Below are some difference between Oreck commercial U2000R-1 and 2100RHS:
Oreck XL 2100RHS vs U2000R-1
images from manufacturer
Carry Handle
This is one of the key difference.
The Oreck U2000R-1 has a Rear Carry Handle that the 2100RHS does not have.
Cord Length
The U2000R-1 has 40 feet pigtail cord while the 2100RHS has a 35 feet standard cord.
Outer Bag Size
The U2000R-1 has a larger outer bag.
Color: Red vs Blue
As you can see from the images, the U2000R-1 is Red whereas the XL 2100RHS is Blue.
Price
The retail price of Oreck U2000R-1 is about $20 more expensive than the XL 2100RHS.
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If you know other difference between Oreck XL 2100RHS and U2000R-1, please share below.