Opera radiant convectors offer a stunning blend of aesthetics, technology, and energy efficiency. To significantly save on energy, choose from one of the preset programs, customize your own, or let the absence detector take care of lowering the temperature for you! The open-window detection feature also avoids wasting energy by stopping the heater when a sudden influx of cold air is detected. Convex casing with rounded corners Perforated front panel for better radiant heat diffusion with absence detector High-limit temperature control with automatic reset Ribbed monoblock element made of high-emissivity aluminum alloy Programmable built-in electronic proportional-action digital thermostat, ultra-precise to 1/10 deg C (1/5 deg F), located at the top of the unit