This research is focused on the design and experimental evaluation of a high-power industrial burner supplied by natural gas at an operating pressure of 23 mbar, based on improving thermal efficiency with a variation in geometric parameters. The specific objectives of the work were the following: Define the calculation procedure to establish the geometric characteristics of the burner, determine the thermal efficiency define a test procedure for the tests of thermal efficiency and finally analyse the data obtained from the power, thermal efficiency, and fuel consumption of the designed burners. This investigation will be preliminarily presented for a three-part burner.