#1 Fuel Oil
Also referred to as #1 Heating Oil, Kerosene, or JET-A, #1 Fuel Oil is the highest refined of the three heating oils available. #1 Fuel Oil does not begin to gel until temperatures reach -60 degrees Fahrenheit. Toyo and Monitor heating stoves require nothing less than #1 Fuel Oil and are also necessary if your fuel tank is above ground regardless of your type of heating system.
#2 +10 Fuel Oil
Also referred to as #2 Heating Oil or Summer Fuel, this blend of fuel begins to gel at 10 degrees Fahrenheit and has the highest BTU (British Thermal Unit) of the three, but is not suitable for use in the winter. If fuel usage is high in the summer, this fuel type can be the most cost-effective alternative. However, as the season changes and the temperature drops, this fuel type will not flow properly.
#2 -15 Fuel Oil
Referred to as the standard #2 Heating Oil for the Fairbanks area, this is a 50/50 blend of #1 Fuel Oil and #2+10 Fuel Oil. This provides the sought-after BTU to run a boiler and does not gel until -15 degrees Fahrenheit. This is the only #2 Heating Oil available in the winter.
Regardless of the delivery company you have chosen, customers will notice a message on their delivery ticket, which states the volume is corrected to 60 degrees Fahrenheit. Fuel expands and contracts with changes in temperature. Thus, a straight volume measurement is inherently inaccurate. For instance, a 500 gallon gross delivery at a fuel temperature of 50 degrees Fahrenheit will measure a smaller volume when cooled to -20 degrees Fahrenheit. Have you ever filled your car with fuel in February and then immediately park in a heated garage?
The industry-standard base temperature is 60 degrees Fahrenheit. The rate of expansion and contraction of each type of fuel due to temperature is factored into the measurement. A compensated gallon delivered at 50 degrees and a compensated gallon delivered at -20 degrees will both have the same volume when warmed to 60 degrees. Change in volume due to change in temperature is effectively eliminated, which creates a more accurate gallon.