Firespeaking

Masonry Heaters, Wood-Fired Ovens, Natural Building

Feb
07
2017
0

The Shop Cabin Stove

The Shop Cabin Stove is another iteration in Firespeaking’s development of The Cabin Stove, essentially a wood-fired masonry cookstove that offers both quick heat and retained heat, cooking facility and is easily integrated into kitchen and home design.  Its dimensions are 24″ (w) x 44″ (l) x 36″ (h). There are channels inside the brick work which provide for a long passage way for the heat generated.  This means that the stove both produces immediate as well as retained heat.

We designed and produced this cooktop. Cooktop fabrication is an exciting area we are working on. The few imported cast iron options do not allow for the level of design integration and flexibility that we would like. Contact us if you would like us to develop a cooktop for you.

The bi-pass damper is mounted to the bottom of the cooktop. It’s generally nice to have a bi-pass damper on cookstoves so you can start it up easily and choose not to load the mass with heat on warmer days.  They can be awkward to position and difficult to mount in a durable way.  We are very happy with this solution.

The UPO cast-iron door is set into an air frame.  We drilled and tapped over 70 half inch holes on the sides and top to be able to study the best method of injection of air into the firebox.

Here you can see a couple of constructive details that could lead to future possibilities.  You can see a sample of the simple cleanout frame and door we have developed to service horizontal and vertical turn-around runs.  The two holes you see were made to accommodate the connection to a thermosiphoning hot water heat exchanger in the firebox.  I have since decided that incorporating the hot water collection into the flue will probably be the best option.  You can also see that we built the base with a stacked bond and lintel so that it will be easy to add a heated bench.  I will be very interested to see how this addition affects performance.

It is invaluable that we have finally been able to build one of our wood-fired creations for ourselves.  Our shop is 600 sq. ft.  Three walls are well-insulated but the fourth has two large uninsulated garage doors.  The whole shop sits on a thick concrete slab.  I include this photo to show that a fan is helpful in distributing the heat generated at first.  A thermo-electric fan would be a great solution. Our experience is that most of the heat felt is coming off of the top for the first two hours but then the mass begins to radiate and emits an amazingly comfortable warmth for the proceeding hours, even after the fire has gone out.  My experience so far leads me to conclude that this iteration of the Cabin Stove would heat decently insulated spaces between 200-600 sq. ft.  Perhaps larger buildings that were very well detailed.

Folk life around the stove!

Next steps:

Written by Max in: Cabin Stove,Masonry Heaters,Portfolio |
Feb
09
2016
0

Cabin Stove Videos

Links:

Written by Max in: Cabin Stove |
Feb
09
2016
0

Cabin Stove Contact Form

Please initiate all email correspondence regarding the Cabin Stove via this form. You can also reach us at (541) 688-0948 during normal business hours (Pacific Standard Time).

 

 

Written by Max in: Cabin Stove,Forms |
Feb
04
2016
0

The Cabin Stove at Rob and Mal’s

The Cabin Stove at Rob and Mals

This heater was built as part of the Sustainable Shelter Workshop Series at Aprovecho.  It completely turned around the residents’ experience of their home in winter time.  Their previous propane heater provided a “wet” heat that also didn’t reach the outlying bedrooms causing mold issues.  The design is a Cabin Stove with heated bench.  The design borrows from both the tradition of masonry cookstoves as well as the modern phenomenon of rocket mass heaters with heated cob benches.

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Links:

Written by Max in: Cabin Stove |
Feb
04
2016
0

The Harlan Cabin Stove

The Cabin Stove @ Harlan

The Harlan Cabin Stove was built during a two-day workshop in December 2015.  While I am very happy with it architecturally, it is an iteration of the design that shows it still needs some fine tuning.

I suspect that we need to tighten the gap beneath the metal of the cooktop in order to get more heat to rub off on the cooktop and provide immediate heat.  Also, it is likely that reducing the thickness of the cook plate from the current 3/8″ to 5/16″ or 1/4″ will provide more response.

This iteration demonstrates that the so-called “Sidewinder” combustion box still needs tweaking.  There is a lot of mass around the fire before it hits the cooktop.  Using insulative refractory materials out of the wear zone is one possible improvement.  Burning wood in our current wood stove at home as well as a recent repair on a state of the art German kacheloven firebox is solidifying my understanding of the differences between an underfire “oxidizing” air source and side and over-fire air which is good once gasification has been reached.  Our next iteration will be in our own shop and I will try to combine both elements.  Stay tuned.

The complete masonry plans for this stove are currently offered for sale as The Cabin Stove Plan Set.  As this is an open-source development project, the price of the plans actually serves as a pledge of support in helping us to continue to develop this “cookstove” / “masonry heater” hybrid.  You can think of a purchase as helping to buy bricks, coffee and welding wire for the next iteration we will build and to have time to document step-by-step photos.  Go for it!

