I will guess between 12 and 17%.
There is the excess air, and the wood and fire look to large to heat such a 
small pot, the pot can't catch that much heat,  It is going to take a lot of 
fuel to create a fire large enough to burn wood that size. I dont see flames 
lapping the pot so he must be burning over a bed of hot coals, and there is no 
pot shell.
Lanny
  ----- Original Message ----- 
  From: Crispin Pemberton-Pigott 
  To: Stoves 
  Sent: Wednesday, October 24, 2012 11:31 PM
  Subject: [Stoves] Stoves of Indonesia


  Dear Friends

   

  How efficient is this? Anyone want to guess?

   



   

  Regards

  Crispin

   



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