Shaun,
If your thinking about using this for the purposes of cleaning hard floors, i.e Tile & Grout etc, then I can highly recommend this type of set up.
We currently run a team in the Channel Islands cleaning hundreds of hotels & commercial floors using hot water pressure washers with a SX15 cleaning & extractor head. It's a very efficient type of set up which offers truck mount results at a fraction of the cost.
If this is what your asking let me know and I'll find out what machines we use. I know we started off with one and now have three, we were that impressed with them. Not too expressive to be honest about £1,200 if I remember rightly.
Let me know and I'll find out more info if you need it?