Firespeaking

Masonry Heaters, Wood-Fired Ovens, Natural Building

Cabin Stove

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:

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).

 

 

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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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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!

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