Antminer S21 Profitability Guide: Why These Miners Are Still Worth It in 2025
Antminer S21 Series: Still Highly Profitable Despite Being Previous Generation
While Bitmain has released the newer Antminer S23 series, the Antminer S21 lineup remains one of the most profitable and cost-effective mining solutions available today. As the second-to-latest generation, these miners offer excellent Antminer S21 profitability at more accessible price points.
Complete Antminer S21 Model Lineup
The S21 series includes several high-performance models:
Standard Models
- Antminer S21 - The base model offering solid performance
- Bitmain Antminer S21 - Enhanced version with improved efficiency
- S21 Antminer - Compact design for space-conscious setups
Pro Series
- Antminer S21 Pro - Higher hashrate with optimized power consumption
- Bitmain Antminer S21 Pro - Professional-grade mining solution
- Antminer S21 Pro Profitability - Delivers exceptional returns on investment
Hydro-Cooled Models
- Antminer S21 Hyd - Water-cooled for maximum efficiency
- Bitmain Antminer S21 Hyd - Industrial-grade hydro cooling
- Antminer S21 Hyd 335t - High-performance 335 TH/s model
- Bitmain Antminer S21 Hyd 335th - Premium hydro-cooled variant
- Antminer S21 Hydro - Advanced cooling technology
- Bitmain Antminer S21 Hyd 335t - Top-tier performance model
XP Series
- Antminer S21 XP - Extended performance capabilities
- Antminer S21 XP Hyd - XP model with hydro cooling
Current Mining Equipment Profitability Comparison
Based on current market conditions, here's how different mining equipment performs:
Top Performing Models (Daily Profitability in CAD)
- Bitmain Antminer S23 Hyd 3U - CA$56.88/day
- Bitmain Antminer S21e XP Hyd 3U - CA$32.06/day
- Bitmain Antminer S23 Hyd - CA$28.44/day
- Bitmain Antminer S21 XP+ Hyd - CA$22.00/day
- Bitmain Antminer S21 XP Hyd - CA$19.22/day
- Auradine Teraflux AH3880 - CA$19.34/day
Excellent Value Performers
- Bitmain Antminer S23 Imm - CA$17.96/day
- Bitmain Antminer S21e XP Hyd - CA$16.03/day
- Bitdeer SealMiner A2 Pro Hyd - CA$15.45/day
- Bitmain Antminer S23 - CA$13.99/day
- Canaan Avalon A1560HA 2U - CA$11.76/day
Why Antminer S21 Models Remain Excellent Investments
Competitive Antminer S21 Price Points
With the release of the S23 series, Antminer S21 price points have become more attractive, offering better value for money while maintaining strong profitability.
Proven Reliability
The S21 series has established a track record of reliable performance, making models like the Antminer S21 Pro and Antminer S21 Hyd trusted choices for serious miners.
Lower Entry Costs
As previous-generation equipment, S21 models offer lower initial investment costs while still delivering solid Antminer S21 profitability.
Home Mining vs Professional Hosting
While these miners can be profitable at home, professional hosting offers significant advantages:
Cost Comparison for S21 Operations
| Location | Electricity Rate (CAD/kWh) | Monthly Cost (3,500W miner) |
|---|---|---|
| Quebec Home | $0.10 - $0.18 | $252 - $453 |
| Ontario Home | $0.13 - $0.17 | $327 - $428 |
| CaptainMining Hosting | $0.0877 - $0.098 | $221 - $247 |
Professional Hosting Benefits
- Lower electricity costs than most residential rates
- Expert maintenance for all S21 models
- Optimal cooling for hydro and air-cooled units
- 24/7 monitoring and support
- No noise, heat, or space concerns
Conclusion
The Antminer S21 series continues to offer excellent mining opportunities despite being the previous generation. With competitive pricing, proven reliability, and strong profitability metrics, these miners represent outstanding value in today's market.
Whether you choose the standard Antminer S21, the high-performance Antminer S21 Pro, or the efficient Antminer S21 Hyd models, professional hosting with CaptainMining ensures you maximize your returns while minimizing operational challenges.