Durability

• A frequent problem of steam carpet cleaners for the home market is the poor quality of plastic parts. Durable parts can reduce problems of broken water tanks, hoses and tools. Escaped fluid can cause a fall or even an electrical shock.
  
  

Tank Capacity

• Tank capacity determines how frequently the tank needs emptying. Certain models have a smaller system with a half-gallon of cleaning solution and water in one tank and residue in another tank. This smaller system may offer good dollar value, but requires more time to empty the smaller tank in multiple trips. More expensive models can feature a triple tank for cleaning solution, clean water and residues in separate areas.
  
  

Power

• The power and heat of the steam carpet cleaner can mean the difference between a wet carpet and a dry one. A powerful suction that efficiently lifts the wet residue from the carpet fibers can reduce the chances of developing mold, allergens or other unpleasant growths. Buyers should also consider the width of the cleaning path, such as a narrow 9-inch cleaning path on economical models or a wide 12-inch path for more upscale models.