Posted just for you...
A general classification for the heavier oils, known as No. 5 and No. 6 fuel oils, that remain after the distillate fuel oils and lighter hydrocarbons are distilled away in refinery operations. It conforms to ASTM Specifications D 396 and D 975and Federal Specification VV-F-815C. No. 5, a residual fuel oil of medium viscosity, is also known as Navy Special and is defined in Military Specification MIL-F-859E, including Amendment 2 (NATO Symbol F-770). It is used in steam-powered vessels in government service and inshore powerplants. No. 6 fuel oil includes Bunker C fuel oil and is used for the production of electric power, space heating, vessel bunkering, and various industrial purposes.
A sample of residual fuel oil
Who still uses fuel oil to heat their home? Seems it’s only in the Northeast. Funny how the “global warming” idiots in the NE use the most inefficient form of fossil fuel in their decades old heating systems.
Talk about hypocrites. Too cheap to buy a heat pump?
From a different perspective, after being without utilities due to the storm in the northeast, storage of fuel oil or propane seems more attractive than natural gas which may or may not be available.