popular smart bio ethanol burner. High quality, low pollution, high safety, low energy consumption, convienient operation popular smart bio ethanol burner.Material: stainless steel, cold-roll ... low energy consumption:Annual fuel combustion of our smart bio ethanol fireplace: 0.35L/h. If combust 6 ... is $1.3/L. (when the cellulose ethanol is completely commerialized, the production cost would be ...