Wild Stoves technical response
There are 2 ways of addressing this question: from a practical perspective (how they perform in the field in practice) and from a lab-data perspective.
- all models are high quality double-walled woodgas stoves and burn cleanly using similar principles of preheating secondary air
- the LE and Wild WGS are likely to be fairly similarly powered (around 3kW), being of similar size, though it's likely the LE has the slight edge as the forced air causes it to burn slightly more vigorously
- the XL is approx 3.6kW.
- the LE and Wild Woodgas have similar-sized combution chambers so take a similar amount of wood. The LE is likely to burn through its wood slightly quicker due to the forced air; while the Wild WGS is slightly gentler so the wood should last longer. The actual amount of heat delivered over the burn probably varies little.
- the LE and XL will not burn without the batt pack attached / with flat batteries; the Wild Woodgas requires no batteries for optimum performance.
Secondly, from a theoretical & research perspective:
- turbulence generally increases the quality of combustion (and therefore efficiency) and the LE and XL have the edge here as they inject air into the base of the chamber and inner top edge. However, the passive air flow on the Wild Woodgas and other passive stoves (like the Bushbuddy) is remarkably effective - as evidenced by the 'jets' of yellow flames emerging from the air holes.
And finally a little general info on Woodgas stoves...
There are a few publications comparing the performance of many different stoves available, including the Test Results of Cookstove Performance (2011, Aprovecho Research Centre). This shows that wood gas stoves:
- produce just 22% of the carbon monoxide compared with an open fire (compared with a rocket stove which produces 26%)
- produce a fraction of particulates (basically smoke) of an open fire - just 15% - a reduction of 85%! (Rocket stoves reduce particulates by around 40%)
- Are the most efficient kind of wood cooking stove tested, beaten only by alcohol and propane stoves.
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