ALL Power Labs: Tools for Power Hacking
gek assembled downdraft reactor rings reactor inside all plates cut

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GEK: Purchase Options (Note: as of February 2009, we're now delivering the GEK v2.1)

ALL Power Labs offers the Gasifier Experimenters Kit (GEK) at a variety of part counts and states of assembly. From "You build it from scratch" to "We deliver it complete"; you decide the relative amount of effort vs cost you want to invest towards your finished unit.

All GEK kits include relevant parts for a full gasifier system-- not just the raw gas making reactor. Most builders quickly learn that a wood gas unit is as much as filtering, cooling, vac/blower, burner and fuel feed system, as it is the core gas making reactor. The GEK kit is honest about the full range of difficulties, and doesn't leave you to discover these realities on your own later. All GEK kits include the following:

- gas making reactor
- fuel hopper
- gas/ash cowling
- cyclone
- packed bed filter
- vac/blower
- burner

What varies between different kit levels is how many of the detail parts we include and how much fabrication we contribute towards the final integrated unit. The end GEK is the same whichever route you choose to realize it. Thus all GEKs are comparable and solutions shareable between different users.

To fully understand the GEK system, be sure to take a look at the GEK general info page , gallery of GEK photos, and the growing collection of GEK performance reports. All GEK dimensions are on the downloads page. Instructions for fabricating, assembling and firing the GEK are in the GEK wiki sandbox . You can see how we manufacture, stock and ship the GEK in the Fab Shop and Shipping photo gallery.

Shipping costs are explained at the bottom of the page.

Kit Levels and Cost Parts Included

LEVEL IV: Everything Complete and Painted:

The Everything Complete Kit

The Level IV GEK kit arrives at your door with all fabrication completed, ready for you to assemble and run. Assembly on your end is minor, requiring only basic wrench turning, plumbing tape, and painting (if you choose the no paint option). There is no welding or other metal working required. Every detail part, down "to the last nut and bolt", is included for the full GEK gasifier system.

The Level IV kit also includes good temperature and pressure instruments so you can understand what is happening in your GEK, test out your personal configurations and customizations, and share the knowledge with others. The instrumentation package is pictured above and includes:

- two channel digital thermocouple reader (type K)
- two type K soft thermocouples, each 40" long
- one type K hard probe of 24" length, with handle (good Omega instrument)
- low pressure inches of H2O manometer to read vacuum. (we now include a dual column manometer instead of the pictured gauges. the gauges are too easy to clog.)

Support to run and improve your unit comes from a growing community of GEK builders/owners/experimenters. The formal Assembly and First Firing instructions are here. And Jim Mason is also always available via email and phone to help if things get confusing.

All Parts, no welding

All vessel tubes, flanges and endplates, + plumbing, hoses, blower/vac, instrumentation, and other details.

The Level III kit includes all the rolled tubes, flange rings and end plates needed to make all vessels, as well as all accessory parts required to complete the full GEK gasifier system. The Level III kit is identical in parts to the Level IV kit, just all the welding is left for you to complete. This will require a MIG wire feed welder and modest welding skills.

All the sheet metal parts are precut on a CNC plasma table and professionally rolled. You receive a kit that fits together easily and accurately, without any additional cutting or grinding. Nonetheless, expect about 3 full days of work to weld together the vessels. 2 more days for other assembly details.

The Level III kit includes many accessary parts past the obvious plumbing needs, as well as the temp and plumbing instruments listed above.

Plumbing and Accessories:
- plumbing to make air inlets and nozzles
- stainless steel air preheating / gas cooling tubes. 6' long.
- ash handling mechanical parts
- gas cowling legs
- output gas plumbing
- cyclone and filter plumbing
- centrifugal vac/blower and motor
- 8' soft hose to burner
- burner nozzle and plumbing
- hose clamps
- filter packing
- gasket material
- pipe tape
- nuts and bolts
- etc etc.

- two channel digital thermocouple reader (type K)
- two type K soft thermocouples, each 40" long
- one type K hard probe of 24" length, with handle (good Omega instrument)
- low pressure inches of H2O manometer to read vacuum.

See the GEK wiki sandbox for the complete fabrication instructions.


All Sheetmetal

Full sheet metal kit: All vessel tubes, flange rings and end plates

For those short on money, but still wanting a quality end product, we enourage you to resist the temptations of the full "build it from junk" route, and at least start with a full CNC plasma cut sheetmetal vessel kit. The Level II kit gives you all the tubes, flanges and end plates you need to build all component vessels. The full sheetmetal kit greatly simplifies the building process vs scrap tanks, while increasing the accuracy and impress of the finished product.

