ThermaFuel – 1 Gallon Jug - Diethylene Glycol Long Shelf Life FuelThermaFuel is a non toxic, smokeless and clean burning fuel made of Diethylene Glycol. You can use indoors or outdoors with no worry of carbon monoxide. ThermaFuel is shelf stable for over 20 years, making it the perfect fuel for cooking, heat and light in an emergency and also for hiking and camping. These bulk 1 gallon jugs of ThermaFuel are perfect for refilling the Refillable ThermaFuel Stove. Package Information About 88 Hours of Burn Time Safe