The Bitmain Antminer S21+ is a high-performance Bitcoin mining machine engineered for maximum efficiency and robust hashrate output. With a 216 TH/s hashrate and power efficiency of 16.5 J/TH, this ASIC miner represents the latest evolution in SHA-256 cryptocurrency mining technology. Designed for serious miners seeking long-term profitability, the S21+ combines cutting-edge hardware with reliable performance, making it a top contender in today’s competitive mining landscape.
Whether you're upgrading from older models or expanding your mining farm, the Antminer S21+ delivers exceptional value through optimized energy consumption and industrial-grade durability. Backed by Bitmain’s reputation for innovation, this miner is built to meet the demands of modern Bitcoin mining operations.
Key Performance Metrics at a Glance
- Hashrate: 216.00 TH/s
- Power Consumption: 3,564W
- Power Efficiency: 16.5 J/TH
- Daily Profitability: ~$4.07 (based on current network conditions)
- Estimated ROI: 26.2 months
These figures position the S21+ as one of the most efficient high-output miners available. Its balance between raw computing power and energy use makes it ideal for miners operating in regions with moderate electricity costs.
Technical Specifications
Product Overview
| Feature | Specification |
|---|---|
| Model | Antminer S21+ |
| Algorithm | SHA-256 |
| Mineable Coins | BTC, BCH, BSV |
| Typical Hashrate | 216 TH/s |
| Power Draw (Wall) | 3,564W |
| Power Efficiency | 16.5 J/TH @ 25°C |
Note: All values are typical; actual performance may vary by ±3% for hashrate and ±5% for power.
Hardware Configuration
- Network Interface: RJ45 Ethernet (10/100M)
- Dimensions (Without Packaging): 450 × 219 × 293 mm
- Net Weight: 21.5 kg
- Gross Weight: 24.5 kg
- Noise Level: 76 dBA @ 30°C (maximum fan speed)
Environmental Requirements
- Operating Temperature: -20°C to 45°C
- Storage Temperature: -20°C to 70°C
- Humidity (Non-condensing): 10%–90% RH
- Max Operating Altitude: ≤2,000 meters
At altitudes above 900m, the maximum operating temperature decreases by 1°C per 300m increase.
Why the Antminer S21+ Stands Out
The Antminer S21+ is an upgraded version of the standard S21, boosting hashrate from 200 TH/s to 216 TH/s while maintaining the same industry-leading power efficiency. This improvement translates into higher daily earnings without increasing energy costs—making it a smart upgrade path for existing Bitmain users.
Designed specifically for Bitcoin (BTC) mining via the SHA-256 algorithm, the S21+ leverages advanced ASIC chips to deliver consistent, stable performance under continuous operation. It's ideal for large-scale mining farms and individual operators alike who prioritize reliability and return on investment.
Bitmain’s Leadership in Cryptocurrency Mining
Founded in 2013, Bitmain Technologies Ltd. revolutionized the crypto mining industry by introducing ASIC-based miners at scale. Before Bitmain, mining was largely done using GPUs and FPGAs—less efficient and slower than today’s standards. Bitmain’s shift to application-specific integrated circuits (ASICs) dramatically increased mining efficiency, setting new benchmarks for hashrate and energy performance.
Over the years, Bitmain has consistently led innovation with each new generation of Antminer devices—from the early S1 model to the current S21 series. Their commitment to R&D ensures that every release pushes the boundaries of what’s possible in computational power and thermal management.
Evolution of the Antminer Series: From S1 to S21+
The journey from the Antminer S1 to the S21+ reflects over a decade of relentless engineering progress:
- The S1, launched in 2013, offered around 180 GH/s with relatively poor efficiency.
- The S9, once the gold standard, delivered up to 14 TH/s and dominated the market for years.
- Fast forward to the S21+, which now offers 216 TH/s—more than 1,000 times the power of its predecessor—with vastly improved energy efficiency.
Each generation has reduced power consumption per terahash while increasing total output, enabling miners to achieve better returns even as network difficulty rises.
This technological leap not only benefits individual miners but also strengthens the overall security and decentralization of the Bitcoin network by raising the bar for entry-level mining performance.
Mining Profitability & Return on Investment (ROI)
With a daily estimated profit of $4.07, the Antminer S21+ offers a competitive edge in today’s market. While ROI depends heavily on electricity costs and Bitcoin price volatility, the average payback period is approximately 26.2 months under standard conditions.
Factors influencing profitability include:
- Local electricity rates
- Bitcoin market price
- Network difficulty adjustments
- Pool fees and uptime
Miners operating in regions with low-cost electricity (< $0.08/kWh) will see significantly faster ROI. Additionally, using efficient cooling systems and maintaining optimal ambient temperatures can extend hardware lifespan and reduce maintenance costs.
Frequently Asked Questions (FAQs)
What is the expected lifespan of the Antminer S21+?
With proper maintenance and operation in a clean, temperature-controlled environment, the Antminer S21+ can last 3 to 5 years. Regular dust cleaning, stable power supply, and adequate ventilation are key to maximizing longevity.
How does electricity cost affect mining profitability?
Electricity is the largest ongoing expense in mining. At $0.10/kWh, the S21+ remains profitable; however, at rates above $0.15/kWh, profits shrink significantly. Always calculate break-even points before deployment.
Does the Antminer S21+ come with a warranty?
Yes. Bitmain provides a 365-day factory warranty for brand-new units, covering defects in materials and workmanship under normal use.
Can I mine coins other than Bitcoin with this device?
Yes. The S21+ supports any cryptocurrency using the SHA-256 algorithm, including Bitcoin Cash (BCH) and Bitcoin SV (BSV). However, Bitcoin remains the most profitable due to its market dominance.
Is the Antminer S21+ suitable for home mining?
Due to its high power draw (3,564W) and noise level (76 dBA), it's best suited for dedicated mining facilities or industrial spaces. Home miners should consider power capacity and sound insulation before installation.
How is shipping handled for international orders?
New units ship from Shenzhen or Hong Kong via DHL or UPS, with delivery times of 5–10 business days internationally. Used units undergo testing prior to shipment (3–5 days processing). Buyers are responsible for customs duties unless DDP (Delivered Duty Paid) applies.
Compare Top SHA-256 Miners
Looking for alternatives? Here's how leading models stack up:
- Antminer S21 Hyd: 530 TH/s | 3486W | 15.8 J/TH | ~$8k
- Antminer S21 Pro: 200 TH/s | 3360W | 16.8 J/TH | ~$3,500
- Antminer S19 XP: 140 TH/s | 3010W | 21.5 J/TH | ~$3,800
- Whatsminer M50S: 174 TH/s | 3360W | 19.3 J/TH | ~$3,900
While some models offer lower upfront costs, the S21+ stands out for balancing high hashrate with excellent efficiency—making it a strong choice for scalable operations.
👉 Access real-time mining calculators and compare hardware performance side-by-side.
Final Thoughts
The Bitmain Antminer S21+ is more than just a powerful mining rig—it's a strategic investment in long-term crypto profitability. With its enhanced hashrate, proven efficiency, and support from one of the most trusted names in blockchain hardware, it’s well-positioned to deliver consistent returns in an evolving mining ecosystem.
For miners focused on maximizing output while minimizing energy waste, the S21+ sets a new benchmark in performance and reliability.
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