I know that people in rural areas can't get gas to power their gas stoves and furnaces (to warm their houses) from the utility companies. The gas must be put in portable containers and transfered to the houses. I often see propane gas tanks for sale at grocery stores and Wal-Marts, etc. What is natural gas? What type of gas do people generally use to power gas stoves? What gas do people usually use to heat their houses? When people use an appliance that uses gas to heat their houses, is that appliance called a heater or a furnace?