I hope ducttape is kidding! In 1984, while completing a Mech Eng degree at U Maine, we had a professor who was hired to test a similar device that was designed for oil furnaces. Myself and another student were paid a couple of bucks to help test the efficiency of this device at a local vocational technical school. We setup and ran an effiency test on a small boiler, once without this device and once with. The idea was to heat the incoming oil which would reduce the viscosity and hopefully cause the oil to form a vortex as it was injected into the combustion chamber. The result was supposed to be a) better atomization of the fuel resulting in better combustion and b) a reduction in the oil flow rate caused by restriction due to the supposed vortex that formed. In a nutshell, if I recall correctly, the efficiency of the boiler was unchanged by the vortex, and if you considered the heat required to thin the oil, the system efficiency actually dropped. I'm sceptical!