Antminer S21 Series
The ultimate Bitcoin mining solution designed for the post-halving era. With industry-leading efficiency from 13-17.5 J/Th and hashrates up to 860 TH/s, the S21 series delivers exceptional ROI in today's competitive mining landscape.
Why Antminer S21 Series?
Post-Halving Optimized Performance
Engineered specifically for Bitcoin's reduced block reward environment (3.125 BTC per block), the S21 series combines superior energy efficiency with robust hashrate performance to maintain profitability when many older miners become obsolete.
S21 Series Models
S21e XP Hyd 3U 🚀
The flagship model - Ultimate performance with hydrocooling technology for maximum efficiency and longevity.
| Hashrate | 860 TH/s |
| Power Consumption | 11,180W |
| Efficiency | 13 J/Th |
| Cooling | Hydro |
| Est. Price | $20,000 |
| Payback Period | 27.5 months |
S21 XP+ Hyd (500Th)
High-efficiency powerhouse - Exceptional 11 J/Th efficiency with professional hydrocooling system.
| Hashrate | 500 TH/s |
| Power Consumption | 5,500W |
| Efficiency | 11 J/Th |
| Cooling | Hydro |
| Est. Price | $12,700 |
| Payback Period | 26.9 months |
S21 Hyd (335Th)
Balanced performance - Optimal balance of hashrate, efficiency, and investment cost with hydrocooling.
| Hashrate | 335 TH/s |
| Power Consumption | 5,360W |
| Efficiency | 16 J/Th |
| Cooling | Hydro |
| Est. Price | $5,500 |
| Payback Period | 23.6 months |
S21 (Air-cooled)
Entry-level option - Accessible air-cooled solution perfect for standard mining setups.
| Hashrate | 200 TH/s |
| Power Consumption | 3,500W |
| Efficiency | 17.5 J/Th |
| Cooling | Air |
| Est. Price | $5,400 |
| Payback Period | 43.6 months |
S21e Hyd ⭐
Best ROI performer - Fastest payback period with excellent efficiency and moderate investment.
| Hashrate | 288 TH/s |
| Power Consumption | 4,896W |
| Efficiency | 17 J/Th |
| Cooling | Hydro |
| Est. Price | $3,456 |
| Payback Period | 18.6 months |
S21 Pro
Professional choice - Balanced specifications for professional mining operations.
| Hashrate | 234 TH/s |
| Power Consumption | 3,510W |
| Efficiency | 15 J/Th |
| Cooling | Air/Immersion |
| Est. Price | $3,744 |
| Payback Period | 21.4 months |
Technical Advantages
🔥 Hydrocooling Technology
Advanced liquid cooling systems enable higher hashrates, better stability, and longer lifespan. Hydrocooled models achieve superior efficiency ratings essential for post-halving profitability.
⚡ Energy Efficiency
With efficiency ratings as low as 13 J/Th, S21 series miners consume significantly less electricity per terahash, directly reducing operational costs and improving profit margins.
🎯 SHA-256 Optimization
Specifically engineered for Bitcoin (BTC), Bitcoin Cash (BCH), and Bitcoin SV (BSV) mining with optimized chip architecture for maximum performance.
📈 Post-Halving Design
Released around the April 2024 Bitcoin halving, these miners are designed to remain profitable in the reduced block reward environment (3.125 BTC per block).
Profitability Analysis
Estimated daily profits based on current Bitcoin network conditions and various electricity rates:
| Model | Daily Revenue | Daily Cost @3¢/kWh | Daily Cost @7¢/kWh | Daily Cost @10¢/kWh | Net Profit @7¢/kWh | Payback Period |
|---|---|---|---|---|---|---|
| S21e XP Hyd 3U | $43.00 | $8.05 | $18.78 | $26.83 | $24.22 | 27.5 months |
| S21 XP+ Hyd | $25.00 | $3.96 | $9.24 | $13.20 | $15.76 | 26.9 months |
| S21 Hyd | $16.75 | $3.86 | $9.00 | $12.86 | $7.75 | 23.6 months |
| S21e Hyd ⭐ | $14.40 | $3.53 | $8.22 | $11.75 | $6.18 | 18.6 months |
| S21 Air | $10.00 | $2.52 | $5.88 | $8.40 | $4.12 | 43.6 months |
💡 Key Insight
The S21e Hyd offers the fastest payback period at just 18.6 months, making it our top recommendation for miners seeking the best ROI. Hydrocooled models significantly outperform air-cooled variants in efficiency and long-term profitability.
Get Your Antminer S21 Today
Secure the most efficient Bitcoin miners before the next difficulty adjustment. Our mining experts will help you choose the optimal S21 model for your operation.
Disclaimer: S21 specifications and pricing based on August 2025 data. Mining involves financial risks. This does not constitute investment advice. All information is indicative and non-binding. Contact us for current availability and personalized consultation.