Hot dog, many thanks for the links and info.
Too late in the am to look now, but, will in the morning when I can get back.
One time while on the lake after a heavy rain up river I just happened to be dragging my alum boat behind the cruiser when I saw somethign big floating. Turned out to be a dozers fuel tank. I wrestled it into the rowboat alone out in the lake. Wasn't very easy either. They're big and heavy andthis things had 1/4 tank of water in it too. Anyway, I've had it in the shop maybe ten yrs now awaiting the day I could install the boiler and floor. That tanks been planned for storage of used oil's of all kinds, what ever happens to come along.
I'll make a deep feed tube with fine screen strainer to fill the oil into the tank thru. IF need be, I can thin it with something else. Was going to say diesel, but, todays price's blow that away. Might be cheaper to heat it all with natuaral gas.
The many used oil heaters I've seen have been out in the country where smoke dont' matter. One guy's shop was a diesel truck repair shop so he had many drums of used oil every year. Imagine I could go out there and get a few yet even though he died five yrs ago.
Problem with his, he'd fire that sucker up with just a drip tube and the smoke would roll out the stack. Since I'm in town and middle house on the block I'm limited to as little smoke as possible. That's why I wanted to atomize the oil. I could even pipe in compressed air if that would help.
Beyond bedtime, I'll be back on this. Thank you.