Bissell 5207A vs 14259
images from manufacturer

The key difference between Bissell Little Green Proheat 14259 and Bissell SpotClean 5207A is that the Little Green Proheat has a Built-in Water Heater to heats tap water up to 25 degrees hotter whereas the SpotClean 5207A does not have a heater, instead, it features Bissell’s Heatwave Technology which uses the motor heat to maintain the water temperature.
The other differences are the tank capacity, amps, included tools, weight, color, warranty.
* The dirty tank capacity on the Little Green Proheat is 48 oz versus 37 oz on the SpotClean.
* The Little Green Proheat uses 9 amp motor versus 3 amp on the SpotClean.
* The Little Green Proheat is heavier than the SpotClean.
* The Little Green has a 2-in-1 crevice tool and a 3 inch stan tool whereas the SpotClean has a 3 inch stain tool and a 4 inch deep reach tool.
* The Little Green carries one year limited warranty versus 2 year warranty on the SpotClean.

Similar things they have.
Portable cleaner for small spots;
separate clean water tank and collecting tank;
detergent and clean water should be mixed manually and stored in the clean water tank;
both come with trial size formula.

Download manuals to learn more.
Little Green Proheat 14259 manual
http://www.bissell.com/~/media/site%20us/documents/user%20guides/14259/bissell_user_guide_little_green_proheat_14259.pdf?la=en

SpotClean manual
http://www.bissell.com/~/media/site%20us/documents/user%20guides/52074/bissell_user_guide_spotclean_proheat_52074.pdf?la=en

If you own Bissell SpotClean or Little Green Proheat, please share your opinions below to help others buy the right one.

Bissell 3624 vs 5207
images from manufacturer

All of these 3 Bissell portable spot cleaners have separate clean and dirty water tank, but they do not have water heater. You should fill the clean water tank with hot tap water mixed with detergent, then use the included hand tools with the flexible hose to clean spot and stains.

The Bissell SpotClean 5207a and SpotClean Proheat 5207f are the same machine, they only have slightly different tools.
The difference between SpotClean Pro 3624 and SpotClean 5207a / SpotClean Proheat 5207f are as follows.

Tank Capacity
The Pro version has larger tank capacity.

Heatwave Technology
The SpotClean and SpotClean Proheat feature the Bissell Heatwave Technology that directs the motor heat to maintain the water temperature during cleaning.
Whereas the Professional does not have this feature.

Motor Amps
The SpotClean and SpotClean Proheat have a 3 amp motor whereas the Professional uses 5.7 amps motor.

Cord Length
The Prefessional has longer power cord.

Tool
All of them come with 2 hand tools, however, the larger tool on the Professional model is a bit wider.

Weight
The SpotClean / SpotClean Proheat are lighter.

Pirce
The Professional is more expensive.

All of the carry 2 year warranty limited warranty and come with trial size cleaning formula.

Bissell Spotbot vs SpotClean
images from manufacturer

The Bissell SpotClean 5207a and Proheat 5207f are the same aside from color and included accessories.
The Spotbot 78R5 and Spotbot Pet 33N8a/33N8 are the same machine except for color and included detergent.

Both of the Bissell Spotbot and SpotClean are designed for removing spots and stains such as pet stains on carpets, rugs, stairs, upholstery, auto interiors, etc. But they are different from each other, here are some major differences between them.

Design
Bissell Spotbot/Spotbot Pet have a handsfree function that allows you to remove stains with a push of button. The machine has Spiral Brush on the bottom and also has preset cleaning cycles that spay solution, brush, and suck up water automatically. You just press a button, leave it on a stain, and it would clean the surface for you.
While the SpotClean/SpotClean Proheat does not have Spiral Brush, it only has hand tools that you can use to remove stains.

Tank
The tanks on both machines are small, however, the tanks on the SpotClean is larger.

Warranty
The Spotbot/Spotbot Pet carries 1 year limited warranty whereas the SpotClean/SpotClean Proheat is backed by 2 year limited warranty.

