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Steve -

Yes, before you read the links, they are a little pricey.

Here you go! Propane blankets! If you are in a cold area, might be a good investment. You will be able to draw more gas out of the propane cylinder because of the warmth.

http://www.gilmorekramer.com/more_in..._warmers.shtml

http://www.iprocessmart.com/Merchant...egory_Code=GAS

http://www.powerblanket.com/propane-tank-heater/

Ron