Some main difference between Hoover UH70120 and UH70400 are:
1, There is no Manual height adjustment for floors on the UH70400, it uses an automatic height adjustment mechanism while the UH70120 use manual adjustment which has 5 options.
2, The UH70120 has cord rewind while the UH70400 does not have.
3, The UH70120 has no Brush Off switch while you can turn off brushroll for bare floor cleaning on UH70400.
For more details, read the side by side comparison table below:
Compare Hoover UH70400 and UH70120
| Hoover UH70120 WindTunnel T-Series Rewind Plus Bagless Upright Vacuum Cleaner | Hoover UH70400 WindTunnel® Air™ Bagless Upright | |
|---|---|---|
 |  |
|
| Design | Upright | Upright |
| Price | $129.99 at Hoover.com on July 24, 2014 | $159.99 at Hoover.com on July 24, 2014 |
| Bagged or Bagless | Bagless | Bagless |
| Dirt Bin Capacity | 1.2 liters | |
| Bottom-Release Bin | Yes | Yes |
| Cord Length | 27 ft | 30 ft |
| Auto Cord Rewind | Yes | No |
| Amps | 12 Amps | 11 Amps |
| Motor Watts | 1200 Watts | |
| Motorized Brushroll | Yes | Yes |
| Brushroll On/Off | No | Yes |
| Height Adjustment Type | Manual, 5 Settings | Automatic |
| Washable Filter | Yes | Yes |
| HEPA Filtration | Yes | Yes |
| Headlight | No | No |
| Weight | 16.5 lbs | 12.4 lbs |
| Cyclonic Action | Dual | Multi-Cyclonic |
| WindTunnel Technology | Yes | Yes |
| Nozzle Width | 13.5" | 11" |
| Edge Cleaning Brush | No | No |
| Self-propelled | No | No |
| Handle | D-Shaped Handle, Not Detachable, not Telescopic | Detachable Telescopic Handle |
| Deep Recline Handle recline flat to clean under furniture. | No | Yes |
| Hose Type | stretch hose | stretch hose |
| Hose Length | 8' | 12' |
| Included Tools | Air Powered Hand Tool, Crevice Tool, Dusting Brush, Upholstery Tool | 3-in-1 Dusting, Crevice, and Upholstery Tool |
| Cleaning Wand | Yes | Yes |
| Color | Gray and Green | Gray |
| Warranty | 2 year limited warranty | 2 year limited warranty |
| Manual | download uh70120 manual | download uh70400 manual |
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Which one is better to buy?
If you need a lighter one, choose the UH70400; if you would like to get one that has retractable cord, then buy the UH70120.