Antminer S21 Review and Specs 2026
Bitmain · Released 2024-01 · Air-cooled Bitcoin ASIC
Full Specifications
| Manufacturer | Bitmain |
| Model | Antminer S21 |
| Algorithm | SHA-256 |
| Cooling Type | Air Cooling |
| Hashrate | 200 TH/s |
| Power Consumption | 3,500 W |
| Efficiency | 17.5 J/TH |
| Noise Level | 75 dB |
| Dimensions | 400×195×290 mm |
| Weight | 14.2 kg |
| Est. Market Price | $2,700 |
| Release Date | 2024-01 |
| Spec Confidence | ✓ Verified |
Where to Buy Antminer S21
Compare prices across trusted ASIC marketplaces. Prices vary — check each source for current availability.
Large used ASIC inventory. Good for budget buyers.
Shop now →Curated new and refurbished hardware with verified specs.
Shop now →Direct from manufacturer. Warranty included. Lead times vary.
Shop now →Affiliate disclosure: Lightning Mines may earn a commission on purchases through some links. This does not affect our reviews or recommendations.
ROI Analysis
Based on current network difficulty. Assumes Abundant Mines hosting at $225/month flat fee.
Pros & Cons
Pros
- +200 TH/s strong hashrate
- +More affordable than S21 Pro
- +Proven Bitmain S21 platform reliability
- +Good resale value retention
Cons
- −17.5 J/TH — less efficient than S21 Pro
- −Same 75 dB noise level as S21 Pro
- −Power requirements need industrial setup
Best For / Worst For
Hosted operations seeking a balance of cost and S21-generation performance
Home miners and anyone who can stretch budget to the S21 Pro
Frequently Asked Questions
Is the Antminer S21 profitable in 2026?
Profitability depends on live BTC price and network difficulty. At $100,000 BTC the Antminer S21 generates approximately 11.05 USD per day gross revenue at 200 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 earn per day?
The Antminer S21 mines approximately 0.00011052 BTC per day at current network difficulty (~113.7 EH). At $100,000 per BTC that's roughly $11 gross per day before electricity and hosting costs. Check the live calculator above for current BTC price.
What hosting providers support the Antminer S21?
The Antminer S21 uses Air Cooling. Compatible hosting providers include Abundant Mines, Simple Mining, EZ Blockchain. Abundant Mines is recommended for air-cooled miners at a flat $225/month all-in rate.
What is the efficiency of the Antminer S21?
The Antminer S21 achieves 17.5 J/TH (joules per terahash), meaning it uses 17.5 joules of energy for every terahash of mining power. This is excellent efficiency — among the best available.
Running the numbers on Antminer S21?
Use our Deal Analyzer to see real monthly profit at your hosting rate. Pre-filled with Antminer S21 specs.
Run the Numbers
Use our full profitability calculator pre-filled with Antminer S21 specs.
Calculate ROIBuy This Miner →Compatible Hosting Providers
Providers that support Air Cooling
Got a Deal on Antminer S21?
Score your deal in 60 seconds — hardware price, hosting rate, and ROI all analyzed.
Analyze My Deal →