Waste Oil Heater Forum - Your definitive source for burning waste oil for heat.

OK.  I found one for $75.  I think he said it worked for a while, but it got so he had to keep resetting something to get it to fire and he gave up.  I'll re-read your post about your boiler project, and as time goes on, probably be asking more questions.  Thanks for your reply!

I’m looking to buy a used Thermaflow fuel oil furnace with a round burn chamber that is 17" in diameter.  Is this suitable for a waste oil conversion?  I heard that the burn chamber should be at least 12".  Is that 12" in front of where the flame starts?  How far does the burner stick into the burn chamber?  Thanks.

If it is in decent shape I think that is a great price.  As you will notice with my boiler, I have a short burn chamber.  I was able to overcome this somewhat by extending the tube that connects the burner to the furnace.  You may be able to do this too if you have to.  I think forced air furnaces typically have a larger burn chamber so you might be fine.  Hard to say how easy it is to remove the burner, but if you can you could certainly measure.  I would think you should be able to make it work.

Sounds like you are on the right track for sure.

Not a forced air project, but otherwise going to be pretty similar to what you are looking at doing, check out my build here:
http://wasteoilheaterforum.com/index.php?topic=208

No, not all require air, but siphon is superior to a pressure system.  My first system used pressure using the same oil pump that the burner came with.  Pressure works great with clean fuel oil, but not so well for waste oil.  I believe most commercial waste oil burners will have a siphon system.  I'd definitely look into the CK conversion kit.  Makes the burner into a siphon system with ease.