Elstein HLF panel heaters are ceramic infrared heaters, which can be used for operating temperatures up to 700 °C and surface ratings up to 42 kW/ m². Because of their special frame size, HLF heaters are designated for the construction of heating panels, which are equipped with a thermal insulation, inside and outside of the heater. With this system of the two-stage-enhancement of the efficiency of the whole panel, the thermal insulated internal space of the back side of every single heater, generates a relevant heat resistance. The solid insulation inside the insulation area at the back side of the heating panel, effects the rest of enhancement of the intended efficiency, increasing up to 78%. Elstein HLF panel heaters cover the power range from 250 W to 650 W.