These smokeless fireplaces burn gel fuel, which is derived from isopropyl alcohol. It creates no smoke and emits no toxins. It is odor-free and completely safe and environmentally-friendly. The selection of gel fireplaces we have here at Pro home Stores is not only extensive; it is quite diverse. Plus, the quality gel we sell here for these ventless fireplaces actually pop and crackles just like real wood. Whether you are looking for one to fit right into a rustic environment or if you need one to become a focal point in an exquisitely decorated contemporary room we have one here to complement your space beautifully.