Flavel Calypso Plus High Efficiency Gas Fire (Open-Fronted) The new, Flavel Calypso Plus is a open-fronted, high-efficiency gas fire which features a highly realistic coal fuel effect and comes with a convenient slide control Incredible 4.2kW direct heat output The Flavel Calypso Plus high efficiency gas fire boast an impressive 68.3 energy efficiency and can be installed in to almost any chimney or flue, include Pre-cast when fitted with a 3” rebated fire surround Flame Supervision Device & Airwatch System Radiant & convected heat Models suitable for connection to natural gas or LPG Slide control for easy operation Realistic coal fuel effect Air vent not needed