The Hoover SmartWash/Pet and Power Scrub Deluxe/Elite Pet are carpet extractors for household use. There is difference and similarity between them. We will compare them below.

images from Hoover infomercials

The Power Scrub series has a large range of models. For more info, you can read the comparison of the Hoover Power Scrub carpet washer models.
As for the As for the Deluxe (FH50150) and Elite Pet (FH50251PC), the Elite is an upgrade version of the Deluxe. The Elite is larger, has wider cleaning path width, bigger tanks, adds side brushes to help edge cleaning, and a mode selector to choose between quick cleaning or deep cleaning mode to fit different cleaning needs.

The Hoover SmartWash has original version such as FH52000 and Pet version such as FH53000, they are very similar, the only difference you should know is the Pet version has a removable handle that can be used to pre-treat stains. Otherwise, they are almost the same. The FH52000 is cheaper, but has the core functions as the FH53000. You can learn more details by reading the comparison of FH52000 and FH53000.

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Below we will compare the SmartWash original version and the Power Scrub Elite Pet.

• Brushes Design
  The Power Scrub Elite Pet uses spin scrub brushes, these counter rotating brushes spin, not roll.
  The SmartWash uses two rollers, the brushes rolls. According to user reviews, the SmartWash which has rotating brushes clean deeper whereas the Power Scrub Elite Pet is more gentle on carpet.
  
  

  images from Hoover infomercials

• Cleaning Mode
  The Power Scrub Elite Pet has two cleaning modes: Quick Clean and Deep Clean.
  The Quick Clean mode is designed for a quick clean, rugs/carpets dry in less than 1 hour.
  The Deep Clean mode is best for a thorough, deep rug/carpet clean. It takes longer to dry.
  The SmartWash does not have a mode selector.
  
  

  images from Hoover infomercials

• Rinse/Wash Selector
  The Power Scrub Elite Pet has a Wash/Rinse dial to choose between Wash and Rinse mode.
  The SmartWash does not have this selector. When you want to rinse the carpet/rug with clean water only, just remove the formula tank.
  
  

  images from Hoover infomercials

• Operation
  These carpet washers are easy to use. However, there is difference on the operation.
  When using the Power Scrub Elite Pet, you need to choose the Quick Clean or Deep Clean mode first, then select Wash or Rinse.
  And then press the Water/Solution trigger for a forward and backward wet stroke, release the trigger and move the machine forward and backward for a dry stroke.
  When using the SmartWash, it will be a bit different. Because the SmartWash has no Clean Mode selector, no Wash/Rinse selector, no Water/Solution trigger to press.
  It features automatic cleaning. You only need to move the machine forward and it will dispense the optimal amount of water and formula automatically, move it backward and it will pick up water to dry. It also features a Dry Only mode that just extracts remaining water to dry the carpets/rugs faster.
• Hard Floor Cleaning Ability
  Though both of them are carpet cleaners, the Power Scrub Elite Pet can be used with a hard floor Squeegee Tool to clean non-carpeted surfaces such as tile, whereas the SmartWash does not have this optional accessory.
  
  

  image from Hoover infomercial

• Tank Size
  The Power Scrub Elite Pet has larger tank capacity than the SmartWash which has 1 gallon water tank.
• Warranty
  The Power Scrub Elite Pet carries two year limited warranty while the SmartWash is backed by five year limited warranty.
  You can download the manuals to learn what is covered by the warranty.
  Manual PDF download links:
  Power Scrub Elite Pet User Guide:
  https://tti.a.bigcontent.io/v1/static/FH50251_Hoover_User_Manual
  SmartWash manual:
  https://tti.a.bigcontent.io/v1/static/FH52000_SmartWash_GL_Manual
• Price
  The Power Scrub Elite Pet is cheaper than the SmartWash.

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More information:
• Both use foot pedal power control.
• No automatic cable retractor, power cord need to be wrapped by hand.
• Brushes can be removed without using any tools.
• You cannot turn the brush off.
• Side brushes to help edge cleaning.
• 12-inch cleaning path width.
• 8-foot hose.
• 22-foot power cord.
• Both of them have removable and separate clean water tank and dirty water tank.
• Featuring Heat Force technology to apply hot air onto carpet/rug to quicken the drying.
• They do not have a heater to warm up the water.
• You will void the warranty if you use formula from other brands.
• These machines are carpet washers, they do not function as a dry vacuum, you have to vacuum before using these extractors.
• It is recommended to empty the tanks before putting them away to avoid leakage issues.
• Don’t use the machines to clean upholstery fabric marked “S” (“solvent/dry” clean only).
• Both come with accessory hose and tools for above floor cleaning.

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Overall, the Hoover Power Scrub Elite Pet has larger tanks, it can be used to clean certain hard floors with the optional squeegee tool. While the SmartWash features automatic cleaning technology, it’s easier to use. According to user reviews, the SmartWash is also more comfortable to use and does a better job on cleaning.