The Bitmain Antminer S21 Pro has emerged as one of the most talked-about Bitcoin mining rigs in 2025, delivering a powerful 234 terahashes per second (Th/s) hashrate with improved energy efficiency. Designed for serious miners focused on SHA-256 algorithm profitability, this ASIC miner promises strong daily returns—if operated under optimal conditions. In this comprehensive review, we break down its real-world performance, profitability metrics, hardware specs, and long-term value to help you decide whether it's a smart investment.
Understanding the Bitmain Antminer S21 Pro
At the core of the Antminer S21 Pro is Bitmain’s latest-generation chip technology, engineered to maximize computational power while minimizing power draw. With a total hashrate of 234Th/s and a power consumption of 3,531 watts, the device achieves an impressive efficiency rate of 15.09 joules per terahash (J/Th)—a key factor in determining mining profitability.
This model is optimized for mining Bitcoin (BTC) and other SHA-256-based cryptocurrencies like Bitcoin Cash (BCH) and Bitcoin SV (BSV). Its air-cooling system ensures stable operation within standard temperature ranges (5–45°C), making it suitable for both home setups and industrial mining farms.
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Key Specifications
- Release Date: July 2024
- Hashrate: 234 Th/s
- Power Consumption: 3,531W
- Efficiency: 15.09 J/Th
- Noise Level: 75 dB
- Dimensions: 400 x 195 x 290 mm
- Weight: 18.5 kg
- Operating Temperature: 5°C to 45°C
These specs place the S21 Pro among the more efficient models in Bitmain’s current lineup, especially when compared to older generations such as the S19 series.
Mining Profitability Breakdown
Mining profitability depends on three primary factors: hashrate, electricity cost, and network difficulty. Based on current market conditions in 2025, here's a realistic estimate of what you can expect from the Antminer S21 Pro.
Daily, Monthly & Annual Earnings
| Metric | Value |
|---|---|
| Daily Income | $13.81 |
| Daily Electricity Cost | -$8.47 |
| Daily Profit | $5.34 |
| Monthly Profit | $160.19 |
| Annual Profit | $1,948.92 |
Assuming an average electricity rate of $0.163 per kWh, the S21 Pro generates approximately 0.00004913 BTC per day. While this may seem small, consistent operation over time can yield substantial returns—especially if Bitcoin’s price appreciates.
Best Coin to Mine
Although capable of mining multiple SHA-256 coins, Bitcoin (BTC) remains the most profitable option due to its dominant network hash rate and market value.
| Coin | Net Hashrate | Price (USD) | 24h Revenue |
|---|---|---|---|
| BTC | 843.4 Eh/s | $108,675 | $13.81 |
| BCH | 3.656 Eh/s | $476.54 | $13.33 |
Even though BCH offers slightly lower revenue, it could be a viable alternative during periods of high BTC network congestion or volatility.
Return on Investment (ROI) Analysis
One of the most critical considerations before purchasing any mining hardware is the payback period—how long it takes for your profits to cover the initial investment.
The Antminer S21 Pro is priced between $2,999 and $6,647, depending on the supplier and whether a power supply unit (PSU) is included. At the lowest price point and current profitability levels, the best-case payback time is approximately:
18.7 months (562 days)
However, higher-priced units from premium suppliers may take up to 41.5 months to break even—making vendor selection crucial.
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Factors That Impact ROI
- Electricity Costs: Lower rates significantly improve profit margins.
- Bitcoin Price Volatility: A rising BTC price increases revenue without affecting costs.
- Network Difficulty: As more miners join the network, competition increases, reducing individual rewards.
- Hardware Lifespan: Most ASICs last 3–5 years under proper maintenance.
Where to Buy the Antminer S21 Pro
Several authorized and third-party suppliers offer the S21 Pro globally. Here are some notable options:
- Cybminer: $2,999 (best price, no PSU mentioned)
- Yesmining: $3,744 (includes PSU, 23.4-month payback)
- Jingle Mining: $4,150 (includes PSU)
- Altair Technology: $5,899 (premium pricing)
- Mining Delta: $6,647 (highest listed price)
Always verify shipping availability, warranty terms, and PSU inclusion before purchasing.
Repair & Maintenance Services
Given the complexity of ASIC miners, having access to reliable repair services is essential for minimizing downtime.
Recommended providers include:
- D-Central – Supports Bitmain, MicroBT, Canaan, and more
- Manifold Services – Offers fast turnaround for major brands
- SustainHash Repair & Service Ltd. – Specializes in Bitmain and MicroBT units
- ARCT Electronique – Full-model support with weekday availability
Most services operate globally with UTC-aligned business hours and provide diagnostics, chip replacement, and firmware updates.
Frequently Asked Questions (FAQ)
How much does the Bitmain Antminer S21 Pro cost?
Prices range from $2,999 to $6,647, depending on the retailer and whether a power supply is included. The most competitive deals are typically found through direct distributors like Cybminer or Yesmining.
What is the expected lifespan of the S21 Pro?
With proper cooling and maintenance, the S21 Pro can last 3 to 5 years. Regular cleaning and stable power input help extend its operational life.
Can I mine coins other than Bitcoin with this miner?
Yes. The S21 Pro supports any cryptocurrency using the SHA-256 algorithm, including Bitcoin Cash (BCH), Bitcoin SV (BSV), and others. However, BTC remains the most profitable due to its market dominance.
Does the miner come with a power supply?
Some vendors include a PSU; others sell it separately. Always check product details before ordering. If not included, you’ll need a compatible power supply rated for at least 3,531W.
How noisy is the Antminer S21 Pro?
It operates at 75 dB, which is comparable to a loud vacuum cleaner. For residential use, consider placing it in a dedicated room or using sound-dampening enclosures.
Is cloud mining more profitable than buying an S21 Pro?
While cloud mining avoids upfront hardware costs and noise issues, it often delivers lower long-term returns due to service fees and lack of asset ownership. Owning a physical miner like the S21 Pro gives you full control and potential resale value.
👉 Learn how owning your mining hardware can lead to better long-term gains.
Final Verdict: Is the Antminer S21 Pro Worth It?
The Bitmain Antminer S21 Pro stands out as a high-performance ASIC miner ideal for those entering or scaling up in Bitcoin mining. With a solid hashrate of 234Th/s, excellent efficiency (15.09 J/Th), and reasonable power draw, it delivers strong profitability under favorable conditions.
Its main appeal lies in its balance between performance and cost—especially when purchased at competitive prices below $3,000. However, success hinges on securing low electricity rates and maintaining stable operations over time.
For serious miners looking to build a scalable, future-ready setup, the S21 Pro is a compelling choice in 2025.
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