Bitmain Antminer S21+ : The Detailed Review
Miners
- tagwu
SUMMARY
Bitmain Antminer S21+, with its impressive 216Th/s hashrate and high energy efficiency (16.50 J/Th), stands out as one of the top mining machines in 2024. Given the rising mining difficulty and fluctuating BTC prices, miners need to assess not only current profitability but also the long-term viability of their equipment.
This article explores the profitability, future outlook, and key considerations
Table of Contents
Technical Specifications
| Manufacturer | Bitmain |
|---|---|
| Model | Antminer S21+ (216Th) |
| Release | Feb 2025 |
| Size | 400 x 195 x 290mm |
| Noise level | 75db |
| Fan(s) | 2 |
| Power | 3564W |
| Interface | Ethernet |
| Temperature | 10 – 40 °C |
| Humidity | 10 – 90 % |
Comparing Bitmain Antminer S21+ with Other Top BTC Miners
$0.04/kWh.
| Model | Hashrate (Th/s) | Power Consumption (W) | Efficiency (J/Th) | Estimated Daily Profit ($) | Expected Release |
|---|---|---|---|---|---|
| Antminer S21 Pro | 234 | 3531 | 15.09 | $9.42 | Jul 2024 |
| Avalon A1566I | 249 | 4500 | 18.07 | $9.31 | Jul 2024 |
| WhatsMiner M60S+ | 212 | 3600 | 16.98 | $8.15 | Aug 2024 |
| Antminer S21+ | 216 | 3564 | 16.50 | $8.40 | Feb 2025 |
| Antminer S21 | 200 | 3550 | 17.75 | $7.59 | Feb 2024 |
Analysis:
Hashrate Comparison:
Avalon A1566I has the highest hashrate at 249 Th/s, slightly more than S21 Pro (234 Th/s).
WhatsMiner M60S+ and S21+ are slightly below 220 Th/s.
Antminer S21 has the lowest hashrate at 200 Th/s.
Power Consumption:
S21 Pro has the lowest power consumption (3531W), making it the most energy-efficient.
Avalon A1566I consumes the most power at 4500W, which might lead to higher operational costs.
The other models range between 3564W and 3600W.
Energy Efficiency (J/Th):
S21 Pro is the most efficient at 15.09 J/Th, making it ideal for lower electricity costs.
Avalon A1566I is the least efficient at 18.07 J/Th, which may affect profitability in regions with higher electricity costs.
The other models have energy efficiency between 16 and 17.5 J/Th.
Daily Profitability:
S21 Pro has the highest daily profit at $9.42, followed by Avalon A1566I at $9.31.
S21+ and WhatsMiner M60S+ have similar earnings ($8.15–$8.40/day).
S21 (200Th) has the lowest daily earnings at $7.59.
Conclusion:
Bitmain Antminer S21 Pro is the best overall choice due to high hashrate, low power consumption, excellent efficiency, and the highest daily profit.
Canaan Avalon A1566I has the highest hashrate (249 Th/s), but also the highest power consumption (4500W), making it more suitable for those who prioritize raw hashrate over efficiency.
WhatsMiner M60S+ and Antminer S21+ are balanced choices, offering mid-range efficiency and profitability.
Antminer S21 (200Th)
BTC Coin Prices History
1. All-Time High (ATH)
The highest recorded price for Bitcoin was $108,786, reached on January 20, 2025.
Currently, Bitcoin’s price is 9.85% lower than this peak, reflecting typical market volatility and potential profit-taking by investors.
2. All-Time Low (ATL)
The lowest price ever recorded for Bitcoin was $67.81, occurring on July 6, 2013.
Since then, Bitcoin has surged by an astonishing 144,529.45%, demonstrating its long-term growth and adoption as a digital asset.
3. Market Capitalization & Ranking
The current market capitalization of Bitcoin stands at $1.94 trillion, securing its position as the #1 ranked cryptocurrency globally.
Market capitalization is calculated by multiplying the current price of Bitcoin by the circulating supply of 20 million BTC.
4. 24-Hour Trading Volume
Over the last 24 hours, Bitcoin’s trading volume reached $32.29 billion, reflecting its strong liquidity and active participation in the market.
