The grate height in modern household gas stoves is typically designed with several considerations in mind. While it might seem like it wastes heat and causes inefficient heating, there are valid reasons for this design:
Safety: Placing the burner lower to the ground increases the risk of accidental contact with the flame, especially in households with children or pets. The raised grate provides a barrier and reduces the likelihood of burns or fires.
Air circulation: Having a gap between the burner and the pot allows for better air circulation around the flame, which aids in combustion. Adequate oxygen supply is essential for efficient burning of the gas, and this design helps to maintain a consistent flame.
Even heating: By positioning the grate higher, heat is distributed more evenly across the bottom of the cookware. If the burner were too close, there would be concentrated hotspots, leading to uneven cooking and potentially scorching food.
Versatility: The raised grate allows for the use of different sizes and types of cookware. You can use larger pots and pans without worrying about them being too close to the flame, which offers more flexibility in cooking.
Easy cleaning: The gap between the burner and the cookware makes it easier to clean up spills and debris, as they are less likely to get directly on the burner.
Energy efficiency: Contrary to the initial perception that it wastes heat, the raised grate design can enhance energy efficiency. With better air circulation and even heating, the stove may perform more optimally, leading to less overall energy consumption.
While it's true that some heat may be lost due to the distance between the burner and the cookware, these safety, efficiency, and usability considerations outweigh the small decrease in heat transfer efficiency. Manufacturers aim to strike a balance between safety, cooking performance, and energy efficiency when designing household gas stoves.