H,
Take a look at the link"

http://www.ozonegeneratormachines.com/water-ozone-generator-ozonator/water-oz...


what do you think of this unit for ozonating water and external use. They are based in Las Vegas..

Based on what I am reading I have my doubts that the unit is a cold corona.  Even more when I look at the parts.  First of all you cannot generate ozone with a 1KV transformer unless it is a solid state transformer.  But solid state transformers operate at a much higher frequency converting cold corona tubes in to a hot corona.  Looking at the parts in side I am pretty certain they are using a solid state transformer.  This would also explain the heat they are talking about reducing with the fan and there talking about having to replace the tubes.  A properly constructed cold corona tube will produce very little heat and the tubes generally last decades.