I think Simon's right. The machines, and those of most other manufacturers, are not designed to work in a wet environment, which is why they would have the option of declining a warranty claim.
However, having two E40's and using them for about 6 or 7 years, they seem to be built like brick $*%+ houses and on the rare occasion that I've needed support from Envirodri they've been brilliant.
My advice to anyone contemplating an E30 or E40 is to go for it.
Colin
The Envirodri and similar machines such as the Prochem TM4, Flexi-5 etc. are in a totally different league to your Sebo Duo. Further, I can't understand how you're getting better results with a carpet brush than with an Oreck Orbiter. Did you plug it in?
Joe
Once you've experienced superior agitation, you'll make sure that you will find space on your van for it, even if it means a roof rack
Safe and happy cleaning
The Ken