The Yellow Jacket 68848 fits 30 to 50-125 lb. cylinders. It is thermostat-controlled with a maximum surface temperature of 130°F (54°C) and a minimum of 120°F (48.8°C). It cycles on and off to maintain the surface temperature. It has a 200-watt, 115V power supply, 20" Velcro straps, and a 6 ft cord.