The NZXT H6 Flow wins in 7 out of 8 comparable specs. Its biggest advantage is Max Cooler Height (196% better).
A4-H2O wins in 1 spec (2.5" Bays: 50% better).
Recommendation
Choose H6 Flow if you want the best overall performance — especially max cooler height.
Choose A4-H2O if 2.5" bays matters more to you.
| Spec | Lian LiA4-H2O | NZXTH6 Flow |
|---|---|---|
| Design | ||
| Type | Mini ITX | ATX Mid Tower |
| Side Panel | Tempered Glass | Tempered Glass |
| Weight | 3.5 | 7.2 |
| Compatibility | ||
| Max GPU Length | 322 mm | 365 mm+13% |
| Max Cooler Height | 55 mm | 163 mm+196% |
| Max PSU Length | 130 mm | 180 mm+38% |
| Max Radiator |
| 240 mm |
| 360 mm+50% |
| Motherboard Support | Mini ITX | ATX, Micro ATX, Mini ITX |
| Cooling | ||
| Included Fans | 0 | 2+100% |
| Storage | ||
| 2.5" Bays | 3+50% | 2 |
| 3.5" Bays | 0 | 1+100% |
| I/O | ||
| Front I/O | 1x USB-C, 1x USB-A 3.0 | 1x USB-C, 1x USB-A 3.0, Audio |
| Price | ||
| MSRP | $130 | $85−35% |
| Release Date | Jan 2022 | Mar 2024 |
