged wood per year (local arbor trimmings and building debris). We ran the fire 2 to 4 hours in ordinary cool, rainy weather, and up to 6-8 hours when the weather dropped below 20 F, for constant 24-hour warmth. In summer, the earthen bench was not heated, and instead helped keep the house cooler than it had been in previous years with no need for fans.

The document prints letter format 8.5" by 11, or 11" by 17", six pages including photos; scale drawings of the floor plan, elevation, and sections; a cutaway view; and builder's notes on the construction process.

These are as-built drawings for information only; no guarantees or licenses implied. References to ASTM standards and building codes are included to help prospective builders research local building requirements.

COMMENTS:
 
Posts: 3
Location: Penns Valley PA
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Thank you agaain!
 
Posts: 51
Location: North-Central Minnesota
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I bought the plan on PayPal and it brought me to this page and the download worked.  So now I have another copy.  Hope the funding part worked on the front end for ya', Wisners!
 
gardener
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Thanks Jami!

I just found an older thread showing some early drafts of diagrams from these plans, HERE.


This diagram shows the "snapshot" version, which we used to illustrate the stove for our Portland permitting efforts.  We also used this diagram as the base for several illustrations in the first chapters of our Builder's Guide.
The full plans include a finished version of this diagram, and several more blueprint-style drawings for top view, side views, and details.



This was the first heater project Ernie and I built in our own home, just after we got married, so it has some good memories for sure!  
We only slept on it ourselves for a few days, during an extreme cold snap, but we had a lot of happy, cozy guests that "couch-surfed" during those 4 years.  

(Not all of the guests who slept on it had intended to spend the night.  We had one particular pair of friends with stressful jobs who would come over for dinner, we'd sit down for a drink and conversation afterwards, and he would just melt on the bench and fall asleep on her shoulder.)

-Erica
 
Jami Gaither
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Ah, what great stories!  We just showed our Clay to a friend yesterday and have more people interested.  Hopefully we'll be building some more RMHs soon.  Thanks again for all you do!
 
Erica Wisner
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Jami Gaither wrote:Ah, what great stories!  We just showed our Clay to a friend yesterday and have more people interested.  Hopefully we'll be building some more RMHs soon.  Thanks again for all you do!



Pictures!!! (next time you get a chance?)

Love,
E
 
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Hi guys,  I keep getting a link for the "Rocket Mass heater Plans: Annex 6" L-Shaped Bench (https://protect-us.mimecast.com/s/AQFbC5ylL2tZVyAAuzZbzx)" but it keeps telling that it is an invalid link.  Can someone help?

 
master steward
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Posts: 95
Location: NE Oklahoma
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Ernie and Erica,
Thank you both so much for providing this material to the BWB backers.  You're generosity and willingness to help spread the word about this technology is very much appreciated.
Have a great day!
 
Posts: 35
Location: Zone 5B, NB, Canada
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Thank you very much for the free plans. This will be a fun project for my work shop!
 
Posts: 50
Location: Whitehorse, YT; hardiness zone 1b (Can)
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Thank you for the free plans. I've printed them out and want to really understand how to build a rocket stove.
 
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From a chilly South African high veld, thank you for the fantastic work you are all doing.   While my own garden in  a residential complex is tiny, so much information can be adapted, and providing efficient heat is marvelous.  Many kind regards.
 
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Thank you so much folks. My wife and I would like to build a couple of these RMHs in our home. If and when, I will try to document the builds and post some pics here on Permies. {:^)>
 
master pollinator
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Thank you! I'm only just starting to learn about rocket stoves, will buy the book soon.
 
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Thank you so much! I've been waiting and praying for this and it actually arrived today on my birthday!

Lord Bless You!

RachelDLS
 
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Thanks for this great resource! We will be building our first RMH this year and are hoping for a similar design, though we'll have a U-shape instead of L-shape.

One question on exhaust pipe length: Would it be feasible to have the exhaust pipe run through the RMH only once (instead of back & forth as in this design), and then exit vertically through our roof? Is there a length of exhaust pipe limitation due to heat/speed of the exhaust? We have a loft above the RMH and are wondering if we should design the pipe to pass through the loft to use that heat... or if there won't be any heat left by the time it travels through the RMH and then up 8' of pipe.

Thanks!
 
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This is incredibly useful, Thank you. I am in love with rocket mass heaters.
 
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Thank you!
 
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Thank you, I am planning to use this idea to heat my greenhouse when I get it up
 
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Hi! I'm very embarrased, but I hit subscribe by accident. I did plan to subscribe but this wasn't the freebie I necessarily was going to choose. Any way to get a do-over?
 
Nicole Alderman
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Alex Heron wrote:Hi! I'm very embarrased, but I hit subscribe by accident. I did plan to subscribe but this wasn't the freebie I necessarily was going to choose. Any way to get a do-over?



Hi Alex! I sent you a PM!
 
Posts: 184
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THANK YOU!!!
CE3C2C86-69A2-4C0D-A55D-CF57687D0106.jpeg
[Thumbnail for CE3C2C86-69A2-4C0D-A55D-CF57687D0106.jpeg]
 
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Thank you.  This info is food for the mind, body and soul.

 
Posts: 31
Location: Zone 8: hard clay soil
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Thanks for the free download but I can't seem to view it. It won't convert to my docs app, in my pdf app it is blank and on the html viewer it shows html coding. Does anyone know how I should open this? Also will the download stay on my goodies page?
 
pollinator
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I don't know if it will ever be possible for me to have a RMH ... But I will keep this Freebie in my files, for 'if ever ...'
 
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Location: San Diego, CA
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Thank you for the down load.
 
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TY for sharing these with us. Looking over the intro it said this heater was used for 3 years and seemed to help keep the house cooler during summer heat waves.  I wonder if anyone could post an explanation of how/why that works?
 
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Hi,
I would like to know if, instead of using pipes as ducts in the mass, if the ducts can just be fabricated with adobe(cob). If the wall are made thick enough would the hold and not leak hot air?
 
Posts: 54
Location: Saskatchewan, Canada
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Kees Lugtenaar wrote:Hi,
I would like to know if, instead of using pipes as ducts in the mass, if the ducts can just be fabricated with adobe(cob). If the wall are made thick enough would the hold and not leak hot air?



In my opinion, short answer: yes, long answer: is it worth it?
I believe it to be possible to build a RMH with mostly airtight cob ducts, but the work would be enormously tedious.  Stacked stones along the sides and larger stone caps would be a more structurally sound option.  The ducts would probably have to be built end to end, rather than bottom to top.  This would allow easy access to shape and smooth the interiors.  Any cracks that might develop later could be filled with clay slip.  Future cleaning could damage the walls and any collapse could ruin the efficiency or stall it out.

Several cultures use clay pipes for plumbing and ventilation.  The Roman hypocaust system used the subfloor and walls for the flue gasses.
I think using existing glazed clay pipes would be a much better, but not cheaper, option.  An option for an outdoor RMH is laying all the ductwork using cardboard tubes and taping the joints during construction then, starting at the exhaust end, burn the tubes out.  That will remove the tubes and also partially vitrify the clay, helping to stabilize and seal the ducts.  I have been wanting to try this very technique for a while and I hope to get to it in the summer.

A major concern would be the building codes and insurance depending on where you live and the location of the RMH
 
Kees Lugtenaar
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I like the idea of firing the tubes before use... Gonna try that.
But meanwhile to many projects before this one.
Thanks.
 
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