One highly rated steam-powered vacuum is the Bissell Vac & Steam, according to Trusted Reviews. Some other highly-rated steam powered vacuums are the Hoover SteamVac Max Extract and the Rug Doctor, according to TopTenReviews.
The Bissell Vac & Steam features both a steam mop and a bagless vacuum in the same unit. It can hold 380 ml of water and comes with fragrance discs to help freshen rooms.
The Hoover SteamVac Max Extract receives a high rating because of its maneuverability and range of accessories, including a 9-foot hose and upholstery tool.
The Rug Doctor is a heavy-duty steam-powered vacuum that does an effective job of recapturing all of the moisture the steam portion of the system releases onto the carpet.