Here is some information about the Lorena woodburning stove design.
Pros: It uses very little firewood and burns very efficiently and when the exhaust pipes are clean with little smoke near the person cooking.
Cons: Can be difficult to start a fire in these stoves as the stove’s opening is small. If you blow into the stove a wave of heat can come back at you and burn your face. Apparently it also takes more work to construct than the simple rocket stove, as well.
Here is the Lorena stove being lit:
I’m conflicted about this design because of this — it seems materials matter.