Alva 3 Panel Infrared Gas Heater (Large) - 3 Ceramic panels with variable heat settings, Oxygen depletion sensor with flame failure protection device , Heats up rooms with size up to 50sq/m , Heat Output 1.55kW – 4.2kW , Integrated Piezo ignition incorporated into gas control knob , Positive OFF at gas flow control valve , Fits all industrial cylinder valves , Uses 9kg Gas Cylinder- Not included ..