Powerblanket PBL20 Lite Gas Cylinder Heater 90°F Fixed NewPowerblanket Lite gas cylinder heaters are a revolutionary new heating product. These amazing new heaters are designed to optimize the container pressure for gas cylinders, like propane. If temperatures get too cold, propane tanks will lose pressure and become unusable. Additionally, cold gas cylinders need to be refilled more often. If heated properly, propane and other gases will maintain pressure and work properly in extreme conditions.