As of October 2015, some of the top-rated Hoover carpet steamers are models F5914-900, F5915905 and F7412900. Each machine averages a rating of more than 4 out of 5 stars at retailers' websites. These steamers have double tanks that separate clean and dirty water.
The SteamVac F5914-900 has five rotating brush heads. Reviewers at QVC's site remark that the steamer has excellent suction, removes stains thoroughly and is simple to assemble. Hoover's SteamVac SpinScrub F5915905 has three speeds for different cleaning tasks. Positive comments at Walmart's website mention that it is lightweight and effective on stains and has a reasonable price.
Hoover's SteamVac Widepath F7412900 uses six brush heads. The highest reviews at Amazon.com say that the machine removes hard-to-clean stains and is easy to use.