Miner comparison
Antminer S21 XP Hyd. vs SealMiner A3 Pro 660T
Both are hydro-cooled machines for SHA-256 (Bitcoin) mining on three-phase AC, each rated at 35 °C inlet coolant. Bitmain rates the Antminer S21 XP Hyd. at 473 TH/s on 5,676 W (12 J/TH); Bitdeer rates the SEALMINER A3 Pro Hydro at 660 TH/s on 8,250 W (12.5 J/TH). The A3 Pro Hydro gives about 40% more hashrate for about 45% more power, so the S21 XP Hyd. uses about 4% less electricity per terahash. The S21 XP Hyd. takes 380–415 V at up to 12 A and coolant at 20–50 °C; the A3 Pro Hydro takes 380–480 V at up to 17 A and coolant at 20–55 °C. The S21 XP Hyd. measures 339 × 173 × 207 mm and weighs 13.8 kg net; the A3 Pro Hydro is a flat 482 × 665 × 86 mm unit weighing 20.5 kg. The table below and the calculator work out what these figures mean with current network data.
Figures: Bitmain and Bitdeer specification pages for Antminer S21 XP Hyd. and SEALMINER A3 Pro Hydro, checked 2026-10-10.
| Compare |  Bitmain Antminer S21 XP Hyd.Available |  Bitdeer SealMiner A3 Pro 660TAvailable |
|---|---|---|
| Price | ||
| Price | $5,889.05 | $9,024.05 |
| Price per TH/s | $12.45/TH | $13.67/TH |
| Condition | New | New |
| Specifications | ||
| Hashrate | 473 TH/s (±3%) | 660 TH/s (±10%) |
| Power consumption | 5,676 W (±5%) | 8,250 W (±10%) |
| Efficiency | 12 J/TH | 12.5 J/TH |
| Algorithm | SHA-256 | SHA-256 |
| Input voltage | 380–415 V AC | — |
| Electrical phase | Three-phase | — |
| Cooling type | Hydro-cooled | Hydro-cooled |
| Coolant inlet temperature | 20–50 °C | — |
| Coolant flow | 8–10 L/min | — |
| Dimensions (L × W × H) | 339 × 173 × 207 mm | — |
| Net weight | 13.8 kg | — |
| Operating economics | ||
| Electricity cost / day at $0.06/kWh | $8.17 | $11.88 |
| Est. revenue / day | $16.79 | $23.43 |
| Est. net / day at $0.06/kWh | $8.62 | $11.55 |
| Break-even electricity price | $0.123/kWh | $0.118/kWh |
Green marks the better value in a row (higher hashrate; lower power, J/TH, noise, weight, price and electricity cost). Specifications are as recorded for each product; “—” means the value is not stated. Economics are estimates at network conditions of 2026-10-28, $0.06/kWh, 2% pool fee and 100% uptime, and are not a forecast of earnings.
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