Description Bitmain Antminer S21 Immersion 215–239TH/s SHA-256 Bitcoin Miner Bitmain Antminer S21 Immersion is a high-efficiency SHA-256 ASIC miner built for professional Bitcoin mining. Designed by Bitmain, it delivers a steady hashrate within the 215–239TH/s range while maintaining an energy efficiency of about 16W/TH(±5%). As a result, power usage is easier to estimate and plan over time. In addition, this miner supports SHA-256 cryptocurrencies. Because of its durable hardware design and proven thermal behavior, it’s commonly used in mining farms, hosting facilities, and well-prepared home setups. For best results, electrical capacity and airflow should be sized correctly. Otherwise, performance can decline as temperatures increase. Technical Specifications Model S21 Immersion Algorithm SHA-256 Hashrate Variants 215TH, 239TH Power Consumption 3440W, 3824W Efficiency 16W/TH(±5%) Power & Connectivity Phase 3 Input Voltage 380~480 Maximum Current 10A Network Connection RJ45 Ethernet Environmental Requirements Operating Temperature 0–45°C Operating Humidity 10–90% RH (non-condensing) Operating Altitude ≤ 2000 m Important Notes Performance Tolerance: Values shown are typical measurements. Hashrate may vary by ±3%, and power consumption may vary by ±5%. Test Conditions: Power data is measured at an inlet air temperature of 25°C. Electrical Safety: Always use the correct input voltage to prevent hardware damage. Altitude Adjustment: Above 900 m, the maximum operating temperature decreases by approximately 1°C per additional 300 m. For long-term operation, the Antminer S21 Immersion performs best in stable conditions with consistent cooling and clean, reliable power delivery. Regular monitoring and correct environmental control help reduce downtime and maintain dependable performance over time. Browse more devices in our Bitcoin Miners collection, explore compatible accessories in our Mining Power Cables section, and find essential replacement components in our Miner Parts category. For miner manuals, see the product manuals .
