The Cirrus C-CR89, S89 comes standard with a 12 AMP 1200 Watt AMETEK 2-Stage Motor (stages indicate how many suction fans the motor has). The 2-Stage motor will have more suction power, and run cooler then 1-stage motors. AMETEK motors are one of the most durable motors on the market. You can easily expect to get 20-25 years of trouble free performance out of this motor. The S89has a 110 suction rating (waterlift) The Cirrus CR89 is the top of the line for Cirrus residential models. This machine is the only model that comes with a 2 stage (2 fan) motor. Because of the 2 fans, and added suction power, this model is the best Cirrus for pet hair. The 2 stage motor is also a more durable motor. The extra fan helps the motor run cooler, and more efficient. Because of the better motor, GoVacuum is including a 10 year motor warranty at no charge on the Cirrus CR89 The CR89 also is the only residential model that comes packaged with the a variable speed motor control. This allows you to slow the brush speed and the suction power, when doing delicate oriental rugs, or Berber carpeting. Rather then straddling the rug and fighting with it to try and it hold down, simply lower the variable suction control so you are not sucking the rug into the vacuum cleaner. The CR89 also comes standard with HEPA exhaust filter. For homes with allergies or breathing issues, the Cirrus CR89 is ideal. The HEPA filter is very efficient at capturing microscopic particles that cause allergy sufferers major problems such as dust mites, pollen, animal dander, and bacteria. The sealed motor housing prevents any air from leaking, and forces the air through the HEPA filter which makes it very effective. r# n# r# n#C-CR89