ASICs
Antminer S21
Bitmain’s flagship air-cooled miner, achieving sub-17.5 J/TH efficiency and delivering robust, high-performance operation designed to maximize profitability in high-difficulty market conditions.
Air cooled
About Bitmain Antminer S21
The Bitmain Antminer S21 is the definitive flagship of Bitmain's air-cooled lineup, marking a massive leap forward in mining technology. As the first air-cooled miner to achieve an efficiency rating below 17.5 J/TH, the S21 redefines what is possible for standard mining infrastructures. It is built to weather the volatility of the crypto market, providing miners with a robust, high-performance tool that maximizes profitability even in high-difficulty conditions.
Available in: 188 TH/s, 195 TH/s, 200 TH/s
Key Specifications
Feature | Specification |
Model | Antminer S21 |
Hashrate | 200 TH/s ± 3% (Max) |
Power Consumption | 3,500 W ± 5% |
Power Efficiency | ~17.5 J/TH |
Algorithm | SHA-256 (Bitcoin) |
Cooling System | Air Cooled (4 x High-Speed Fans) |
Voltage | 220V ~ 277V AC |
Dimensions | 400mm x 195mm x 290mm |
Net Weight | 15.4 kg |
Unmatched Performance
Designed for the SHA-256 algorithm, the Antminer S21 delivers a commanding hashrate of 200 TH/s (with other variations available at 188 TH/s and 195 TH/s). This raw processing power allows it to outperform significantly larger and more power-hungry predecessors. By packing this level of throughput into a standard form factor, the S21 allows farms to double their hashrate density without building new facilities.
Robust Air Cooling System
The S21 utilizes a refined air-cooling architecture designed for durability and ease of maintenance.
Dual-Fan Intake & Exhaust: Equipped with four high-speed industrial fans, the unit creates a powerful wind tunnel effect to dissipate heat rapidly from the hash boards.
Higher Thermal Limit: Capable of operating in ambient temperatures up to 45°C, the S21 is more resilient to heat than the S19 series, making it a versatile choice for hotter regions (like Texas or the Middle East).
Universal Deployment: Because it uses standard air cooling, it fits easily into existing racks without the need for water piping or immersion tanks.
Efficiency & Industrial Design
The defining feature of the Antminer S21 is its groundbreaking efficiency of 17.5 J/TH. Consuming approximately 3,500W, it extracts more Bitcoin per kilowatt-hour than almost any other air-cooled machine on the market. The miner features a "T-shape" design (integrated PSU) that is compact and stable, compatible with standard C19/C20 power cables and 220-277V inputs commonly found in industrial data centers.
Conclusion
The Bitmain Antminer S21 is the gold standard for modern Bitcoin mining. Whether you are running a home setup or a massive industrial farm, the S21’s combination of 200 TH/s power and 17.5 J/TH efficiency safeguards your operation against energy price fluctuations and future halving events.