The Bitmain Antminer S21 Pro (234Th) stands as one of the most advanced ASIC miners in 2025, engineered for maximum efficiency in Bitcoin mining. With a powerful hashrate, competitive energy consumption, and broad availability across global vendors, it has quickly become a top choice for both individual miners and large-scale mining operations.
This comprehensive guide explores the performance, profitability, pricing, and key specifications of the Antminer S21 Pro — offering valuable insights for anyone considering an investment in high-efficiency SHA-256 mining hardware.
Key Specifications
The Antminer S21 Pro is built to dominate the current Bitcoin mining landscape with cutting-edge performance metrics:
- Manufacturer: Bitmain
- Model: Antminer S21 Pro (234Th)
- Release Date: July 2024
- Algorithm: SHA-256
- Hashrate: 234 TH/s ±5%
- Power Consumption: 3,510W ±5%
- Energy Efficiency: 15 J/TH
- Dimensions: 400 x 195 x 290 mm
- Noise Level: 75 dB
- Cooling: Dual fans
- Operating Temperature: 5°C to 45°C
- Humidity Tolerance: 5% to 95% (non-condensing)
- Network Interface: Ethernet
These specs position the S21 Pro as a leader in energy-efficient Bitcoin mining, especially when compared to older models like the S19 series.
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Performance and Energy Efficiency
At its core, the Antminer S21 Pro delivers a remarkable balance between raw power and energy economy. The 234 TH/s output enables consistent block-solving capability on the Bitcoin network, while the 15 joules per terahash (J/TH) efficiency sets a new benchmark for modern ASICs.
This level of efficiency directly impacts operational costs — particularly electricity — which is the largest expense in mining. For context, earlier models such as the Antminer S19j Pro (104 TH/s at ~29.5 J/TH) consume significantly more energy per unit of hashrate, making them less profitable under rising power costs.
With the S21 Pro, miners can scale operations sustainably, reducing heat output and cooling demands — crucial advantages for data centers or home setups with limited ventilation.
Mining Profitability Analysis
Profitability depends on three main variables: hashrate, power cost, and Bitcoin price. Let’s break down what you can expect from the Antminer S21 Pro under various electricity rates.
Assuming:
- Current BTC price: $60,000
- Network difficulty: Stable
- Pool fees: 1%
| Electricity Cost (per kWh) | Daily Revenue | Daily Power Cost | Net Daily Profit |
|---|---|---|---|
| $0.06 | $18.70 | $5.05 | $13.65 |
| $0.08 | $18.70 | $6.73 | $11.97 |
| $0.10 | $18.70 | $8.41 | $10.29 |
| $0.12 | $18.70 | $10.10 | $8.60 |
Note: Revenue may vary based on market fluctuations.
At $0.06/kWh**, the S21 Pro generates approximately **$415 monthly net profit, translating to a potential return on investment (ROI) within 9–12 months, depending on purchase price and network conditions.
💡 Tip: Hosting your miner in low-cost energy regions or using renewable sources can extend long-term profitability.
Where to Buy the Antminer S21 Pro – Global Pricing Overview
The Antminer S21 Pro is available through multiple trusted vendors worldwide. Below is a curated list of current offers (as of 2025), focusing on new units in stock and transparent pricing:
- Apexto Mining – Hong Kong | $3,600
- YesMining – Hong Kong | $3,600
- BT-Miners – United States | $1,534 (Limited-time offer)
- UMiners – Hong Kong | $3,697
- Refined Capital – USA | $5,225 (Includes local support & warranty)
- Miners.de – Germany | €4,100 (~$4,450)
- MineShop – Ireland | €4,700 (~$5,100)
- MillionMiner – Germany | €7,650 (~$8,300) (Premium service bundle)
While BT-Miners offers a surprisingly low price, buyers should verify shipping logistics, import taxes, and after-sales support before purchasing internationally.
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Frequently Asked Questions (FAQ)
Q: Is the Bitmain Antminer S21 Pro worth buying in 2025?
Yes. Given its superior energy efficiency (15 J/TH) and strong hashrate, the S21 Pro remains highly competitive in today's mining environment. As long as electricity costs stay below $0.12/kWh, it offers solid ROI potential.
Q: Can I use the S21 Pro for mining coins other than Bitcoin?
Technically, yes — any SHA-256-based cryptocurrency like Bitcoin Cash (BCH) or Bitcoin SV (BSV) can be mined with this device. However, Bitcoin remains the most profitable due to higher network value and liquidity.
Q: What is the expected lifespan of the Antminer S21 Pro?
Under optimal conditions (proper cooling, stable power supply), ASIC miners typically last 3–5 years. Regular maintenance and firmware updates from Bitmain help extend longevity.
Q: How noisy is the S21 Pro?
It operates at around 75 dB, similar to a loud vacuum cleaner. For home setups, consider placing it in a dedicated room or using sound-dampening enclosures.
Q: Do I need additional equipment to run the S21 Pro?
Yes. You’ll need:
- A compatible power supply unit (PSU)
- Stable internet connection
- Mining pool account
- Secure mounting space with adequate airflow
Some vendors offer bundle deals including PSUs and setup guides.
Q: How does the S21 Pro compare to the S21 Hyd?
The S21 Hyd is a liquid-cooled version designed for data centers, offering slightly better thermal management and noise reduction. The standard S21 Pro is air-cooled and better suited for general deployment.
Final Thoughts
The Bitmain Antminer S21 Pro (234Th) represents a significant leap forward in Bitcoin mining technology. Its combination of high hashrate, low energy consumption, and widespread availability makes it a smart choice for miners aiming to maximize efficiency and profitability in 2025.
Whether you're upgrading from older hardware or launching a new mining venture, this ASIC delivers reliable performance that aligns well with current market dynamics.
For those ready to take the next step, evaluating vendor reputation, total cost of ownership, and regional energy rates will ensure long-term success.
👉 Start calculating your potential mining profits today
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