The Logic HE features a glass front and boasts the highest efficiency of all the Logic Fires at up to 89%. With both conventional and balanced flue models, the HE is even suitable for homes without a chimney. The Logic HE box draws cool room air into the bottom of the convection chamber (2) the cool air is warmed as it passes over the hot surfaces of the chamber and the hot air is then emitted back into the room via the top convection slot (3). Maximum heat is radiated into the room via the virtually invisible glass front (4). The Logic HE balanced flue, Coal-effect and White Stone fires have been specifically designed with reduced depth to allow for easy installation into the internal skin of a traditional cavity wall.