The term "High-Flow Extraction" in The Steamin Demon II High-Flow Extraction Cleaning System refers to both the high flow of water volume and air (vacuum) volume compared to other portable extraction carpet cleaning machines.

For 30 years cleaning equipment manufacturers sought to improve cleaning results by building ever-more-powerful equipment. Power for heat, pressure and vacuum. However, water flow, the most critical factor in carrying suspended soil from the carpet, has been kept to a minimum, at between 0.5 and 1.5 gallons per minute. This is because of concerns about over-wetting the carpet.

Field testing has demonstrated for a fact what common sense suggests: As more water is used to suspend and flush dirt and soils out of carpet, more soil is removed, the appearance is improved, and since fewer abrasive soils are left in the carpet, it lasts longer. Until the Steamin Demon, however, no portable carpet cleaning system had a vacuum system efficient enough to effectively remove large volumes of water.