Uni Flame Fireplace. Don¹t let structural limitations get in the way of time spent gathered around the fireplace. The freestanding Uni Flame (2008) evokes the mood of a fireplace without knocking out a wall. Not requiring a flue, the uniform flame is created from clean-burning ethanol. Holding 2.5 liters of fuel, this unique fireplace creates a cozy ambiance without creating much heat making it useful all year, indoors or out.