Does an oil furnace burn carbon monoxide or carbon dioxide?

Neither, but it PRODUCES carbon monoxide. Any fuel burning system has the potential to produce different levels of carbon monoxide. It is a good idea to have a qualified technician inspect the oil furnace since they need more attention than any other fuel burning appliance. It is also a great idea to purchase a carbon monoxide detector and install one within 15' from any bedroom or if you have a multi level home purchase one for every level. Illinois has a new law that requires one in every home even if it is all electric but with an attached garage. I hope I answered your question.Does an oil furnace burn carbon monoxide or carbon dioxide?
They have both. Carbon monoxide will kill you. YOU NEED TO GET YOUR BOILER CLEANED or you might not wake up tomorrow.Does an oil furnace burn carbon monoxide or carbon dioxide?
It burns oil and oxygen from the air. It produces both carbon monoxide and carbon dioxide which are present in the exhaust. Carbon monoxide can be lethal and carbon dioxide is a pollutant considered a greenhouse gas which many believe is a main contributor to global warming.
an oil furnace burns oil...but produces carbon monoxide.
Neither, it burns oil.
It burns Oxygen (and oil), it produces Carbon somethingoxide - mono I think
Carbon monoxide is produced when the fuel doesn't have enough oxygen, it will also produce soot, a properly maintained furnace by a qualified person will reduce the risk of the happening.
Several answers are close, but none are 100%. Oil, gas, gasoline, coal, wood, pellets, etc. all burn oxygen and produce carbon monoxide and carbon dioxide as by products. They also produce water and other substances as byproducts.





Most of them get their oxygen from inside the building they are in. This reduces the oxygen in the building and can replaces SOME of it with the carbon monoxide and carbon dioxide. High efficiency gas furnaces have a vent from the outside to draw in outside air to burn, for this very reason.





A device that is not adjusted right can produce more carbon monoxide than one that is adjusted properly. That is why it is important to have it inspected periodically and to have a carbon monoxide detector.





Even worse is one that is broken, for example a rusted out heat exchanger. That allows much, much more of the burned gasses into the room(s).





Also, some heaters, by their design, use a lot of oxygen in the room and expell a lot of the bad gasses back into the room. An example is the portable heaters sometimes used in construction. Also the once popular kerosene auxillery heaters.





They have fallen out of grace mostly because of this fact.





P.S. RJS had a very good answer, but it was not there when I wrote mine.
An oil furnace burns oil.