Simmer burners are small gas stove burners with a lower heat output than regular gas stove burners. They also give you more fine control over lower temperatures than standard burners. Simmer burners heat to 6,500 BTU (British thermal units) or less while standard burners can usually produce between 7,500 and 9,500 BTU. Not every dish can be cooked quickly over high heat; many foods require slow cooking over a low flame for long periods of time. A simmer burners on your gas cooktop makes it easier to cook these foods by minimizing the risk of burning and scorching.