The Grace Slimline Coal Gas Fire with Chrome Fret and Brushed Steel Trim boast a 2.9kW output and 49% 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)120mm (H) 550mm (W) 320mm. The product comes with a 10 year warranty.