Size & Weight
The Bissell SpotClean/SpotClean Proheat is larger, but lighter.
Maybe this is because of the lack of spiral brush.

Heatwave Technology
The SpotClean/SpotClean Proheat features the Bissell Heatwave Technology which utilizes the heat that generated by the motor to maintain the temperature of the hot tap water you filled. Whereas the Spotbot/Spotbot Pet does not have this Heatwave Technology.
And both of them have no water heater, so you have to fill the clean tank with hot tap water.

Accessories
There are also difference on the included hand tools and detergents.
The Spotbot/Spotbot Pet comes with a 3″ Tough Stain Brush.
While the SpotClean/SpotClean Proheat also has the 3″ Tough Stain Brush and one larger hand tool for cleaning stains from stairs, upholstery and other hard-to-reach places.

We will discuss the difference between Bissell Big Green 86T3 and Bissell DeepClean Lift-Off 66E1 carpet cleaners within this post.

Bissell Big Green vs DeepClean Lift Off
images from manufacturer

* Customer Rating
The Big Green receives higher customer satisfaction rating and it’s selling better than the lift off.

* Design
One of the biggest difference between them is the design.
The DeepClean Lift Off offers the versatility of 2 cleaners in one – Upright Cleaner with dual DirtLifter PowerBrushes for carpet and rug cleaning and Detachable Portable Spot Cleaner for stairs, upholstery, spots and stains cleaning.
While the Big Green is only an upright cleaning machine without detachable spot cleaner design.

* Tank Capacity
The Big Green 86T3 has a larger tank than the DeepClean Lift Off.
The tank capacity are 1.75 gallons versus 0.75 gallons.

* Flow Indicator
The Big Green has a Flow Indicator that mornitors the levels of water and detergent, lets you know when to add more water and detergent. While the Lift Off has no flow gauge.

* Cleaning Path Width
The Big Green has a cleaning path width of 10.5″ versus 12″ on the DeepClean Lift Off.

* Hose Length
The hose length of the Big Green is 9 foot versus 5 foot on the DeepClean Lift Off.

* Cord Length
The Big Green has a 25 foot cord while the cord length of the DeepClean Lift Off is 22 foot.

* Handle
The handle on the Big Green is adjustable to suit your height and foldable for easy storage, while the handle on the Lift Off is NOT adjustable nor foldable.

* Included Accessories
The Big Green 86t3 comes with a 6″ Stair Tool and a 24-oz. BISSELL 2X Professional Deep Cleaning Formula while the Lift Off includes a 3″ Tough Stain Tool, a Spraying Crevice Tool and 8 oz. Bissell 2X Deep Cleaning Formula.

* Heatwave Technology
Heatwave Technology – the heat of the motor helps maintain water temperature throughout the cleaning process.
The Lift Off features Heatwave Technology while the Big Green does not.
Both of them do not have a water heater.

* Edge Brush
The DeepClean Lift Off has edge brushes while the Big Green has no edge brushes.

* Surround Suction
According to Bissell, Surround Suction is the suction along the sides and front of the nozzle that helps surfaces dry fast.
The Lift Off has the Surround Suction while the Big Green does not.

* Price
The Big Green is more expensive than the DeepClean Lift Off.
On bissell.com, the list price of Big Green is $469.99 versus $259.99 of the Lift Off.

* Weight
The Big Green is much heavier than the Lift Off, about 15 pounds.

* Warranty
The Big Green carries a 5 year limited warranty while the DeepClean Lift Off is backed by 3 year limited warranty.

If you own the Bissell Big Green / Bissell DeepClean Lift Off, please share your experience below to help people make an informed purchase, thanks.

P.S.
Download manuals to learn more about these 2 bissell carpet shampooers:
DeepClean Lift Off Manual
http://www.bissell.com/~/media/site%20us/documents/user%20guides/66e14/bissell_user_guide_deepclean_lift_off_carpet_cleaner_66e14.pdf
Big Green 86T3 Manual
http://ecx.images-amazon.com/images/I/B1pw1kZd6GS.pdf