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This standard applies to three types of middle distillate fuel oils that are suitable for use in liquid-fuel-burning equipment without preheating (Types 0, 1 and 2), and three types of fuel oils that contain residual fuel components and require preheating (Types 4, 5 and 6).

The heating fuel oils covered by this standard are intended for use in oil burning equipment to generate heat for domestic and industrial purposes.

Types 0, 1 and 2 fuel oils are primarily for use in domestic oil burning appliances. They may also be used for some industrial purposes.

a. Type 0 fuel oil is intended for use in fuel domestic oil burning appliances that have outside storage and where ambient temperatures as low as -48°C could be encountered.

b. Type 1 fuel oil is intended primarily for use in sleeve-type and wick-feed burners, and in most vaporizing pot-type burner applications. It is also intended for atomizing burners in which Type 2 fuel oil cannot be used satisfactorily. During periods of lower ambient temperature, Type 1 fuel oil may be used in place of Type 2 to minimize waxing problems.

c. Type 2 fuel oil is a heavier distillate than Type 1 and is intended for use in most atomizing-type burner applications. This type of fuel oil is used in most domestic oil burning appliances and in some medium capacity commercial and industrial burners. Type 2 may contain up to 5% biodiesel.

Types 4, 5 and 6 fuel oils are primarily for use as industrial fuels: suitable for use in the pulp and paper industry, metallurgical operations, heat or power generation, etc.

a. Type 4 is an industrial fuel oil intended primarily for burner installations equipped with limited preheating facilities or with no preheating.

b. Type 5 is a residual fuel oil for burner installations equipped with limited preheating facilities that require a fuel oil of lower viscosity than Type 6.

c. Type 6 is a high-viscosity residual fuel oil for use in burners equipped with preheating facilities to handle such fuels.

The testing and evaluation of a product against this standard may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this standard has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any applicable regulatory requirements prior to its use.

Document History

  1. CAN/CGSB 3.2-2017


    Heating Fuel Oil

    • Most Recent
  2. CAN/CGSB 3.2-2015

    Heating Fuel Oil

    • Historical Version
  3. CAN/CGSB 3.2-2013

    Heating Fuel Oil

    • Historical Version
  4. CAN/CGSB 3.2-2011

    Heating Fuel Oil

    • Historical Version
  5. CAN/CGSB 3.2-2007

    Heating Fuel Oil

    • Historical Version
  6. CAN/CGSB 3.2-99

    Heating Fuel Oil

    • Historical Version