Links:

Written by Max in: Cabin Stove |
Nov
22
2015
0

Cabin Stove Workshop – Dec. 5-6 – Harlan, OR

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HOW TO BUILD A COMPACT, WOOD-FIRED MASONRY HEATER

Learn to build a compact wood-fired masonry heater designed to maximize heat gain from minimal amounts of fuel. In this intensive two-day workshop, we will show you, brick by brick, how we build a small, efficient stove that combines space heating with cooking capabilities. We will also cover basic theory of combustion and retained heat, stove designs, hardware, permitting, theoretical and some hands-on masonry (including sourcing and mixing mortar and other materials, cutting brick w/out a saw, keeping things plumb and level, basic brick-laying, etc.)

The masons leading the workshop are Max Edleson, a professional heater mason (see his portfolio here), and Kiko Denzer, a DIY mason, teacher, artist, and author (handprintpress.com/kiko). The heater will be installed in a small cob cottage on a family ranch.

Like much larger (and more expensive) masonry heaters, the Cabin Stove burns so clean you won’t see any smoke coming out of the chimney (except at startup). As it burns, heat travels through yards of masonry channels, heating up many hundreds of pounds of brick. All that brick works like a battery — once charged, it will keep you warm and comfortable for many hours. In the cold season, one or two small fires per day is all you need to heat a small building (the design can be adapted to heat up to about 1,000 square feet of an open plan building). More information about the “Cabin Stove” is available here….

The workshop takes place on December 5th and 6th, in a beautiful valley on a salmon creek, about 45 minutes west of Corvallis, OR, with primitive facilities. Enrollment for this two-day course is limited to 5 people at $150 each, pre-paid; if you’re serious about building your own stove please get in touch. Some scholarship funding may be available.

Written by Max in: events |
Sep
24
2015
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The Cabin Stove Plans

Important: this is a work in development!  By purchasing this plan set, you not only get detailed plans for the Cabin Stove and insight into innovative masonry heater design, you also support our efforts at further development of the concept.  Included, you will receive important updates by email and have access to the latest version of the plans within this edition.

What’s Inside

• An Introduction
• Making Pretzels Out of Chimneys
• The Patterns
• Process
• A Word About Safety (in the Context of Innovation)
• The “Sidewinder” Combustion Chamber
• Plans for the “Sidewinder”
• Plans for the Cabin Stove
• Plans for the Cabin Stove with Heated Bench
• Direction Forward & Feedback
• Acknowledgements

The document is currently 19 pages: 6 pages of text, 8 pages of schematic and course-by-course drawings, 1 page materials and cut list for combustion chamber and 2 pages of photo construction details.

Links:

  • The Cabin Stove – general page about this model’s development
  • The Cabin Stove Contact Form – please address email correspondence regarding pre-purchase and post-purchase follow-up questions via this form (eg. if you do not receive your pdf link right away.

Project Map:

  • Build a Cabin Stove in our shop
    • modify firebox
    • include water heating options
    • experience daily use first-hand
  • Put out a second version of the plan set with updates, materials schedule and budget worksheet.
  • Build an iteration at Masonry Heater Association Annual Gathering.
  • Keep developing open source hardware and documentation.
  • Documentation of experiences & advancement.

 

Written by Max in: |
Sep
16
2015
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The Cabin Stove

The Cabin Stove is a compact wood-burning stove for heating and cooking. It uses a mix of clean, efficient combustion, and heat exchange strategies, which provide both immediate heat via the cooktop as well stored heat through the channels inside the brick work. Effectively, it converts wood into warmth and good food.

The Cabin Stove at Rob and Mals 

This cookstove is a hybrid between rocket mass heater and masonry heater technologies that has precedents throughout the world, especially in Europe. While it embraces many aspects of rocket mass heater design, one of the main differences is that it substitutes the barrel-style heat exchanger for a flat metal cooktop which makes for a compact footprint.  It also includes a batch-style firebox which is characteristic of masonry heater and newer rocket mass heater designs.

Cabin Stove Videos:

Project Map:

  • Build a Cabin Stove in our shop (February 2016)
    • modify firebox
    • include water heating options
  • Put out a second version of the plan set with updates, materials schedule and budget worksheet (March 2016).
  • Build an iteration at Masonry Heater Association Annual Gathering in April (April 2016).
  • Keep developing open source hardware and documentation (2016, 2017).
  • Documentation of experiences & advancement (ongoing).

Design History:

Cabin Stove Hardware:

More Design Background:

Written by Max in: |
Sep
14
2015
0

Cabin Stove Hardware

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Written by Max in: Products |
Feb
10
2015
0

Testo Results of Cabin Stove 2.0 Prototype

Here are some initial Testo results of the original Sidewinder we built in the shop.  The build as well as some insight  of Mathew Walker’s on the data is documented at the original Cabin Stove 2.0 post.  We mostly share this as an example of more testing we hope to do.

Click to enlarge

Click to enlarge

Written by Max in: Cabin Stove |

Firespeaking - 89242 Fir Butte Rd, Eugene, OR 97402 - info (at) firespeaking.com - (541) 688-0948 - OR CCB# 200122