These two Karcher walk-behind outdoor hand push sweepers are human powered, they do not use electricity nor gas.

They are similar, however, there are some difference on the design and the size.

• Handle
  The Karcher S 4 Twin has continuously adjustable handle, you will need to bend down to twist the knobs to adjust the height.
  Whereas the S 6 has 2-position height adjustable handle which does not require you to bend down to adjust the height.
• Side Brush
  Both have dual side brushes. However, the Karcher S 6 Twin has flexible height adjustment of the side brushes to fit different cleaning needs whereas the S 4 have fixed height side brushes.
• Size
  The Karcher S 6 Twin are larger.
  S 6 Twin dimensions are 36.5″ x 34.3″ x 40.6″ whereas the dimensions of S 4 are 29.9″ x 26.3″ x 37″.
  The working width with side brushes of S 6 Twin is 33.9″ versus 26.8″ on the S 4 Twin.
  The S 6 Twin can sweep an area up to 32000 square feet per hour versus 26,000 square feet per hour on the S 4 Twin.
  The waste container capacity of S 6 Twin is 38L versus 20L on the S 4 Twin.

Sweeper	Karcher S 4 Twin Walk-Behind Outdoor Hand Push Sweeper	Karcher S 6 Twin Walk-Behind Outdoor Hand Push Sweeper
Model	S 4	S 6
MSRP	$189.99	$399.99
Power Source	Human Powered	Human Powered
Noise Level	42dB	42dB
Max Area Cleaned Per Hour	26,000 square feet	32,000 square feet
Adjustable Handle	continuously adjustable handle	2-position height adjustable handle
Foldable handle for Storage	Yes	Yes
Housing	Plastic	Plastic
Frame	Plastic	Plastic
Stand-alone Waste Container	Yes	Yes
Waste Container Capacity	5.3 gallons/20 L	10 gallons/38 L
Tool-free Side Brush Attachment	Yes	Yes
Side Brush	2	2
Height-Adjustable Side Brushes	No	Yes
Cleaning Path Width	26.8"	33.9"
Assembled Dimensions (WxDxH)	29.9 x 26.3 x 37	36.5 x 34.3 x 40.6
Weight without accessories	22.5 pounds	32.6 pounds
Weight including package	27.1 pounds	37.9 pounds
Warranty	1-year limited warranty	1-year limited warranty
Origin	Lithuania	Lithuania