The Bitmain Antminer S21 Pro 234Th is a high-performance ASIC miner launched in July 2024, designed for mining SHA-256 algorithm-based cryptocurrencies. With a maximum hashrate of 234.00 TH/s and power consumption of 3,550 watts, this mining rig positions itself as a competitive option for serious crypto miners seeking efficiency and scalability.
This comprehensive analysis explores the device’s profitability, technical specifications, purchasing options, and frequently asked questions—helping you make an informed decision in your cryptocurrency mining journey.
Performance and Mining Efficiency
At the core of any mining operation lies the balance between hashrate, power draw, and profitability. The Antminer S21 Pro delivers an impressive 234 terahashes per second (TH/s), placing it among the more powerful models in Bitmain’s latest lineup.
Designed specifically for SHA-256 coins such as Bitcoin (BTC), Bitcoin Cash (BCH), and Peercoin (PPC), this miner offers flexibility across multiple blockchain networks. Its energy efficiency stands at approximately 15.17 joules per terahash (J/TH), reflecting Bitmain’s continued focus on optimizing power-to-performance ratios.
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Daily Profitability Breakdown
Mining profitability depends on several factors: current coin prices, network difficulty, electricity costs, and operational overheads. Assuming an electricity rate of $0.10 per kWh, here's how the S21 Pro performs across major SHA-256 coins:
Peercoin (PPC)
- Coin Price: $0.259733
- Daily Income: $14.25 (≈54.88 PPC)
- Power Cost: $8.52
- Net Daily Profit: $5.73
Peercoin currently offers the highest return for this miner due to favorable network conditions and lower competition compared to Bitcoin.
Bitcoin (BTC)
- Coin Price: $108,670.00
- Daily Income: $13.77 (≈0.000127 BTC)
- Power Cost: $8.52
- Net Daily Profit: $5.25
Despite Bitcoin’s dominance and higher market value, increased network difficulty reduces per-unit mining yields, making it slightly less profitable than Peercoin with this hardware.
Bitcoin Cash (BCH)
- Coin Price: $474.30
- Daily Income: $13.64 (≈0.028767 BCH)
- Power Cost: $8.52
- Net Daily Profit: $5.12
Bitcoin Cash remains a solid alternative, offering consistent returns with relatively stable mining difficulty.
Fractal Bitcoin (FB)
- Coin Price: $0.00 (unlisted)
- Daily Income: ~$0.00
- Net Daily Profit: –$8.52 (operational loss)
Due to lack of market value or exchange support, mining Fractal Bitcoin results in negative returns and is not recommended at this time.
With average earnings between $5.12 and $5.73 per day, the Antminer S21 Pro delivers moderate profitability under current market conditions.
Among all ASIC miners tracked by industry benchmarks, it ranks #27 in overall profitability, indicating mid-tier performance relative to newer or more efficient models.
Technical Specifications
Understanding the physical and operational parameters of your mining equipment is essential for deployment planning and long-term maintenance.
| Specification | Details |
|---|---|
| Manufacturer | Bitmain |
| Model | Antminer S21 Pro 234Th |
| Alternative Name | Antminer S21 Pro |
| Release Date | July 2024 |
| Hashrate (±10%) | 234.00 TH/s |
| Power Consumption (±10%) | 3,550 W |
| Energy Efficiency | ~15.17 J/TH |
| Dimensions (H×W×L) | 290 × 195 × 400 mm |
| Noise Level | 75 dB |
| Cooling Fans | 2 |
| Network Interface | Ethernet |
| Operating Temperature | 5°C to 40°C |
| Humidity Tolerance | 5% to 95% (non-condensing) |
This unit generates noticeable noise (75 dB), comparable to a loud vacuum cleaner, so placement in residential areas may require sound-dampening solutions.
Its compact size allows for dense rack configurations in data centers or dedicated mining farms, supporting scalability for institutional operators.
Where to Buy the Antminer S21 Pro
Pricing and availability vary significantly by region and vendor. Below are key sellers offering the device as of mid-2025:
- ApextoMining – China | In stock | $3,600.00
- X-ON MINING – China | In stock | $3,600.00
- MillionMiner – Germany | Pre-order / In stock options | Up to $4,999.00
- ASIC Market Place – Hong Kong | In stock | $4,099.00
- MaxiMiners – Czech Republic | In stock | $4,299.00
- BT-Miners – USA | Pre-order (Oct 2024) | $4,299.00
- Refined Capital – USA | In stock | $4,599.99
- Mining Delta – France | In stock | $6,647.38
Prices range from a low of $3,600** to over **$6,600, reflecting differences in shipping, import fees, and regional demand.
Based on a base cost of $3,600 and daily profits around $5.73, the estimated return on investment (ROI) is approximately 628 days (~1.7 years). Higher-priced units may take over 900 days to break even.
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Frequently Asked Questions (FAQ)
What is the daily profit of the Bitmain Antminer S21 Pro 234Th?
At an electricity cost of $0.10/kWh, the miner generates approximately **$5.73 per day** when mining Peercoin—the most profitable option currently available.
Which cryptocurrency is most profitable to mine with the S21 Pro?
As of now, Peercoin (PPC) offers the highest net return due to favorable price-to-difficulty ratios, yielding about $5.73 daily after power costs.
How long does it take to recover the investment?
With a purchase price starting at $3,600 and average daily profits of $5.73, the break-even point is roughly 628 days, or about 1 year and 9 months.
Is the Antminer S21 Pro suitable for home mining?
While technically feasible, its 75 dB noise level and continuous power draw make it better suited for industrial or well-insulated environments rather than residential use.
Can I mine Bitcoin efficiently with this device?
Yes, but profitability is reduced due to high network difficulty. You’ll earn about $5.25 net per day, which is slightly below Peercoin’s returns.
Does the S21 Pro support firmware customization?
Like most Bitmain ASICs, it supports third-party firmware such as Vnish or Braiins OS—though doing so may void warranty and affect stability.
Final Thoughts
The Bitmain Antminer S21 Pro 234Th is a capable mid-to-high-tier ASIC miner ideal for users targeting SHA-256 coins beyond just Bitcoin. While its profitability ranks outside the top 25 devices globally, strategic coin selection—like focusing on Peercoin—can enhance returns.
For miners looking to scale operations or diversify their portfolio in 2025, this model offers reliable performance with manageable energy consumption.
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