How to Set Up Bitmain Antminer S21 XP Hydro (473TH/s, 5670W) Liquid-Cooled Bitcoin Miner

Published September 05, 2025

How to Set Up Bitmain Antminer S21 XP Hydro (473TH/s, 5670W) Liquid-Cooled Bitcoin Miner

The Bitmain Antminer S21 XP Hydro is one of the most advanced ASIC miners available, delivering an incredible 473TH/s hash rate with 5670W power consumption. Unlike traditional air-cooled miners, the S21 XP Hydro uses a liquid cooling system to maintain stable operation, reduce heat, and extend hardware lifespan.

This guide will walk you through everything you need to know to unbox, connect, configure, and optimize your Antminer S21 XP Hydro for Bitcoin mining.

1. What You’ll Need Before Setup

Before starting, make sure you have the following:

  • Antminer S21 XP Hydro unit

  • BITMAIN Hydro Cooling System (WATERCOOL KIT) or compatible liquid cooling setup

  • 5670W+ power supply (P21 or equivalent PSU recommended by Bitmain)

  • Stable internet connection (Ethernet preferred for reliability)

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

  • Computer or mobile device for configuration

  • Coolant fluid recommended by Bitmain for the hydro system

  • Proper ventilation for PSU and safe installation space

⚠️ Important: This unit is not air-cooled. Running it without a liquid cooling system will permanently damage the miner.

2. Unboxing and Inspection

  1. Carefully unbox the miner and ensure all components are present.

  2. Inspect the cooling pipes, power connectors, and casing for any shipping damage.

  3. Verify that the PSU and hydro system kit are included if purchased together.

  4. Keep the miner upright and handle with care to avoid damaging the liquid connections.

3. Setting Up the Hydro Cooling System

The Antminer S21 XP Hydro requires a closed-loop water cooling system.

  1. Install the water cooling kit provided by Bitmain (or compatible third-party kit).

  2. Connect inlet and outlet pipes between the miner and the cooling system.

    • Inlet = Cool water into the miner

    • Outlet = Heated water out of the miner

  3. Fill the cooling system with the correct coolant fluid (do not use plain tap water).

  4. Ensure all fittings are tightly secured to prevent leaks.

  5. Turn on the cooling system and check that water flows properly before powering the miner.

💡 Tip: Place the cooling radiator in a well-ventilated area to allow heat dissipation.

4. Connecting Power Supply

The S21 XP Hydro requires 5670W at ~220-240V.

  1. Connect the power supply cables from the PSU to the miner’s input ports.

  2. Make sure the power source is stable and has the correct electrical capacity.

  3. Double-check grounding to prevent electrical hazards.

⚠️ Running this miner on insufficient power can damage both the unit and PSU.

5. Network Connection

  1. Plug an Ethernet cable from your router/switch into the miner’s network port.

  2. Avoid Wi-Fi connections, as stability is critical for mining.

  3. Ensure your router supports DHCP so the miner automatically receives an IP address.

6. Accessing the Miner’s Interface

  1. On your computer, open your router’s admin panel or use an IP scanner to locate the miner’s IP address.

  2. Enter the miner’s IP in your web browser.

  3. Log in using the default credentials:

    • Username: root

    • Password: root (or as specified in the manual)

  4. Once logged in, navigate to the Miner Configuration tab.

7. Mining Pool Configuration

  1. Enter your mining pool URL(s) under the Pool Settings section.

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

  2. Input your Worker Name (usually your wallet address or pool username).

    • Format: username.workername

  3. Enter your pool password (if required, often just “x”).

  4. Save and apply settings.

The miner will now connect to your selected pool and begin hashing.

8. Monitoring and Optimization

  1. Check the Miner Status page to view:

    • Hashrate performance (should be near 473TH/s)

    • Temperature readings (ensure coolant is stable)

    • Fan/pump speeds

    • Accepted/rejected shares

  2. Adjust cooling and power settings if needed to maintain stability.

  3. Enable automatic restart in case of connection loss.

  4. Update to the latest firmware via the System tab to ensure best performance and security.

9. Safety and Maintenance

  • Regularly check coolant levels and replace fluid as per Bitmain’s recommendations.

  • Inspect all tubing and fittings for leaks or blockages.

  • Keep the PSU in a dust-free environment with good airflow.

  • Avoid placing the miner in areas with high humidity or unstable power.

10. Troubleshooting

  • Miner not starting: Check PSU wattage and power connections.

  • High temperature alerts: Verify coolant flow and radiator ventilation.

  • Low hashrate: Re-check pool settings, internet stability, and firmware.

  • Network not detected: Reset IP using Bitmain’s IP Reporter tool.

Final Thoughts

The Bitmain Antminer S21 XP Hydro is designed for professional large-scale Bitcoin mining operations and requires careful setup of its hydro cooling system. By following this guide, you’ll ensure your miner runs efficiently at 473TH/s with proper stability and lifespan.

Once running, you can monitor performance remotely and join top mining pools for maximum profitability.