#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 -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.