Fossil fuel appliances are devices that use fossil fuels, such as natural gas, propane, or oil, to generate heat or energy. Common examples include gas stoves, furnaces, and water heaters. These appliances are widely used in homes and businesses for cooking, heating, and hot water. While fossil fuel appliances are efficient and effective, they can contribute to greenhouse gas emissions and air pollution. As a result, there is a growing interest in alternative energy sources, such as electric appliances and renewable energy, to reduce environmental impact and promote sustainability.