I have had those garage heaters before, also burnt waste oil.

This is a bit more sophisticated, Refleks burner in a Morso stove, sealed flue, no smell at all.
I'm saving waste oil for a spinner to clean the oil and then find a way to de-acidise and blend with diesel. Not yet sure at all...
 
I'm saving waste oil for a spinner to clean the oil and then find a way to de-acidise and blend with diesel. Not yet sure at all...
I have found filtered waste oil mixed in diesel works fine in old engines with inline injection pumps. May even be better than modern diesel, which is very thin, and has veg oil in it.

I would be pretty wary about trying it in modern diesels, though.
 

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