Good news on the new orders, BUT! Using waste engine oil to fuel these is BAD idea IMHO! Good luck getting local EPA air permits for them! Maybe times are changing, but last time I asked about this in Texas I was told not to even try it. http://www.epa.state.oh.us/portals/32/pdf/Used_Oil_Burner_Guidance.pdf http://www.michigan.gov/documents/deq/deq-ess-p2tas-burningusedoil_190423_7.pdf http://www.google.com/search?q=epa+motor+oil+burning+permit&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a Mostly I would be concerned about the heavy metals in the used motor oil being exhausted. At least that was the always the big hang up in the past.