Fireplace insert surround cast iron series la nordica inserto power type ambient air dependent heating power 11 kw efficiency 91 maximum room size 315 m flue connection rear flue connection diameter 80 mm electric ignition operating options remote control boiler control combustion chamber cast iron features fan integrated thermostat colour black height 576 cm width 702 cm depth 636 cm weight 161 kg pane for fireplace flat pane