This page mentions some substitutes, for vehicles.
From what I could find, jet A flash point about 38C, where fuel oil is about
60. It's possible that the fuel would work fine, but I would not want to
risk it. It may very well burn too hot, or too cold for the usage. Diluted a
bit (1 to 10) your furnace might not notice the difference.
The web page above said jet a would work well in Dodge diesel engines.
Christopher A. Young
Learn more about Jesus
Click to see the full signature.