How to Set Up Bitmain Antminer S21 Pro (234TH/s) Next-Gen SHA-256 Bitcoin Miner

Published September 05, 2025

How to Set Up Bitmain Antminer S21 Pro (234TH/s) Next-Gen SHA-256 Bitcoin Miner

The Bitmain Antminer S21 Pro is a next-generation SHA-256 ASIC miner offering a powerful 234TH/s hash rate with high energy efficiency. Designed for professional Bitcoin mining, it delivers stable performance while minimizing electricity costs.

This guide provides step-by-step instructions for unboxing, connecting, configuring, and optimizing your S21 Pro to start mining Bitcoin efficiently.

1. Required Equipment and Preparations

Before starting, ensure you have:

  • Bitmain Antminer S21 Pro unit

  • Compatible power supply unit (PSU) capable of handling ~3520W

  • Stable internet connection (Ethernet recommended)

  • Mining pool account (e.g., Antpool, F2Pool, ViaBTC)

  • Computer or mobile device for miner configuration

  • Proper ventilation and cooling setup to maintain safe operating temperature

  • Surge protector or UPS to prevent electrical damage

⚠️ Ensure your power circuit can handle the miner’s load to prevent PSU failure or fire hazards.

2. Unboxing and Inspection

  1. Carefully remove the miner from the box.

  2. Inspect the miner for physical damage, including fans, connectors, and casing.

  3. Keep the manual and accessories for reference.

  4. Place the miner on a stable, flat surface with good airflow.

3. Connecting the Power Supply

  1. Connect the PSU cables to the S21 Pro’s input ports.

  2. Ensure the PSU can handle 3520W, with proper voltage (220–240V recommended).

  3. Connect the PSU to a stable power source.

  4. Double-check grounding to avoid electrical hazards.

💡 Tip: Using a dedicated circuit for the miner reduces the risk of tripping breakers or power surges.

4. Network Connection

  1. Use an Ethernet cable to connect the miner to your router or network switch.

  2. Avoid Wi-Fi; Ethernet ensures stable mining performance.

  3. Make sure your router has DHCP enabled, so the miner can receive an IP address automatically.

5. Accessing the Miner’s Web Interface

  1. Locate the miner’s IP using your router’s admin panel or the Bitmain IP Reporter tool.

  2. Enter the IP address in a web browser.

  3. Log in with the default credentials:

    • Username: root

    • Password: root

  4. Navigate to the Miner Configuration page.

6. Mining Pool Configuration

  1. Under Pool Settings, enter your preferred mining pool URL(s).

    • Example for Antpool: stratum+tcp://btc.antpool.com:3333

  2. Input your Worker Name (usually walletaddress.workername).

  3. Add a password if required (often just x).

  4. Save and apply the settings.

The miner will begin hashing and submit shares to your pool.

7. Monitoring Performance

  1. On the Miner Status page, monitor:

    • Hashrate (should approach 234TH/s)

    • Temperature readings

    • Fan speeds and airflow

    • Accepted/rejected shares

  2. Adjust PSU, airflow, or firmware settings if necessary to maintain stability.

  3. Enable automatic restart in case of power or network failure.

8. Firmware Updates

  • Regularly check for Bitmain firmware updates.

  • Update firmware via the System tab in the web interface.

  • Firmware updates improve efficiency, stability, and security.

9. Safety and Maintenance

  • Keep the miner in a dust-free environment.

  • Ensure fans have unobstructed airflow.

  • Use a surge protector or UPS for power protection.

  • Check connections periodically to prevent overheating or electrical issues.

10. Troubleshooting

  • Miner not starting: Verify PSU wattage and connections.

  • Low hashrate: Check pool settings and network stability.

  • Overheating: Improve ventilation and clean dust from fans.

  • Network errors: Use IP Reporter to reconnect the miner to the network.

Conclusion

The Bitmain Antminer S21 Pro is designed for next-gen Bitcoin mining, delivering high hashrate with energy efficiency. Proper setup, cooling, and monitoring are essential to maximize performance and ensure long-term stability.

By following this guide, your S21 Pro will be ready to mine Bitcoin effectively and profitably while maintaining safe operation.