This paper aims to identify performance improvements in cooker-top gas burners for slightly changes its original geometry (aspect ratio). The residential use device operates on LPG - Liquefied Petroleum Gas, with eight different geometries (diameter, height, etc.) and five thermal power levels or firing rates (TP1 up to TP5). Considering the large number of cooker-top burners currently being used, even a slight improvement in thermal performance resulting from a better design and recommended operating condition will lead to a significant reduction of energy consumption and costs. Appropriate instrumentation was used to carry out the measurements and methodology applied was based on regulations from INMETRO (CONPET program for energy conversion efficiency in cook top and kilns), ABNT (Brazilian Technical Standards Normative) and ANP - National Agency of Petroleum, Natural Gas and Biofuels. These results allow subsidizing recommendations to minimum energy performance standards (MEPS) for residential use, providing also higher energy conversion efficiency and/or lower fuel consumption. Main conclusions are as follows: i) Smaller aspect ratios result in the same heating capacity and higher efficiency; ii) Higher aspect ratios (original burners) are fuel consuming and inefficient; iii) Operating conditions set on intermediate are lower fuel consumption without significant differences in temperature increases; iv) Reynolds number lower than 500 provides higher efficiencies.