Bitmain Antminer S21 official reference
Official Antminer S21 reference: 200 TH/s, 3,500 W, 17.5 J/TH and the exact 220-277 V single-input electrical boundary.
Quick answer
The Bitmain Antminer S21 official reference is a Bitcoin miner rated about 200 TH/s at roughly 3,500 W (about 17.5 J/TH).
Full Specifications
| Model | Bitmain Antminer S21 official reference |
|---|---|
| Model Number | Antminer S21 |
| Manufacturer | Bitmain |
| Algorithm | SHA-256 |
| Hashrate | 200 TH/s |
| Power Consumption | 3,500 W |
| Calculated nominal efficiency | 17.5 J/TH |
| Cooling | Air |
| Voltage Range | 220-277 V AC; 47-63 Hz; single 20 A input |
| Operating Temperature | 0 C to 45 C |
| Dimensions | 400 x 195 x 290 mm including PSU |
| Weight | 15.4 kg net including PSU |
| Interface | RJ45 Ethernet 10/100M |
| Status | OEM support reference |
Official exact-model reference: Bitmain documents the Antminer S21 at 200 TH/s, 3,500 W typical wall power at 25°C, and 17.5 J/TH. The cited specification does not print tolerances for these headline values, so none are invented here.
Critical 220–277 V electrical boundary
The official input is 220–277 V AC, 47–63 Hz, through a single 20 A input. Do not transfer the 200–240 V or dual-input assumptions of earlier S19-family hardware. Installation requires qualified conductors, connector, grounding, overcurrent protection, isolation, airflow, and facility design for the physical nameplate and local code.
Physical and environmental reference
The server including PSU is 400 × 195 × 290 mm and 15.4 kg net; packaged dimensions are 570 × 316 × 430 mm and gross weight is 17.2 kg. Network access is RJ45 Ethernet 10/100M.
The official operating range is 0–45°C, storage is −20–70°C, relative humidity is 10–90% non-condensing, and altitude is up to 2,000 m. Maximum operating temperature derates by 1°C per 300 m above 900 m.
Evidence boundary
The official product specification reviewed does not establish a noise figure, ASIC type/count, board count, launch date, list price, current-sale status, tuning envelope, or residential suitability. Its copied secure-boot note refers to a different product series and is not treated as S21 evidence.
Firmware and recovery
The reviewed Bitmain factory-firmware board-selection table does not list S21. Do not infer a controller category, recovery medium, lock state, or cross-flash path from the model name.
- Identify the exact control board and installed version.
- Use only the exact current manufacturer support/download entry after identity is resolved.
- For no boot, unknown board, package mismatch, interrupted writing, instability, or electrical and thermal symptoms, request Antminer diagnosis.
Exact purchase configuration
View the separate S21 product listing. Confirm condition, included PSU/cord, warranty, stock state, and exact label there.
Primary source: Bitmain S21 specification. Reviewed August 27, 2026.