First and foremost, a gel ventless fireplace is the safest type among all ventless fireplaces. Aside from this, it is also safer than the traditional fireplace types which make use of natural gas or wood, and require a chimney to function. The one powered by natural gas or propane causes a deposit buildup over time. When this happens, the gas jets become obstructed. This then, results in a fire that is not burning properly. In addition, a propane leakage is very possible because the fittings used for the gas line could loosen easily. Propane or natural gas is extremely hazardous.