RedactedNarrative: The District of Columbia Fire Department was alerted to a vessel fire at James Creek Marina on the Anacostia River, Washington DC.   Upon the fire department's arrival on the scene, two vessels on "B" dock (Vessels #1 and #2) were completely engulfed in flames and subsequently burned to the waterline.  Vessels #3 and #4 were on each side of the engulfed vessels and subsequently suffered severe burn damage.  All four vessels were deemed complete losses by the vessels insurance carriers.  The initial investigation revealed that a space heater ignited materials in vessel number 1's bilge and caused the fire and resulting damage.