Ethanol fireplace fuel is the fuel that you will burn in your fireplace. The two forms of fuel you can buy are liquid fireplace fuel and gel fireplace fuel. Please check carefully which fuel goes with which unit as these two forms of fuel are not interchangeable. We only carry one option for gel fuel, SunJel, which in our experience burns the most efficiently and omits the least fumes. For liquid bio ethanol fireplace fuel we suggest you use the smart fuel with Anywhere Fireplace models and the Ignis fuel with Ignis models.