The smallest model from the O-collection, the stylish 04 incorperating the state-of-the art Fire-Slide control, offers big stove performance but with small stove output. Designed to heat areas typically of around 46 cubic metres, the O4 also incorporates a preheated Airwash System, allowing you to enjoy the comfort and beauty of dancing flames without you being overheated. 81% Efficient.