High efficiency up to 80.2% (77.6% for multi-fuel) Energy Efficiency Class A Multi-fuel (with external riddling) Woodburner Approved for Smoke Control Areas* Cleanburn Airwash Flat top Nominal heat output and range 5kW ( 2.5-7kW) Maximum log length 7 7/8 ” (200mm) Room vent not normally required Boiler option Flue outlet 5” top or rear Ecodesign Ready