• Gel fuel fireplaces are ventless, and considered safer than conventional wood-burning fireplaces. The fuel is made up of gelled alcohol, and temperatures within these portable fireplaces rarely go above 170 degrees Fahrenheit. Gel fuel also burns clean, with virtually no environmental impact, making it a safe alternative for gas log and wood-burning fireplaces. As with any type of home appliance, safety is an important factor in the use of your gel fuel fireplace.
  
  

Be Careful of Moisture

• Some people may confuse a ventless gel fuel fireplace with a ventless gas fireplace. The ventless gas fireplace tends to produce excessive moisture in the air, which can lead to mold problems if not monitored. Ventless gel fuel fireplaces, on the other hand, produce minimal moisture, and in dry conditions, it may evaporate before it ever becomes a problem. However, it is still wise to monitor excessive moisture and keep your rooms properly ventilated.
  
  

Don't Expect Much Heat

• While a gel fuel produces the same snaps and crackles as an authentic wood-burning fireplace, the heat it emits is low in comparison. Gel fuel fireplaces are mainly for display and ambience, and should not be considered for significant warmth. While it does produce a mild warmth, it is mild enough that you can display trinkets and photos on its top without consequence.
  
  

Use Appropriate Gel Fuel

• Gel fuel is made up of gelled alcohol and burns like a citronella candle. Because the cost of the fuel can be prohibitive, you may be tempted to make your own fuel. This is inadvisable because isoprophyl alcohol and regular wax burn black and cause interior pollution that professionally-made gel fuel doesn't. Some gel brands may cause headaches as they burn down, while others don't. As with any candle or fire, don't leave your gel fuel fireplace unattended.