Four gasifier stoves, all developed at the Appropriate Technology Center (APPROTECH Center) of CPU, were evaluated in this study in terms of fuel consumption rate, percentage char produced, fire zone rate, thermal efficiency, and electric energy consumption rate. These include: Gasifier A or the cylindrical-type single-burner, top-lit updraft (T-LUD); Gasifier B or the cylindrical-type double-burner, T-LUD (for household use); Gasifier C or the conical-type double-burner T-LUD (for household use), and Gasifier D or the conical-type double-burner T-LUD (for industrial use). Evaluation was conducted at the APPROTECH Center on April 23 to May 29, 2007. Results of the study revealed that Gasifier A significantly (p
