H28 vs SealMiner A3 Air
Side-by-side mining comparison: specs, per-algorithm benchmarks, efficiency and current profitability.
| Type | ASIC | ASIC | |
| Power | 2100 W | 3640 W | |
| Release | 2018-12 | 2025-09 | |
| Best opportunity |  BCHNetwork |  BTCNetwork | |
| Profit/day | $-2.97 | $3.85 | |
| Score | 49/100 | 74/100 | |
| View details → | View details → |
Benchmarks by algorithm
Best available benchmark per device; efficiency = hashrate per watt.
| Algorithm | H28 | SealMiner A3 Air | |
|---|---|---|---|
| SHA-256 | 28 TH/s2100 W · 13.33 GH/s/W | 260 TH/s3640 W · 71.43 GH/s/W |