I heat my house and cook on an extremely efficient woodstove.  It's operation
is totally passive, no fans, no batteries, no gizmos.  The key to it's
efficiency is limiting the primary air to just enough to gassify the wood fuel
then letting the draft pull in secondary combustion air which is distributed
by a hollow, perforated baffle plate directly above the fire.  Where this
superheated air is introduced, the wood gas burns much like the jets on a gas
stove.  It's rated efficiency is 69% under Oregon DEQ test conditions and it's
emissions do not exceed 3.4 gm/hr. www.pacificenergy.net
Simple, clean burning, and efficient are the principles which will succeed in
a third world country like where I live.
m--
>
> I don't think anybody has been talking about heating stoves in this
> thread except in passing. The original message commented on Robert's
> discussion of his commercial-product IDD woodstove (for cooking), a
> la Tom Reed. Very nice too but it uses a battery to provide power for
> a primary air-supply fan, so its application for 3rd World use is
> useful but limited. Without the powered fan these stoves are
> promising but not yet fully practical, and nobody has yet solved this
> problem, AFAIK.

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