The box I received was marked "natural gas/gasoline." It should have read "propane/gasoline." So, if you ordered the igen2550dfc and receive a box that states it's natural gas, it's not.
I received this yesterday and already fired it up. I cannot believe the power in such a compact design. The reduced sound is amazing. So happy I purchased the Westinghouse iGen.
Bought this during a round of terrible storms in our area and it served it purpose well. Very intuitive to use, easy to start up and small footprint makes storage a breeze.