Antminer S21 vs Bitmain Antminer S21+ Hyd
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 | Specification | Bitmain Antminer S21+ Hyd |
|---|---|---|
| 200.0 TH/s | Hashrate | 319.0 TH/s |
| 3,500 W | Power Consumption | 4,785 W |
| 17.5 J/TH | Efficiency | 15.0 J/TH |
| 75 dB | Noise Level | 50 dB |
| 14.6 kg | Weight | 17.5 kg |
| 11,942 BTU/hr | BTU Output | 16,326 BTU/hr |
| 36/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21
Bitmain Antminer S21+ Hyd
Based on BTC price of $74,336 and current network difficulty as of Mar 17, 2026. Actual results vary.
Verdict
Same generation, different cooling: the air-cooled S21 versus the hydro-cooled S21 Hyd. Water cooling promises quieter operation and better thermal management.
The S21 Hyd offers quieter operation and potentially higher sustained hashrate through superior cooling. However, it requires liquid cooling infrastructure that most home miners lack. The air-cooled S21 is simpler to deploy.
Best For...
Best for Profitability
TieBoth miners produce similar daily profit.
Best for Home Mining
Bitmain Antminer S21+ HydScore: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21+ Hyd15.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the S21 Hyd quieter than the air-cooled S21?
Yes, significantly. The fans on hydro units run at lower speeds since liquid cooling handles most of the heat dissipation. However, the cooling system itself adds pump noise.
Do I need special infrastructure for the S21 Hyd?
Yes. You need a liquid cooling loop with a heat exchanger or dry cooler, coolant, pumps, and plumbing. This is typically only practical for commercial operations.