I have bissell spot clean http://cleanthiscarpet.com/bissell-spotclean-professional-best-portable-carpet-cleaner
I like this one because it comes with the turbo nozzle, it's sturdier than the smaller nozzle, I never use the auto brush feature because it stinks, but it's bulkier and I get better performance out of this brush head. I put a pot of water on the stove and get it to a boil, then fill the tank up and use it with really hot water. I've found it works a lot better than the crappy heater on the unit.