The flame of the gas cooktops is pre-adjusted before shipping to the customer. If the flame you use is too big, please make sure you use the right gas source, the gas cooktop is pre-installed for natural gas use, converting to propane use need to replace the NG nozzles with LPG nozzles (LPG nozzles are attached within the package), and a 0.4 PSI gas regulator is necessary. Any problem please feel free to contact us.