You will still have to source all the plumbing parts, gaskets, motor, fasteners, instruments, etc to build it. The list of additional needed parts is here. Sourcing these remaining parts will likely cost you more in money and certainly more time in hassle than just gettting it all together as a Level III or IV kit. But some like to do it the hard way, thus we continue to offer the Level I and II kits. For everyone else, we encourage you to choose the Level III or Level IV kit above.

Scrap Tank Kit


Flanges and End Plates. No vessel tubes
(You provide scrap tanks)

For those who have very little money, and insist on doing it the really hard way, we offer the following:

You can build your GEK for minimum money (and maximum effort) from scrap tanks and the above flange and end plate kit. GEK vessel dimensions are based on common propane and air tanks found in North America, so the same flanges and end plates will work for an "obtainium" build as our purpose manufactured vessel tubes described in Level II-IV.

For the "build it from junk" route, you will need scrap tanks of 10", 12" and 14.75" diameters. 10" is typical for hand held air transfer tanks and some truck pony tanks. 12" is typical for 5 and 10 gal propane tanks. 14.75" is typical for a 100lb/25gal propane tank. (Warning: There's a surprising amount dimensional variation on "standardized tanks" between different tank manufacturers. This can complicate the fit of flanges and end plates to the scrap tanks.)

You fight the grease, rusted in valves, and smelly impregnated gas, then cut the tanks apart (taking care to avoid unwanted internal combustion), and weld on the above flanges and end plates. You will still have to improvise for the cyclone, filter, blower, burner and hopper.

Full dimensions on the download page here. Fabricating instructions are in the GEK wiki sandbox.


Individual Components and Parts

Fan Kit:

aw and unwelded sheetmetal pieces, three speed fan motor

Welded and painted sheetmetal fan assemly, three speed fan motor,

The vac/blower is a long-standing difficulty for the DIY gasifier builder. There is no good equivalent from other industries that shows up as obtainium. Thus we built one and now offer the same to you in a variety of states of assembly.

This vac/blower kit is a proper high rpm centrifugal fan that will generate the needed 5-10 inches of h20 vacuum (a typical squirrel cage will only generate 1" of h20 vac). All metal construction will take the heat. No more melting shop vacs and/or mom's hairdryer. The motor shaft is well protected and sealed to avoid tar fouling.

The intake is 3" in diamter. The output is a 2" sch 40 pipe nipple, threaded. The rotor is 7.5" in diameter, with a 5/16" shaft collar to accept the motor. The internals are configured so that gas can pass through the fan housing without constriction when the fan is not running. Thus you can put it inline with your gas piping and avoid the separate valved branch circuit. See more detailed pictures in the gallery.

The optional motor is a 12vdc three speed motor (2800, 4000 and 7500rpm).

Cyclone Kit:

Rolled sheetmetal pieces,
no welding, $79

Welded and painted, $149

This is the standard 5" diameter cyclone from the GEK kit. It comes with a 2" box flange attachment at the inlet, and a 2" threaded NPT nipple for the outlet. A glass Mason jar and adapter is included for the particulate/condensate/tar catch.

(Note: picture has 2" NPT nipple with union at the inlet. This method was replaced at v2.0 with a square sheetmetal tube and flange plate. See pictures in gallery.)


Orders can be placed using the "buy now" buttons above, or via check to:

ALL Power Labs
1010 Murray Street
Berkeley, CA 94710

All prices are freight on board, Berkeley, CA, 94710. California sales tax of 8.75% applies to all orders within California.

Questions? Contact: gek_at_allpowerlabs_dot_org



Domestic shipping is via UPS ground. Level III or IV kits are $150 and $200 to ship respectively anywhere in the United States. Shipments to BC Canda are the same rate. Eastern Canada is a bit more. Write us and we can quote specifics.

International shipping is via UPS air freight, with a 5-7 day delivery. It is often faster than our domestic deliveries, surprisingly. In general we can ship to Europe for US$399; India, Australia, Noth Asia, Southeast Asia, and South America for $550; and Africa for around $700. Canada is regular UPS ground. GEK units can also be picked up at the shop in Berkeley, California.

All sheetmetal vessel tubes "Russian Doll" into themselves, and then into the GEK hopper (a 30gal open top drum) for ease of shipping. You can see the particulars of the stocking, packing and shipping here.


The weight for each kit level is appoximately:

Level I: 50 lbs
Level II: 100lbs
Level III: 165lbs
Level IV: 175lbs