Lifestyle 3.5kW Propane Gas Site/Space Heater (LFS903) A workshop or construction site heater has to be used safely, and it has to be used in the right space. The Lifestyle LFS903 is a portable radiant propane space heater with a single 3.5kW heat setting, piezo ignition, an oxygen depletion safety system (ODS) and a flame failure device (FFD). A hose and 37mbar propane screw-in regulator are supplied. The ODS cuts off the gas supply by extinguishing the pilot flame if it senses a shortage of oxygen, and the FFD cuts off the gas if the pilot flame goes out. These are additional safety features and are not a substitute for ventilation. The heater releases combustion gases into the room, and it uses oxygen from it. Lifestyle states it is not for domestic use. It must be used only in a well-ventilated room of at least 70m³ (for example about 7m