Emclosed flame heater represents a revolution in mobile forced air gas space heating. Electronicaly controlled burner technology with fully enclosed flame and unique heat exchanger coils produces 200,000 BTU's of heated air with extremely low emission exhaust. 100% eefficiency is achieved by adding the exhaust gases into the heat output but at a flick of a switch all products of conbustion can be ducted away. Features:- Patented cleanburn technology, Powerfull forced air fan, Dual voltage (100/230V), Output ducting to 10m, Exhaust ducting to 10m, Weatherproof. Economical 47kg bottle last up to 12 hours on full fire! For large drafty areas, warehouses, workshops, construction sites, exhibition halls, building drying, marquees, tempory buildings, events, agriculture.