SUPERIOR, WI (KDAL) - A heat gun being used to thaw frozen water pipes is the suspected cause of a fire that destroyed a mobile home in Superior on Monday.  The two residents of the home were able to get out safely.  Fire crews were called to 3132 East 5th Street, Lot 19 at about 3:20 p-m and spent nearly three hours on the scene.  The mobile home was a total loss.