The difference between the Bissell 2685A Power Steamer Heavy Duty and Bissell 2075A Powerfresh Slim Steam Mop is the use, included accessories, and color scheme.

• The 2685A is for indoor and outdoor surface cleaning, while the 2075A is for indoor use only.
• The 2685A comes with more accessories than the 2075A. For example, the 2685A comes with (4) Nylon Bristle Brushes for scrubbing everyday messes on above floor surfaces and (4) Grout Tools for removing dirt and grime from grout on sealed hard surfaces, whereas the 2075A comes with (2) Nylon Bristle Brushes and (1) Grout Tool.

  The 2685A comes with (2) Scrubby Mop Pad which is recommended for cleaning durable surfaces like tile, whereas the 2075A comes with (1) Scrubby Mop Pad and (1) White Mop Pad that is recommended for everyday use on delicate flooring like sealed hardwoods and laminate.

  The 2685A also comes with (4) Brass Bristle Brushes for scrubbing tough messes on durable surfaces, while the 2075A does not include.

• The 2685A is yellow and black whereas the 2075A is blue and white.

When it comes to functionality, design, cable length, power, etc. They are the same.

Some people said that the 2685A has continuous steam setting.
No, it does not. You have to push the trigger
underneath the handle of the handheld portion to release steam, just like the 2785A.
However, if you want, you could try to use velcro to wrap around the trigger to get continuous steam. (Do this at your own risk.)

The Bissell 2685A and 2075A are 3-in-1 Steam Mop and Handheld Steamer: upright steam cleaner, extended reach steam cleaner and a handheld steam cleaner.

• They are slim, have a swivel and low profile floor mop head.
• Both come with a variety of tools to tackle sealed hard floor and above floor cleaning jobs.
  An Extension Wand to help clean high and low areas,
  a Floor Mop Tool to use with mop pads to clean hard floors,
  a Flat Surface Tool and Mop Pad to clean large flat surfaces,
  a Fabric Steamer and Cloth to clean and refresh clothing, drapes and upholstered surfaces,
  an Angle Concentrator Tool to clean hard to reach spots, a Window Squeegee to clean windows, glass and mirrors,
  a Flat Scraper Tool to scrape off stuck-on messes,
  a Water Tank and a Wall Mount for storage.
• A Tool Box attached to the handheld pod for storing the Bristle Brush, Angle Concentrator Tool, Grout Tool, and Flat Scraper Tool onboard.
• They use a steam trigger that requires you to press the button all the time to keep the the steam going, not a lock design without getting your hand tired.
• Have 2 steam intensity settings: Low Steam for cleaning delicate surfaces and light everyday messes; High Steam for cleaning durable surfaces, tough stains and stuck-on or sticky messes.
  Steam will be ready in 30 seconds, heat up to over 200 degrees.
• The water tank capacity is 12 oz / 350 ml.
  It is recommended to use distilled water or demineralized water in place of tap water to prolong the life of the steam mop.
  Use other solutions may harm the machine and void the warranty.
• Corded and have a 25-foot power cord.
• 13-inch cleaning path width.
• Carry 2 year limited warranty.

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Bissell 1544A vs 15441 what’s the difference?
According to Bissell customer support, the only difference between Bissell 1544A and 15441 is where they’re sold.

The 1544A and 15441 PowerFresh Lift-Off Pet Steam Mop are 2-in-1 Steamer, can be used as a hard floor steamer or a handheld Steamer for above floor cleaning.

Just like the 2685A/2075A, both of the 1544A and 15441
come with a variety of tools to do floor and above floor cleaning. Such as:
a Floor Mop Tool and 2 mop pads,
a Flat Surface Tool and Mop Pad,
a Fabric Steamer and Cloth,
an Angle Concentrator Tool,
a Window Squeegee,
a Flat Scraper Tool,
and a Detachable Water Cup.

The 1544A and 15441 also come with odor eliminating fragrance discs to help remove pet odors.

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The main difference between the Bissell Power Steamer Heavy Duty 2685A / Bissell Powerfresh Slim Steam Mop 2075A and Bissell PowerFresh Lift-Off Pet Steam Mop 1544 / 15441 are as follows:

• Design
  The 2685A/2075A are 3-in-1 machines while the 1544/15441 are 2-in-1 steamers.
  the 2685A/2075A have a detachable extension tube which allows you clean those hard to reach high and low spots, whereas the 1544/15441 do not have the wand.
  However, the 1544/15441 come with a extension hose whereas the 2685A/2075A do not include.
• Steam Control
  The 2685A/2075A use a trigger type control which you should keep on pressing to activate steam, whereas the 1544/15441 do not require you to constantly holding down the button to release steam, you just turn on the machine, then select low or high steam setting to get continuous steam.