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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Dear Alex<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Cecil certainly does because lifespan is core to his arguments about improving the experience of the owner. If a Keren stove lasts about 3 months in Yogyakarta, 2 weeks in commercial use, then a stove that lasts 3 years can justifiably be quite a bit more expensive.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Whether burning the char lowers the lifetime or not is dependent on the materials and the temperatures. I think there is an assumption in the tincanium stove producers that burning char is bad because their stoves can’t handle it. Other people make stoves that only burn charcoal so if they are adapted to burn wood as well – no problem. The technology is not limited to what people happened to use to build one.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Here is an Anglo Supra Nova (nominally a charcoal stove) burning 6mm wood pellets TLUD style.<o:p></o:p></span></p><p class=MsoNormal><img width=165 height=244 id="Picture_x0020_1" src="cid:image001.png@01CE351C.4D6E3E30"><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Here you can see individual preheated secondary air jets entering the wood gas.<o:p></o:p></span></p><p class=MsoNormal><img width=456 height=322 id="Picture_x0020_2" src="cid:image002.png@01CE351C.4D6E3E30"><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Here you can see the charred pellets being burned after pyrolysis is complete. This is accomplished by opening the primary air door which changes the air/fuel ratio on the primary side.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>This unit is slightly cheaper than the Anglo Supra (a sort of Thai Bucket which was itself introduced 30 years ago by Robert van der Plas and ‘Tig’ Tuntivate, so it is rumoured). It has a working life of about 3 years burning charcoal. Cost is $5.50 retail, much less at the producer.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Crispin,<br>Do you think it is useful to place a value on the reduced life span of a $5 TLUD when burning char compared to the same TLUD not burning the char?<br>Alex<br><br><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>