How does ducted gas heating work? Ducted gas heating is one of the cleanest and most energy efficient forms of home heating – and the Braemar Ecostar is Australia’s most efficient range of ducted gas heaters. Depending on site conditions the whole heating system can be neatly concealed under floor or in a roof space. The system works by drawing air from inside the home. A fan then blows this air over heated tubes before re-circulating the air into the home. Cleverly designed gas jets shape the flame to ensure that the maximum heat is obtained from the gas. The exhaust is drawn through the system and flued out through the roof through outlets in the floor or ceiling to ensure safe, clean and efficient heating for your home.