DeLonghi TRV0715T Vento Safeheat 1500W High-Speed Convection Oil-Filled Radiator with Timer Permanently sealed pure diathermic oil never needs refilling High-speed convection design provides hotter air than a typical oil-filled radiator Venturi effect allows heated air to rise faster and gain high speed when leaving the narrowed top of the enclosed fins Room monitoring thermostat automatically maintains your desired room temperature 24-hour timer heats on your schedule