However, this volume marks a -11.70% decrease compared to the previous day, signaling a temporary decline in market activity.
5. Fully Diluted Valuation (FDV)
The fully diluted valuation (FDV) of Bitcoin is also $1.94 trillion, assuming all 21 million BTC are in circulation.
As Bitcoin follows a strict emission schedule, the full circulation supply will take years to be mined, meaning FDV is a long-term projection of its total market worth.
6. Price Performance Against the Market
Over the past 7 days, Bitcoin’s price has declined by -0.30%, underperforming the global cryptocurrency market, which has increased by +1.40%.
Bitmain Antminer S21+ Profitability
Bitmain Antminer S21+ (216Th/s) currently generates approximately $11.66 per day in total mining revenue at a Bitcoin price of $98,015.22. After accounting for electricity costs at $0.04/kWh, the estimated daily net profit is $8.24.
On a monthly basis, the miner can bring in around $247.20 in net profit, while the yearly net profit is estimated at $3,011.60. Given the approximate machine cost of $4,500, the ROI period is expected to be around 18 months (1.5 years) under current market conditions.
With high energy efficiency (16.50 J/Th) and competitive profitability, the S21+ remains a strong choice
Future Perspective of Bitmain Antminer S21+
Bitmain Antminer S21+ is positioned as one of the most efficient Bitcoin miners in 2024, but its long-term profitability will depend on several key factors.
1. Bitcoin Price Trends
As the BTC price remains volatile, higher valuations can significantly enhance mining profitability. If BTC continues its bullish trend and surpasses $100,000, the S21+ could become even more lucrative, reducing the ROI period further.
2. Mining Difficulty Adjustments
With increasing network hashrate, mining difficulty will rise over time, affecting BTC rewards per miner. The S21+ maintains a competitive edge with its high efficiency (16.50 J/Th), making it more resilient against difficulty spikes compared to older models.
3. Energy Efficiency and Cost Control
Energy-efficient miners will dominate the market as electricity costs become a crucial factor in profitability. The S21+ is one of the most efficient SHA-256 ASICs, ensuring a better return for miners with cheap electricity sources. Those with higher electricity costs may see margins shrink unless BTC prices rise accordingly.
4. Competition with Next-Gen Miners
While the S21+ is cutting-edge now, manufacturers like Bitmain, MicroBT, and Canaan are continually improving ASIC designs. Future miners with lower power consumption and higher hashrates could impact the S21+’s relevance, especially if released within the next 1-2 years.
5. Post-Halving Impact
The Bitcoin halving in 2028 will reduce block rewards from 3.125 BTC to 1.5625 BTC, directly affecting mining profitability. Miners with higher efficiency will be the most sustainable in a lower-reward environment, making models like the S21+ viable until the next hardware breakthrough
CONCLUSION
Bitmain Antminer S21+ has a strong market position for the next 1-2 years, offering solid profitability and a reasonable ROI period. However, miners should stay prepared for network difficulty increases, halving events, and new hardware advancements. Strategic electricity cost management and reinvestment in newer ASICs
FAQs on Bitmain Antminer S21+
Is the Bitmain Antminer S21+ still a profitable mining machine?
Yes, the Bitmain Antminer S21+ remains profitable, especially for miners with low electricity costs. At an electricity rate of $0.04/kWh, the estimated daily net profit is around $8.24, with an annual profit exceeding $3,000. However, profitability depends on Bitcoin’s price, mining difficulty, and energy costs.
How does the S21+ compare to other Bitcoin miners?
S21+ is one of the most efficient Bitcoin miners on the market, offering higher profitability than older models like the S19 series. It competes closely with MicroBT WhatsMiner M60S+ and Canaan Avalon A1566I, but its lower energy consumption per terahash
What factors could affect the profitability of the S21+ in the future?
Bitcoin Price Movements – A price increase boosts profitability, while a decline reduces earnings.
Mining Difficulty – As more miners join the network, rewards per miner decrease.
Electricity Costs – Higher electricity prices can significantly cut profits.
Next-Gen ASIC Miners
