The Bitmain Antminer S21 is a cutting-edge Bitcoin mining rig engineered for high performance and energy efficiency. With a robust 200 TH/s hashrate and power consumption of just 3,500W, this ASIC miner stands at the forefront of modern cryptocurrency mining technology. Designed for both individual miners and large-scale operations, the S21 delivers exceptional computational power while maintaining operational sustainability in diverse environments.
Whether you're upgrading from older hardware or entering the mining space, the Antminer S21 offers a compelling balance of speed, efficiency, and reliability—backed by Bitmain’s industry-leading 365-day factory warranty.
Key Performance Metrics
- Hashrate: 200.00 TH/s
- Power Consumption: 3,500W (wall power)
- Energy Efficiency: 17.5 J/TH
- Daily Profitability: ~$3.21 (varies with BTC price and electricity cost)
- Estimated ROI: ~27.9 months
These figures are based on typical operating conditions at 25°C inlet air temperature. Actual performance may vary within ±3% for hashrate and ±5% for power due to environmental and electrical factors.
👉 Discover how the Antminer S21 can boost your mining returns today.
Technical Specifications
Product Overview
| Feature | Specification |
|---|---|
| Model | S21 |
| Algorithm | SHA-256 |
| Supported Cryptocurrencies | Bitcoin (BTC), Bitcoin Cash (BCH), Bitcoin SV (BSV) |
| Hashrate | 200 TH/s (typical) |
| Power Input | 3,500W @ wall |
| Efficiency | 17.5 J/TH |
Power Requirements
- Input Voltage: 220–277V AC
- Frequency Range: 50–60 Hz
- Max Current: 20A
- Phase: Single-phase
⚠️ Note: Using incorrect voltage can damage the unit. Ensure compatibility with your local power grid before operation.
Physical & Environmental Specifications
- Dimensions (without packaging): 400 × 195 × 290 mm
- Weight (net): 15.4 kg
- Gross Weight (with packaging): 17.2 kg
- Noise Level: 76 dBA at 30°C (maximum fan speed)
- Operating Temperature: 0°C to 45°C
- Storage Temperature: -20°C to 70°C
- Humidity (non-condensing): 10%–90% RH
- Maximum Operating Altitude: ≤2,000 meters
For installations above 900 meters, reduce maximum operating temperature by 1°C per additional 300 meters to prevent thermal throttling.
Advanced Cooling and Durability
Equipped with dual high-speed fans, the Antminer S21 ensures rapid heat dissipation under continuous load. This thermal management system helps maintain stable performance even during prolonged mining sessions. To maximize lifespan and efficiency:
- Place the miner in a well-ventilated, cool area.
- Avoid dusty or humid environments.
- Regularly clean air filters to prevent clogging.
Proper environmental control not only improves hashrate consistency but also reduces wear on internal components.
Bitmain’s Leadership in Mining Hardware
Since its founding in 2013, Bitmain has emerged as a global leader in ASIC-based cryptocurrency mining solutions. With offices across China, Singapore, Kazakhstan, and the United States, Bitmain serves over 100 countries and continues to innovate through its flagship Antminer series.
The Antminer S21 leverages advanced 5nm chip technology, representing a significant leap from earlier models like the S9 and S19. Compared to its predecessors:
- Up to 30% higher hashrate density
- Over 25% improvement in energy efficiency
- Enhanced durability through precision-engineered hash boards
This evolution reflects Bitmain’s ongoing commitment to reducing power costs per terahash while increasing network security contributions.
Comparison with Previous Antminer Models
Bitcoin mining has evolved rapidly—from the early days of CPU mining to today’s ultra-efficient ASIC rigs. The Antminer S21 represents the current pinnacle of that progression.
| Model | Hashrate | Power | Efficiency (J/TH) |
|---|---|---|---|
| Antminer S9 | 14 TH/s | 1,375W | ~98 J/TH |
| Antminer S19 Pro | 110 TH/s | 3,250W | ~29.5 J/TH |
| Antminer S21 | 200 TH/s | 3,500W | 17.5 J/TH |
The S21 outperforms previous generations with nearly double the hashrate of the S19 Pro while consuming only slightly more power—resulting in unmatched efficiency for SHA-256 mining.
👉 See how next-gen mining hardware compares in real-world profitability.
Mining Profitability and Return on Investment
Mining profitability depends on several variables:
- Bitcoin market price
- Network difficulty
- Electricity cost per kWh
- Pool fees
- Hardware efficiency
At current estimates:
- With an average electricity cost of $0.08/kWh, daily profit is approximately **$3.21**
- This results in a payback period of around 27.9 months
- Higher electricity rates will extend ROI time significantly
Using an energy-efficient miner like the S21 becomes crucial in high-cost regions, where operational expenses can quickly erode margins.
Minable Coins & Pools
The S21 supports all SHA-256 based blockchains:
- Bitcoin (BTC)
- Bitcoin Cash (BCH)
- Bitcoin SV (BSV)
Popular mining pools include:
- F2Pool
- Poolin
- Slush Pool
- BTC.com
Joining a reliable pool increases reward consistency and reduces variance.
Frequently Asked Questions (FAQs)
What is the expected lifespan of the Antminer S21?
With proper maintenance and optimal operating conditions—such as stable temperatures, low dust exposure, and clean power supply—the Antminer S21 can last between 3 to 5 years. Regular cleaning and firmware updates further enhance longevity.
How does electricity cost affect mining profitability?
Electricity is the largest ongoing expense in mining. At $0.10/kWh, the S21 remains profitable under normal market conditions. However, costs above $0.15/kWh may drastically reduce or eliminate profits unless offset by higher Bitcoin prices.
Does the Antminer S21 come with a warranty?
Yes. All new units include a 365-day factory warranty from Bitmain, covering defects in materials and workmanship under normal use.
Can I use the S21 for mining other cryptocurrencies?
Yes—the S21 mines any cryptocurrency that uses the SHA-256 algorithm, including BTC, BCH, and BSV. However, Bitcoin remains the most profitable due to its market dominance and network incentives.
Is the miner ready to ship immediately?
In-stock units ship within 3–7 business days from Shenzhen or Hong Kong warehouses via DHL or UPS. Delivery takes approximately 5–10 business days internationally.
What payment methods are accepted?
Accepted payments include:
- Credit/debit cards
- Wire transfer
- ACH transfer
- Cryptocurrency
All transactions are processed securely, and prices are quoted in USD.
👉 Start mining smarter with one of the most efficient ASICs on the market.