The Antminer S21 Pro is Bitmain’s answer to the demand for higher density in traditional air-cooled environments. By utilizing refined 5nm chip binning, the S21 Pro achieves a 17% efficiency gain over the previous S19 series, making it one of the most sustainable assets for the post-2024 halving landscape.
Unmatched 15 J/TH Air-Cooled Efficiency
Efficiency is the single most important metric for long-term mining success. The S21 Pro delivers a market-leading 15 J/TH, allowing you to generate more Bitcoin per kilowatt-hour than almost any other air-cooled rig.
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Higher Profitability: Lower operational overhead (OPEX) directly translates to faster ROI.
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Next-Gen Power Management: The integrated high-efficiency PSU is designed to handle voltage fluctuations while maintaining a steady 3510W output.
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Stable Hashrate: Precision-engineered hash boards ensure the 234T output remains consistent even during 24/7 peak operation.
Enhanced Thermal & Acoustic Engineering
The S21 Pro features a refined chassis designed for better airflow and lower maintenance:
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Advanced Cooling: Four high-speed fans (76 dB) work in tandem with high-density heatsinks to prevent thermal throttling, even in ambient temperatures up to 45°C.
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Improved Durability: Bitmain has reinforced the internal components to resist dust accumulation and humidity, extending the operational life of the unit to 5+ years.
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Versatile Connectivity: Equipped with a standard RJ45 Ethernet port for easy integration into existing mining management software and pools.
Technical Specifications Overview
| Feature | Specification |
| Manufacturer | Bitmain |
| Model | Antminer S21 Pro (234 TH/s) |
| Algorithm | SHA-256 (BTC, BCH, BSV) |
| Hashrate | |
| Power Consumption | |
| Power Efficiency | |
| Cooling Method | Air-cooled (4 Fans) |
| Input Voltage | 220V – 277V |
| Noise Level | |
| Dimensions | |
| Net Weight |
Why Purchase the S21 Pro from CryptoMiners24?
When investing in professional-grade hardware, reliability is paramount. CryptoMiners24 offers:
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Authentic 2025 Inventory: 100% brand-new Bitmain units with a full 365-day manufacturer warranty.
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Secure Global Shipping: Fully insured express delivery to the USA, Europe, and the Middle East via DHL/FedEx.
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Crypto-Centric Payments: We accept USDT (TRC20), Bitcoin (BTC), and traditional Bank Wire.
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Hosting Solutions: Ask us about our secure data center hosting if you prefer a “hands-off” mining experience.
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Upgrade to the 270T S21 XP for world-record 13.5 J/TH efficiency.
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Check out the S21 XP Hydro for maximum 500T liquid-cooled density.
Pro Tip: The Antminer S21 Pro requires a stable 220V-277V power source and a high-quality C19 power cable. For best results, maintain an operating environment between and to ensure the 15 J/TH efficiency remains at its peak.
