Seems to be a ton of misconception and misinformation about burning used oil.
Yes, I often soak my wood in toxic waste. My neighbors really enjoy the thick black smoke that billows from my chimney...
I've burned used oil in the barrel stove out in the garage (by drip method and oil soaked wood) and I've never witnessed thick black smoke... ever.
A waste oil burner is designed to burn waste oil, cleanly and efficiently (it has to be) - A wood stove is not.
That's BS, all that is required for clean burning is enough heat. If your stove is hot enough to ignite the smoke and gasses used oil will burn just as clean as wood.
I can only imagine the smell, let alone the amount of crap that you'll get in your flue...and it seems to me that it would make more of a mess than its worth.
There ain't no smell, and the flue stays clean... used oil won't smolder like wood, it burns hot is near totally consumed as long as there's a flue damper or some sort of gas ignition chamber.
when you burn waste oil your useing atomatiztion and presure to mix air and oil to burn it cleaner
Say what? I know of, and have witnessed the use of at least a dozen waste-oil stoves and I've never seen any "atomization" or "pressure", they simply drip oil into the fire. There's only two types I've seen, and all but one were home-made.
One type drips the oil onto a burner plate affair that uses an internal exhaust hood like thing with a chamber where the smoke and gasses ignite. A friend of mine has one he built sitting in his auto repair shop, in town right across from the Court House... it runs all winter long and there ain't ever been "thick black smoke", a "smell" or a chimney fire.
The other type is simply a modified wood stove, a copper tube drips the waste oil onto the burning wood. Back before the new high-efficiency stoves the guys would weld baffles inside the stove to help keep the smoke and gasses ignited, all have a flue damper. The neat thing about these is they still work just fine with only wood. I had one built from a barrel stove, but rather than baffles it had a 55-gallon barrel for the fire box and a 30-gallon barrel on top of that used as the smoke and gas ignition chamber.
why? Is there something inefficient about just burning decent firewood in a decent stove?
Why? Because waste-oil has like a zillion more BTUs per pound.
I don't have a drip burner anymore... but if I want a lot of heat real fast out in the shop I just toss a couple of those waste oil soaked splits of wood in the fire box. Don't stand to close to the stove cause you're likely to melt your cloths and it'll peel the paint from your tool box.