Antminer S21+ – 235 TH/s

Antminer S21 – 235 TH/s: High-Efficiency SHA-256 ASIC Miner for Bitcoin Mining

The Antminer S21 is a next-generation ASIC miner designed for the SHA-256 algorithm, delivering a strong 235 TH/s hashrate for mining Bitcoin (BTC) and other SHA-256-based cryptocurrencies. With 16.50 J/TH efficiency and 3877W power consumption, it hits a practical sweet spot between performance and operating cost. It’s built for miners who want modern efficiency without extreme infrastructure demands, suitable for both professional farms and serious individual setups.

Historical and Projected Profitability

• Average daily profitability: ~$7.97/day at $0.04/kWh

• ROI depends on Bitcoin price, network difficulty, and electricity cost

• Designed for stable, long-term mining rather than short-term speculation

Technical Specifications

• Vendor: Antminer

• Brand: Bitmain

• Model: S21

• Hash Rate: 235 TH/s

• Algorithm: SHA-256

• Supported Coins: Bitcoin (BTC)

• Power Consumption: 3877 W

• Energy Efficiency: 16.50 J/TH

• Cooling System: Air-cooling (2 fans)

• Dimensions: 400 × 195 × 290 mm

• Noise Level: 75 dB

• Operating Temperature: 10°C to 40°C

• Network Interface: Ethernet

• Release Date: June 2025

Profitability and ROI Insights
Use the Profitability Calculator to estimate earnings based on current Bitcoin price, $0.04/kWh hosting rates, and network difficulty. Results vary, but the S21 is positioned as a consistent performer rather than a high-risk bet.

Flexible Deployment Options: Shipping or Hosting

• Shipping:

  • Worldwide delivery via DHL, UPS, FedEx, or TNT in 5–7 days

  • Secure packaging with tracking

  • Local duties and taxes may apply

• Hosting:

  • Available in USA, Dubai, Norway, Finland, Ethiopia, or Nigeria

  • Electricity from $0.04/kWh

  • Fully managed, hands-off operation with 24/7 maintenance

Estimated ROI by Location

• USA ($0.065/kWh): ~16.7 months

• Nigeria ($0.047/kWh): ~14.4 months

• Ethiopia ($0.054/kWh): ~15.3 months

• Dubai ($0.059/kWh): ~15.6 months

• Finland ($0.069/kWh): ~17.2 months

• Norway ($0.064/kWh): ~18.1 months

Hosting Benefits

• 7-year full warranty

• 95%+ uptime

• Deployment in 1–7 days

• FIAT & crypto exchange services

• 0% mining fee – keep 100% of mined coins
  Hosting removes infrastructure headaches and maximizes efficiency through low-cost power.

Key Features and Benefits

• High Hashrate & Efficiency: 235 TH/s at 16.50 J/TH for reduced power cost per TH

• Advanced Chip Technology: Optimized for stable, long-term SHA-256 mining

• Compact & Practical Design: Easy integration into existing farms

• Secure Operation: Built-in protections against operational and network risks

• Easy Monitoring: Real-time performance tracking and configuration

• Stable Connectivity: Ethernet-based remote management

Why Choose the Antminer S21?
The Antminer S21 is built for miners who value efficiency, stability, and predictability. It avoids extreme power draw while still delivering competitive hash power, making it ideal for long-term Bitcoin mining strategies especially when paired with $0.04/kWh hosting.

Warranty, Shipping, and Support

• Warranty: 7 years for hosted units, 12 months for shipped units (void if misused)

• Shipping: 5–7 days worldwide with tracking

• Payments: Cryptocurrency or wire transfer accepted

• Support: 24/7 assistance for setup, hosting, and troubleshooting