DESC: Blue flame vent-free gas space heaters operate like your central heating system, gradually warming the air in the room. Low installation cost as this vent free unit requires no chimney or venting. Ideal for any 300 square foot room in the house - including bedrooms. Place it in a smaller room and the safety mechanisms will continually shut this unit down. Place it in a larger room and the more distant parts of the room will remain unheated.