PBL500: The PBL500 is an insulated gas cylinder heater specifically designed to fit a 500 Gal. horizontal gas cylinder tank. The heater is built for use with 120-Volt AC, drawing 6 amps thus producing 720-Watt. It has a preset thermostat set for 100 ºF/38 ºC (± 10 ºF/5 ºC). Propane tanks supply the best output when warm, whether it is the ambient temperature that is keeping your tank warm or an external heat source. Gas volume is determined by the number of molecule collisions occurring within the container, and these collisions increase as the temperature increases. POWERBLANKET Lite gas cylinder warmers afford you increased propane flow in mild weather conditions. In extreme cold, the POWERBLANKET energy will go towards heating the exterior of the tank in order to prevent as much heat loss as possible. What will this product do for me, In mild weather, 720-Watt will allow an additional 13 lbs./hour of propane to flow. What about the insulation, In extreme cold, the heater energy will go towards heating the tank. To maximize the heater's benefit in cold weather, additional insulation must be added to the tank to prevent heat loss. What size gas tank will it fit, Designed to fit on the belly of a horizontal 500 Gal. propane tank. Requires a minimum of 40 in. spacing between tank legs and requires 52 in. arc on the bottom of the tank to be smooth walled and free of protrusions. Color: Black. Material: Vinyl.