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Heating oil produces 138,500 British thermal units per US gallon (38.6 MJ/l) and weighs 8.2 pounds per US gallon (0.95 kg/l). Number 2 fuel oil has a flash point of 52 Â°C (126 Â°F). Most heating oil products are chemically very similar to diesel fuel used as motor fuel.
Oil prices have risen so high that oil heat, once competitive with other major home-heating fuels, has become the most expensive to use. Prices are tied to world events, so they can change quickly. But the trend of the past decade is clear: Heating oil prices have more than doubled from $10.31 per million British thermal units to more than $25 per million Btus. Nationally, only about 6 percent of homeowners use oil as their primary home heating source. Most of them are located in the Northeast.