Gas combo steamers/kettles combine a kettle and a steam function. They allow you to heat water on the stovetop or in the microwave and then switch to the steam function to heat your food with the steam. These electric kettles come with a wide range of capacities and temperatures, from 104 degrees Fahrenheit to 21 degrees. Gas combo steamers differ from conventional electric kettles in that they are designed with a heating element that sits directly underneath the water level. The heat generated by this element then heats the water directly and not the entire appliance. This means that the water inside the kettle will reach the desired temperature faster. The most widely used materials in manufacturing gas combo convection steamers/kettles are stainless steel and aluminum. While stainless steel is a little bit more expensive than aluminum, it is widely preferred due to its durability and ease of cleaning. Apart from these two materials, there are gas combo convection steamers/kettles that are made of non-stick ceramic or cast iron.