Abstract Improved Cooking Stove (ICS) is boon to the developing country like Nepal where more than 80% of the population residing on the rural areas depend on firewood as the main source of fuel to fulfil their daily energy needs. Various government agencies, NGO’s, INGO’s are working in the field of ICS since years back but, the achievement made is only satisfactory. This research paper focus on technical, economical and social consideration of improved cooking stove and address different process for user friendly fabrication of improved cooking stove with minimum utilization of raw material. Considering normal cooking practice for rural community of Nepal, stove has been design for sitting mode which includes one chimney, two pot holes, two feeding doors, two grate and modified top plate of mild steel. Addition feature include isolite insulating brick which helps to retain heat inside combustion chamber resulting increase in temperature, turbulence and time for higher thermal efficiency, lower specific fuel wood consumption, better fire power and burning rate. This paper describe three different design, whose performance was compared based on Water Boiling Test which follow the calculations based on Shell foundation Water Boiling Test Sheet Version 3, published by Aprovecho Research Centre. The average thermal efficiency based on water boiling test of Prototype #1, #2, #3 and #4 in cold start, hot start and simmering are 14-16-13 %, 18-19-9 %, 13- 26-18 % and 23-26-22 % respectively.