BISSELL ProHeat 2X LiftOff Pet with Antibacterial Carpet Cleaner Hex Cap Screws Patented multi flue tank design: proprietary Maple Stair Nose Patented multi flue tank design: proprietary steel formulation Eastman thermal expansion tanks are designed to prevent backflow from residential water heaters Series Name ProHeat 2X LiftOff Pet with Antibacterial Type Upright For Use on Carpet and Rugs Yes For Use on Stairs Yes For Use on Bare Floors No For Use on Low Pile Carpets Yes For Use on Upholstery Yes HEPA Filter No Single or Dual Reservoir Dual Rotating Brush Yes Tank Capacity (Gallons) 0 cars and more Heatwave Technology(R)