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Bio Residual Oil

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Lighter vegetable/animal bio fuel oils, distilled out in the refining process, create a fuel with similar viscosity to No. 6 oil.

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BRO flame and burner
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BRO flame and burner

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Made by Renewable Energy Group (REG) in Ames, IA, Bio Residual Oil (BRO) is the biodiesel equivalent of No. 6 oil in viscosity, composed of the heavy hydrocarbons left over when they refine biodiesel. REG is the largest supplier of biodiesel in the United States, producing it from agricultural waste, animal fats, and recycled cooking oil.

After all the lighter vegetable/animal bio fuel oils are distilled out in the refining process, the "bottoms" or "residual oils" are left over as a waste product. Because of it's viscosity similarities with old No. 6 oil, Preferred  has resurrected some of its traditional and time-tested rotary cup combustion and fuel handling technology to burn this residual oil at a very low 160° F. This produces very clean, high efficiency combustion.

Bio Residual Oil can be used in existing oil firing systems with simple burner and fuel handling system retrofits.

Preferred has developed the technology to burn a renewable waste fuel that has 85% lower carbon emissions than typical fossil fuels. This fuel has the potential to reduce carbon emissions in the United States by thousands of tons per year.

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  • Quick Facts
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  • Better BTU performance
  • Cleaner burning than coal or wood pellets
  • 100% Renewable
  • Eligible for Renewable Energy Certificates (RECs) and RINs
  • Ideal consumer: an entity that burns No. 4 or 6 oil at a locked-in price
  • To be even more green, burn BRO at lower temperatures
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