Reference: RTI15E - The Retro High Output gas fire 4.6Kw with a good efficiency of 67% inside a 1930`s style polished or traditional black cast iron insert, open fronted (no glass) . The art deco Tile panels shown are also included. The Efficiency of this OPEN fronted fire is a GOOD 67%. Manual Control. (Remote control and slide side control available on request). Also available in black finish or black, polished tile panels.