African Clean Energy has developed the ACE 1 Ultra-Clean Biomass Cookstove, which burns fuel cleanly. Our new cookstove uses gasification to burn almost any type of biomass. For more information, visit:

IWA tiers of performance
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Indoor emissions
Information for consumers
Maximum pot capacity
70 L
Approximate lifetime
12 years
People fed per meal
not available
Pot type accommodated
(Flat bottom/Round bottom)
Countries deployed
Cambodia, Kenya, Lao People's Democratic Republic, Lesotho, Netherlands, South Africa, Uganda, Zambia
Common foods cooked
In Africa it is the maizemeal porridge which in Lesotho is called Papa. In Asia, people cook rice and vegetables on it, or various stews. We've also discovered that with a clever grill or griddle top it is also very handy at preparing meat and fish.
Manufacturer's warranty available?
Warranty details
There is a 1-year warranty. ACE also anticipates that certain integrated distribution projects (those including fuel sales, and possibly carbon or ADALYs) will be able to supply lifetime warranties.
General information
Manufactured in
Suggested retail price
not available
On the market
Dimensions (l/w/h)
330/330/350 mm
4.6 kg
Shipping dimensions
not available
Shipping weight
5.2 kg
Local assembly possible?
Materials needed for local assembly
We offer a flatpack shipping option, which means the stoves can be sent in parts, saving substantially on logistics costs. The first shipment can come with the tools necessary to finish assembly, supporting the set up of local production lines.
Includes instructions?
Other information
A fan blows oxygen into the chamber through holes at both the bottom and the top. This drives the fire to increase in temperature until it reaches approximately 1000°C. These conditions cause the biomass to gasify. Then the hot gas floats up to the top, meeting more oxygen and combusting completely. The stove will produce as much as 5kW worth of energy, and the outside temperature, though warm after continued use, does not become hot enough to cause injury. When fully charged, the battery will power the fan for over 20 hours of cooking. The battery can also be used to charge a mobile device or run LED lighting, and can be boosted using a solar panel.

Fuel Consumption:
  • Full fan: 750 grams (8mm pellet) in 50 minutes.
  • Low fan: 750 grams (8mm pellet) in 100 minutes.
  • LiFePO4 6.4 V / 5 Ah.
Charging time:
  • 3 hours of cooking ≈ 1 hour of charging
  • Solar panel charging time may vary according to exposure to sunlight
Optional accessories:
  • LED unit: 100 – 125 Lumens/Watt: 66 Lumen and 132 Lumen units to be available. DC jack 2.5/5.5, positive centre pole.
  • Solar panel: 9V 5W frameless PET unit, unregulated (regulator integrated into the stove). 4 meter cable. 2.1/5.5 DC jack, positive centre pole.
  • Powder coated mild steel base, Stainless 304 body and inner, 20mm refractory ceramic tiles in the burning chamber, mild steel pot rest top.
In The Box:
  • ACE 1 Ultra-Clean Biomass Cookstove, Instructions. (Optional: Solar Panel, LED light)
Non-traditional, Household, Portable, Gasifier (TLUD), Ceramic-lined, Fan
Crop residues, Dung, Pellets
Performance details
IWA emissions  
Metric Min value Max value Number of tests
IWA high power CO 0.82 g/MJ-del 0.82 g/MJ-del 1
IWA high power PM 101.1 mg/MJ-del 101.1 mg/MJ-del 1
IWA low power CO 0.019 g/min/L 0.019 g/min/L 1
IWA low power PM 0.84 mg/min/L 0.84 mg/min/L 1
IWA efficiency  
Metric Min value Max value Number of tests
IWA high power thermal efficiency 41.5 % 41.5 % 1
IWA low power specific consumption 0.027 MJ/min/L 0.027 MJ/min/L 1
IWA indoor emissions  
Metric Min value Max value Number of tests
IWA high power indoor CO 0.023 g/min 0.023 g/min 1
IWA low power indoor CO 0.075 g/min 0.075 g/min 1
IWA high power indoor PM 7.91 mg/min 7.91 mg/min 1
IWA low power indoor PM 3.33 mg/min 3.33 mg/min 1
Efficiency, energy consumption and fuel use
Metric Min value Max value Number of tests
Fuel consumed 247.0 g/task 800.0 g/task 2
Metric Min value Max value Number of tests
BC emissions factor (2) 0.68 g/kg fuel 0.68 g/kg fuel 1
PM2.5 emissions factor (2) 4.3 g/kg fuel 6.1 g/kg fuel 2
CO emissions factor (2) 46.0 g/kg fuel 56.3 g/kg fuel 2
PM2.5 emissions rate 32.0 mg/min 93.6 mg/min 2
CO emissions rate 0.34 g/min 0.81 g/min 2
OC emissions factor (2) 0.5 g/kg fuel 2.0 g/kg fuel 2
CO2 emissions factor (2) 1744.8 g/kg fuel 2276.0 g/kg fuel 2
CO2 emissions rate 17.0 g/min 27.38 g/min 2
EC emissions factor (2) 1.3 g/kg fuel 1.5 g/kg fuel 2
EC emissions rate 10.0 mg/min 19.3 mg/min 2
OC emissions rate 1.5 mg/min 19.3 mg/min 2
CCT/UCT metrics
Metric Min value Max value Number of tests
Specific consumption (fuel) 83.0 g fuel/kg food 83.0 g fuel/kg food 1
Time to cook food 41.0 min 41.0 min 1
Safety metrics
Metric Min value Max value Number of tests
Sharp edges and points rating 4.0 4.0 1
Cookstove tipping rating 4.0 4.0 1
Containment of fuel rating 4.0 4.0 1
Obstructions near cooking surface rating 4.0 4.0 1
Surface temperature rating 4.0 4.0 1
Heat transmission to surroundings rating 4.0 4.0 1
Temperature of operational construction rating 4.0 4.0 1
Chimney shielding rating 4.0 4.0 1
Flames surrounding cookpot rating 3.0 3.0 1
Flames or fuel exiting chamber rating 4.0 4.0 1
Total safety score 97.0 points 97.0 points 1
Test Conditions Metrics
Metric Min value Max value Number of tests
Weight remaining char 71.0 g 71.0 g 1