Bitmain Antminer S21+ 225Th – Next-Gen Bitcoin Miner

The Bitmain Antminer S21+ 225Th is a high-efficiency SHA-256 ASIC miner built for serious Bitcoin (BTC) and Bitcoin Cash (BCH) operations. Delivering up to 225 TH/s of hashrate, it’s designed for miners who want strong performance, excellent energy efficiency and long-term stability in a compact, rackable form factor.

As an upgrade in the S21 family, the S21+ 225Th combines improved chip design with optimized airflow and firmware tuning. The result is a miner that offers a powerful balance of hashrate and power draw, making it suitable for both dedicated home mining rooms and professional farms with reliable ventilation and power infrastructure.

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What the Bitmain Antminer S21+ mines

• Algorithm: SHA-256

• Primary coins:

  • Bitcoin (BTC)

  • Bitcoin Cash (BCH)

• Other supported SHA-256 coins:

  • Various SHA-256–based altcoins, depending on your mining pool

Configured with the right pool, you can flexibly point the S21+ to different SHA-256 coins, although most miners will target BTC as the primary revenue source.

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Key features

• 225 TH/s SHA-256 hashrate
  Up to 225 terahash per second of SHA-256 mining performance from a single unit, giving you serious hashpower in a compact footprint.

• High efficiency with ~3.6 kW power draw
  The S21+ 225Th typically draws around 3.6 kW at the wall, offering energy efficiency in the region of around 16 J/TH. This balance between hashrate and power makes it attractive for miners with competitive electricity rates.

• Optimised air cooling
  A dual-fan, high-pressure air-cooling design keeps the miner stable under 24/7 load. The chassis and heatsinks are designed to move hot air through efficiently, helping protect your investment over time.

• Industrial noise level
  At roughly 75 dB, the Antminer S21+ is designed for garages, warehouses, containers or dedicated mining rooms rather than typical living spaces. It’s ideal where you can manage noise and airflow.

• Ready for 24/7 uptime
  Built for continuous operation, the S21+ is designed to run around the clock with appropriate power, cooling and dust management. Once configured, it can be largely hands-off with basic monitoring.

• Simple network setup
  Standard Ethernet network interface for quick setup: connect to your router or switch, access the web dashboard, set your pool and wallet details, and start mining.

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Technical specifications

You can drop this directly into a spec table on your product page.

• Manufacturer: Bitmain

• Model: Antminer S21+ 225Th

• Algorithm: SHA-256

• Supported coins: Bitcoin (BTC), Bitcoin Cash (BCH) and other SHA-256–based coins (pool dependent)

• Hashrate: 225 TH/s (terahash per second), typical ±5–10% variance

• Power consumption: Approximately 3 550–3 700 W (around 3.6 kW at the wall, depending on environment and settings)

• Energy efficiency: Around 16 J/TH (joules per terahash), depending on exact power draw

• Cooling: Air cooling, dual high-speed fans

• Noise level: Around 75 dB (industrial / mining-room level)

• Network interface: RJ45 Ethernet

• Input voltage: 200–240V AC, 50/60 Hz (suitable for mining-grade power infrastructure)

• Operating temperature: Approximately 5 – 45 °C

• Operating humidity: Approximately 10 – 90% RH, non-condensing

• Dimensions: About 219 × 293 × 450 mm (W × H × D, orientation may vary by listing)

• Weight: Around 20 kg (net, without packaging)

What’s in the box

(Adjust this to match your actual bundle.)

• Bitmain Antminer S21+ 225Th miner

• Integrated power supply (if included by supplier)

• Power cable (region-specific)

• Basic setup / quick-start instructions