A refinery fire in Venezuela and Tropical Storm Isaac gaining strength in the Gulf of Mexico are forces supporting heating oil prices this morning. The Commitments of Traders Futures and Options report as of August 21st showed non-commercial traders were net long 14,754 contracts, an increase of 3,159. Non-commercial and nonreportable traders combined held a net long position of 33,313 contracts, for an increase of 6,409 during the report week.