Alan,
Yes my machine does cause polution, that i am never goig to deny. But before you worry about miniscule amounts from this, you should worry about the polution from the thousands of aeroplanes, especially jumbos, that probably will burn mor fuel in 1 month than my machine will burn in it's life span.
Yes fuel cells are an up and coming phenominem, but i think to get the technology right is a long time a coming.
Hosepipe bans; we've had these before and they usually last a short time only. These so called recycling machines are a new fad. Do you not walk into your local retailers and diy shops, and see a range of products on the little telly screen in the store or on your own telly advertising a range of products with new concepts. People are intrigued by them with the large proportion of them buying it, only to use it a few times then putting it away in the cupboard.
In short these people know that, and with good advertising, hopefully they can make the sale before the concept falls flat on its face.
This echos the age old story of the emperors new clothes. The king is naked said the little boy!
On a serious note, i used a portable for 3 happy years, with the view of upgrading to a truck mount. The suction is better, the instant heat is better, the reliability is better long with its image. Yes image, you might say, here we go again, carpet cleaner with big ego. No Alan i am simply using a tool just like you are to do a job, but i along with all the other carpet cleaners will tell you time and time again that our product does it better than any portable. If your theory held any water, truck mount sales would be i decline instead of the other way.
In short, £20000+ might seem a lot of expenditure migh seem a lot of money, but with my individual case there are good tax circumstances, and as the old advert used to say, because i can.
Dave