ASICs
Antminer S21 Immersion
An oil-cooled S21 variant designed for immersion tanks, enabling higher sustained performance, greater hashrate density, and silent, dust-free operation without thermal throttling.
Immersion cooling
About Bitmain Antminer S21 Immersion
The Bitmain Antminer S21 Immersion is the specialized oil-cooled variant of the legendary S21 series, engineered to unlock the full potential of the 7nm chip architecture through superior thermal management. Unlike its air-cooled counterpart, this unit is designed to be submerged in dielectric fluid, allowing for higher sustained power outputs and dynamic performance modes. It is the perfect solution for mining operations equipped with immersion tanks (single-phase liquid cooling) that seek to eliminate noise, dust, and thermal throttling while maximizing hashrate density.
Available in: 215 TH/s, 239 TH/s, 279 TH/s, 301 TH/s
Key Specifications
Feature | Specification |
Model | Antminer S21 Immersion |
Hashrate | 301 TH/s ± 3% (High Energy Mode) |
Power Consumption | 5,569 W ± 5% (HEM) |
Power Efficiency | ~16.0 J/TH (NEM) to ~18.5 J/TH (HEM) |
Algorithm | SHA-256 (Bitcoin) |
Cooling System | Immersion (Oil Cooled) |
Voltage | 380V ~ 415V (3-Phase) |
Dimensions | 293mm x 236mm x 364mm |
Net Weight | 17.15 kg |
Unmatched Performance
The Antminer S21 Immersion is designed with flexibility in mind, offering two distinct operating modes to adapt to market conditions. In High Energy Mode (HEM), the unit pushes performance limits to achieve an impressive 301 TH/s, significantly outperforming the standard air-cooled S21. In Normal Energy Mode (NEM), it operates at a highly efficient 239 TH/s, prioritizing energy savings. This adaptability allows miners to switch between maximum output and maximum efficiency based on current electricity prices and difficulty levels.
Advanced Immersion Cooling Technology
This model is purpose-built for liquid immersion, removing the physical limitations of fans and heatsinks found in traditional miners.
Dual-Mode Optimization: The immersion environment allows the hardware to safely handle higher power loads (up to 5,569W) without the risk of overheating, unlocking higher hashrates than air-cooled models.
Complete Environmental Protection: Submerging the unit in dielectric fluid isolates the hash boards from dust, humidity, and corrosive particles, ensuring near-zero maintenance and significantly extending hardware life.
Silent & Scalable: Without high-RPM fans, the S21 Immersion operates silently, making it ideal for deployments where noise pollution is a concern.
Efficiency & Industrial Design
The S21 Immersion offers a flexible efficiency range, delivering approximately 16.0 J/TH in its normal mode and 18.5 J/TH when pushed to maximum output. This "overclock-ready" design is housed in a compact chassis tailored for standard immersion tanks. It utilizes a 3-phase power input (380V-415V) to support its high power draw and features a handle-equipped form factor for easy insertion and removal from cooling fluids.
Conclusion
The Bitmain Antminer S21 Immersion is a versatile and robust choice for the modern mining farm. By combining the proven reliability of the S21 architecture with the thermal benefits of immersion cooling, it offers miners the unique ability to dynamically trade efficiency for raw power (up to 301 TH/s), ensuring profitability across varying market cycles.