The Maine Full Depth High Efficiency Coal Gas Fire with Brushed Steel Fret and Brushed Steel Trim boast a 3.9 kW output and 74% efficiency. The manual control allows for adjustment of the heat output and flame effect. The real flames give a radiant heat output, the fuel bed is a permanent and realistic ceramic coal bed. Installation requires a chimney or flue with an opening of(D)240mm (H) 545mm (W) 365mm. The product comes with a 10 year warranty.