The difference between FH50150 (Hoover Power Scrub Deluxe Carpet Cleaner), FH50140 (Power Scrub Carpet Washer), FH50130 (Turbo Scrub Carpet Washer) are as follows.
FH50130 vs FH50150
The FH50150 is the Deluxe version of the FH50140, the main machine is the same as FH50140 except for the color scheme, FH50140 is Blue whereas the FH50150 is Red.
And the Deluxe version comes with more attachments, including a SpinScrub Powered Hand Tool, 6-inch wide Stair Tool, Upholstery Tool, and Crevice Tool. Whereas the FH50140 comes with only the Upholstery Tool.
The difference between FH50130 and FH50140/FH50150 is that the FH50140/FH50150 feature Wash/Rinse Selector, you can select WASH mode to wash your carpets with soap & water, and then set to RINSE to clean carpet with water only to remove soap residue.
Whereas the FH50130 has only Wash mode. To remove the residual carpet cleaning solution from carpet, you have to fill the solution tank with only hot tap water.
The FH50130 is gray, comes with only Upholstery Tool.