Antminer S21 Pro Review and Specs 2026
Bitmain · Released 2024-01 · Air-cooled Bitcoin ASIC
Full Specifications
| Manufacturer | Bitmain |
| Model | Antminer S21 Pro |
| Algorithm | SHA-256 |
| Cooling Type | Air Cooling |
| Hashrate | 234 TH/s |
| Power Consumption | 3,510 W |
| Efficiency | 15.0 J/TH |
| Noise Level | 75 dB |
| Dimensions | 400×195×290 mm |
| Weight | 14.4 kg |
| Est. Market Price | $3,800 |
| Release Date | 2024-01 |
| Spec Confidence | ✓ Verified |
Where to Buy Antminer S21 Pro
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ROI Analysis
Based on current network difficulty. Assumes Abundant Miners hosting at $225/month flat fee.
Pros & Cons
Pros
- +Best-in-class 15 J/TH efficiency for air cooling
- +234 TH/s industry-leading air hashrate
- +Bitmain warranty and global support network
- +Highest single-unit revenue of any air-cooled miner
Cons
- −High upfront cost vs older S19 generation
- −Requires 240V / 15A dedicated circuit
- −75 dB noise level requires industrial environment
Best For / Worst For
Large-scale hosted operations seeking best-in-class air-cooled efficiency
Home miners — 75 dB noise and 15A+ power draw is unsuitable for residential use
Frequently Asked Questions
Is the Antminer S21 Pro profitable in 2026?
Profitability depends on live BTC price and network difficulty. At $100,000 BTC the Antminer S21 Pro generates approximately 12.93 USD per day gross revenue at 234 TH/s. With typical hosted electricity costs, net daily profit depends heavily on your hosting rate. Use our calculator above for your specific scenario.
How much does the Antminer S21 Pro earn per day?
The Antminer S21 Pro mines approximately 0.00012931 BTC per day at current network difficulty (~113.7 EH). At $100,000 per BTC that's roughly $13 gross per day before electricity and hosting costs. Check the live calculator above for current BTC price.
What hosting providers support the Antminer S21 Pro?
The Antminer S21 Pro uses Air Cooling. Compatible hosting providers include Abundant Miners, Compass Mining, Core Scientific. Abundant Miners is recommended for air-cooled miners at a flat $225/month all-in rate.
What is the efficiency of the Antminer S21 Pro?
The Antminer S21 Pro achieves 15 J/TH (joules per terahash), meaning it uses 15 joules of energy for every terahash of mining power. This is excellent efficiency — among the best available.
Running the numbers on Antminer S21 Pro?
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