Antminer S21 – Hydro‑Cooling Bitcoin Miner
Antminer S21 provides efficient air‑cooled Bitcoin mining, combining high hashrate, reliability, and warranty coverage.
Antminer S21 Overview
The Antminer S21 is Bitmain’s latest air‑cooled Bitcoin miner. Unlike the hydro‑cooling XP+ Hyd, this model uses traditional airflow systems, making it easier to deploy in smaller setups. Consequently, miners benefit from lower infrastructure requirements while still achieving strong performance. Moreover, the S21 balances efficiency and affordability, positioning itself as a versatile choice for SHA‑256 mining.
Key Specifications

Hashrate: ~200 TH/s (varies by batch)
Power Consumption: ~3500 W
Power Efficiency: ~17.5 J/T
Algorithm/Coins: SHA‑256 | BTC, BCH, BSV
Cooling: Air‑cooled fans
Networking: RJ45 Ethernet 10/100M
Dimensions: Standard Antminer chassis size
Weight: ~15 kg

🛒 Purchasing Guidelines
The S21 typically costs $3,000–$4,000 per unit, depending on configuration and market demand. In addition, Bitmain accepts payments in USD, BTC, ETC, and USDT. Orders ship on a SPOT basis within 30–45 working days, ensuring timely deployment. However, buyers must prepare customs documentation because Bitmain does not allow cancellations or refunds after submission.

🚚 Shipping Details
Bitmain dispatches Antminer S21 units on a first‑paid, first‑shipped basis, rewarding early payment with priority delivery. Furthermore, customers handle customs clearance, while Bitmain provides Certificates of Conformity for compliance.

🛡 Warranty
Each S21 carries a 365‑day warranty. Bitmain covers replacement shipping costs during this period. Nevertheless, improper installation, unauthorized modifications, or resale void the warranty.

⚠️ Buyer Considerations

Air‑cooled design suits smaller farms or mixed setups.
Profitability depends not only on Bitcoin’s price but also on network difficulty and electricity rates.
ROI can fluctuate significantly because mining economics shift with market volatility.