Which is better for cleaning carpets?

The Stanley. Its 4.0 HP motor and larger tank suit carpet and floor cleanup, and its listing names carpet as the top use case. The Koblenz is smaller and less powerful.

Which has more suction?

The Stanley, at 4.0 HP versus 2 peak HP for the Koblenz. Expect the Stanley to pull heavier debris and more water.

Is the Koblenz worth the extra money?

Only if the 20 ft cord or the sanitizer kit matters to you. Otherwise the Stanley gives more power and capacity for $5.58 less at the prices dated November 7, 2026.

Which is easier to carry around the house?

The Koblenz is described as lightweight and portable, and its 20 ft cord means fewer outlet changes. The Stanley weighs 11.22 lb and has wheels but only a 6 ft cord.

Does the Koblenz really kill germs?

Koblenz says its sanitizer kit kills 99% of germs and bacteria. That is the manufacturer's claim; the Stanley has no comparable feature.

Which holds more water?

The Stanley. It lists a 5 gal water tank capacity within a 6 gal drum, against a 3 gal total capacity on the Koblenz.

Stanley 6 Gallon Wet/Dry Vacuum vs Koblenz WD-390k2 Wet/Dry Vac

Buy the Stanley if you want more suction and a bigger tank for heavy garage or carpet cleanup; it is also the cheaper of the two at $57.39 at Home Depot as of November 7, 2026. Buy the Koblenz if you need a long cord for reach or want the sanitizer kit for germ-prone messes, at $62.97 at Walmart as of November 7, 2026. The Stanley wins on raw power and capacity for about $5.58 less.

Today the Stanley 6 Gallon Wet/Dry Vacuum costs $5.58 less at its best price.

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