An Oil Burner heats the fragrance oils until they evaporate into the air. Thicker oils, like my handmade burning oils, can be well-dispersed into a room when using a Oil Burner. Oil Burners come in many types, including electric oil burners, candle oil burners and lamp rings. All models of heat burners use a tray where the oil is held next to the heat source so that it will heat and evaporate.