Hi Bungie, The vapour generator in the tug above is a JJC unit which are unfortunately no longer manufactured. Mark, now makes a similar unit, as linked to above, which should give the same effect and also has the major advantages over the heated oil types of using less power and not having a hot element heating up oil inside your precious boat!
The disadvantages are that the units are bigger and Marks does need an additional power supply for it but if you have the room, and in an Imara with a motor propulsion you have the room, then you can get some very realistic effects. I recieved a unit from Mark only today, thanks Mark, and I will be having a play around with it on the bench tommorrow.