Paul Olivier, April 2010

Today we put in operation for the first time the 250 gasifier with a stove top.
This gasifier has a single 2-inch pipe that vents housing air to a warmer grate.
This pipe had no butterfly valve or other restriction.
We used the same small 80x80 mm fan as in the 150 gasifier.
This fan had no problem at all supplying air to the reactor and to the 2-inch pipe.
The burn lasted almost an hour on rice hulls, even though the height of the reactor was no more than 70 cm, the same height as in the case of the 150 stove.
The warmer grate had sufficient heat from the housing to fry an egg, as indicated in picture 855.
We obtained a bright blue flame, as shown in picture 865,
although the camera did not have the right lighting to display it properly.
The stove top was not properly reinforced when a large pot filled with water was placed on top.
There was a deflection of a few mm's.
However this can be easily remedied with two more lateral braces underneath the stove top.
In conclusion, the 250 gasifier works well and delivers an enormous amount of heat.

[MAGH OPEN STOVE]( is an institutional fixed woodgas stove. This stove is useful for cooking needs of up to 100. With primary and secondary air controls it is easy to operate and highly efficient. For making this stove, "Magh CM" stoves are used inside. This stove is installed at "Open House", Hyderabad, a place for destitute youth for cooking their own food, shelter, studies, etc. Implemented under the "Good Stoves and Biochar Communities" Project, Implemented by GEO with support of France. Stove design by Dr. N. Sai Bhaskar Reddy. For more details visit

[MAGH 3G]( ) is an adaptation stove. All types of biomass, briquettes and charcoal can be used for cooking. This is an all in one stove.

It was found that many families have at least two or three types of stoves in rural areas for using types of biomass as fuel. Now with just one stove they have the freedom to use all types of Biomass as fuel.

There is an option to control primary air, to control air from the fuel feed side opening, and secondary air (while using TLUD adopter). Weighs less than 2 kgs, 9 inches in height and 7 inches diameter. Most convenient for regular use, travel, relief, refugees, etc. Reusing metal sheet, these stoves are completely hand made. The cost of each stove piece is $5 (USD).

This stove is being facilitated under the "Good Stoves and Biochar Communities" Project, implemented by GEO with the support of This is one of the 40 stoves designed by Dr. N. Sai Bhaskar Reddy, GEO . For more details visit

Introducing the eco-Kalan in the Philippines
Rebecca Arrieta Vermeer of Dumaguete City, Philippines

What is an eco-KALAN?

An eco-KALAN is a portable stove made of clay consisting of three components: the outer shell (kalan) on which the cooking pot sits; the inner chamber (rocket elbow) where the combustion takes place; and a shelf with air holes to hold the fuel. The space between the kalan and the combustion chamber is filled with wood ash for insulation.

See the eco-Kalan Story


Feeding Program at South City Elementary School, Mangnao, Dumaguete City, Philippines

Pilot Lunch Program for 40 school days in Dumaguete City, Negros Oriental, Philippines starting on January 11, 2010. Program is funded by the Philippine Government and administered by the Department of Education.

Introducing the Eco-Kalan-C and Eco-Magic Box to the Lunch Feeding Program.

This video demonstrates how to build an Eco- Magic Box; and how to use the Magic Box and the Commercial (C) Eco-Kalan in the Lunch Feeding Program at South City Central School in Mangnao, Dumaguete City, Negros Oriental, Philippines.

Avocado Eco-Kalan Presentation, February 19, 2010.
Avocado is a mountain community in the town of Sta. Catalina, Negros Oriental, Philippines. Donors from British Columbia, Canada are Kees & Rebecca Arrieta Vermeer and the Chilcotin Log Church. Avocado is unique in that it was and continues to be a base for insurgencies by the New People's Army.

The projects are supported by non-profit organizations in British Columbia, Canada.

Stove development has been in collaboration with Nate Johnson and Mark Bryden of Iowa State University and Sebastian Africano of Trees Water and People and Aprovecho Research Center.

Nice article about the positive impact of improved cooking stoves in Pakistan. It's important to note that they are building the stoves themselves out of local clay, and it is making a positive and immediate difference in the reduction of smoke and the amount of wood used. I'm not sure what type of stove is being used.

Qpre, India March, 2010

More information on their web site :

Alexis Belonio, Tran Binh, Doan Thi Minh Nguyet, and Bui Dinh Hai
VINASILIC SJ, Socialist Republic of Vietnam and Center for Rice Husk Energy,
Philippines January 24, 2010

[Magh CM Laxmi [MCL]]( "MAGH CM LAXMI WOODGAS STOVE") is a Natural draft woodgas stove. It is a modification of [Magh CM ]( convenience of using all types of Biomass as fuel.

In many villages power is rarely available or available for few hours. In such a situation peoples' priority is for Natural draft stoves as compared to forced air stoves. The control on feeding fuel to the stove is another aspect, which people prefer. And more importantly the community wants freedom regarding the type of fuel to be used. They dont want to have stoves for different types of fuels, as they cannot afford as many stoves as types of fuels.

Magh CM Laxmi evolved from Magh CM. One of the user of Magh CM Ms. Laxmi, Peddamaduru village, has removed the fan and started feeding the sticks from side openings. She is able to use this stove with wood shavings and the sticks. She could use this stove for large scale cooking (12 members), during one of the festivals without any problem.

Keeping in view the adoptation factors and convenience of cooking MCL design is finalized. In honor of Ms. Laxmi the stove is named as [Magh CM Laxmi (MCL)]( By increasing the height of the stove (chimney effect) the soot has been reduced.

Apart from using sticks, it is also convenient to use woodshavings / pieces of wood / leaves / dung balls / dung cakes / pellets / any small pieces of biomass fuel through the elevated side feed tray (its inclination can be controlled for fuel to slide down into the combustion zone).

In both Magh CM and Magh CM Laxmi the design enables the user to control the flames in the stove through primary air control shutter, convenience of removal of biochar. This stove costs about $6. For more information on [[Magh series stoves]](

Yvonne Vögeli and How to Build the ARTI Compact Biogas Digestor, January 2010

Lively discussion on the Digestion discussion list has

Building instructions, posted on HowToPedia:
How to Build the ARTI Compact Biogas Digestor (also see the attached pdf).

Recent studies analyzing the effectiveness of this system have generously been provided by Yvonne Vögeli with Eawag / Sandec. Thier work is summarized here: Anaerobic Digestion of Organic Solid Waste


For additional information, take a look at our earlier article: Compact Biogas Plant - Compact, low-cost digester for biogas from waste starc


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