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[en] Highlights: • The new stove increases the thermal efficiency from 15.17% to 21.21%. • The new stove has a double-wall construction filling with rice husk ash. • The exhaust gas is prolonged to obtain a better heat transfer. • The new stove reduces greenhouse emission by 9.9 t CO_2/year. - Abstract: A new steaming stove is designed and constructed to use biomass as fuel. The new design aims to increase the overall thermal efficiency over a conventional stove. The thermal efficiency of the stove is determined and compared with a conventional stove in the standard water-boiling test using Eucalyptus wood as fuel. The stove has a double-wall construction filling with rice husk ash as an insulator. The results show that the thermal efficiency of the conventional stove is 15.17% while the new stove's efficiency is 21.21%. The fuel consumption decreases by 15.20% (25.8 g/kg-product) equating to a fuel cost saving of $190/year. The total cost of the stove is $268 resulting in a payback period of 1.2 years. In addition, the saving of fuel would be equivalent to greenhouse gas emissions mitigation of 9.9 t CO_2/year.