The difference between bissell 1551, 1548, 1986 and 2007 are as follows.
The Bissell ProHeat 2X Revolution 1551 is the basic model, sold at Walmart.com, the ProHeat 2X Revolution Pet Carpet Cleaner 1548 is the Pet version while the ProHeat 2X Revolution Pet Pro Carpet Cleaner 1986 and 2007 are the Pet Pro version.
There are some obvious differences between the basic/Pet and the Pet Pro, while the basic and Pet are the same except for the color and accessory, the 2 Pet Pro models 1986 and 2007 are almost the same except for the 2007 has a longer hose and comes with extra tools.
One of the main differences between the basic 1551/Pet 1548 and the Pet Pro 1986/2007 is that the Pet Pro feature the foot control CleanShot Pretreater that pretreat tough stains and spots, whereas the basic 1551/Pet 1548 do not have it.
Another difference is that the 1986 and 2007 have removable roll cover design which makes it easy to access to the brush roll for cleanup after use. The basic 1551/pet 1548 do not have such design.
Other differences between them:
* Cord Length. The 1551/1548 have 22 foot power cord versus 25 foot cord on the 1986 and 2007.
* Hose Length. The 1551/1548 have 7 foot hose while the 1986 has 8 foot hose, the 2007 has a 10 foot cord.
* Warranty. The 1551/1548 carries 3 year limited warranty versus 5 year on the 1986 and 2007.
* Weight. The 1551/1548 weighs 18 lbs versus 19 lbs on the 1986 and 2007.
The 1551 comes with a 3 inch tough stain tool,
the 1548 comes with a 3 inch tough stain tool and a pet stain tool,
the 1986 comes with a 3 inch tough stain tool and a 2-in-1 pet dusting brush,
the 2007 comes with a 3 inch tough stain tool, a 2-in-1 pet dusting tool, a stain trapper tool and a 3-in-1 stair tool.
* Included Detergent.
The 1551 comes with 2X 8oz. professional formula, 8 oz. deep clean + antibacterial formula,
the 1548 comes with a trial size 8 oz. bottle of deep clean + antibacterial formula and trial size 8 oz. bottle of professional deep cleaning formula,
the 1986 and 2007 come with a trial size 8 oz. bottle of professional pet urine eliminator + oxy formula and a trial size 8 oz. bottle of pet stain & odor antibacterial formula.
The 1986 and 2007 are about $50 more expensive than the 1548, and 1551 is like $10 cheaper than 1548.
The 1551 is in black with yellow, the 1548 is black with orange, the 1986 is Sparkle Silver with Grapevine Purple Accents, the 2007 is Sparkle Silver with Grapevine Purple and Cha Cha Lime Accents.
If you know other difference between them, please share below.
According to Bissell, these bissell carpet cleaners can be used on bare floors, but required a bare floor accessory, part number is 1606611, which can be purchased separately.