What is number 2 heating oil?
NO.2 Heating Oil is sometimes abbreviated as (HHO) Also Known As Fuel Oil, Furnace oil, #2 fuel oil and many others. Heating oil is used to run heating systems The chemical makeup of NO.2 Heating Oil is made from petroleum and from that hydrocarbons are made. Hydrocarbons, to put it very simply, are a mixture of hydrogen and carbon. Heating oil can be very chemically similar to diesel fuel, so much so it can be used to serve each other’s purpose. So theoretically if you ran out of heating oil or think your tank is close to empty could you use diesel fuel instead? Yes & No, No. Yes because diesel fuel would work since the two fuels are so similar. And no, because your heating system was not made to run on diesel fuel and could ultimately damage your system. The second no, fuels are dyed for taxation purposes, heating oil a dark or light red, diesel fuel yellow and agriculture fuel can sometimes be green.
Sources: Wikipedia: Heating oil – https://en.wikipedia.org/wiki/Heating_oil