Bitmain Antminer S21 Immersion (227Th)
Bitmain Antminer S21 Immersion (227Th) vs Whatsminer M66S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21 Immersion (227Th) | Specification | Whatsminer M66S |
|---|---|---|
| 227.0 TH/s | Taux de hachage | 298.0 TH/s |
| 3,623 W | Consommation électrique | 5,518 W |
| 16.0 J/TH | Efficiency | 18.5 J/TH |
| 75 dB | Niveau de bruit | 50 dB |
| 17.2 kg | Weight | 13.5 kg |
| 12,362 BTU/hr | BTU Output | 18,827 BTU/hr |
| 30/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Bitmain Antminer S21 Immersion (227Th)
Whatsminer M66S
Based on BTC price of $78,230 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Selon notre analyse multifactorielle, le Bitmain Antminer S21 Immersion (227Th) l'emporte sur 3 des 6 facteurs (efficacité, consommation électrique, rapport qualité-prix). The standout gap is 34% better power draw (3,623 vs 5,518 W) in the Bitmain Antminer S21 Immersion (227Th)'s favour. The Whatsminer M66S holds the edge in hashrate and score de minage domestique and niveau sonore. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
Here is every spec where the Bitmain Antminer S21 Immersion (227Th) and Whatsminer M66S actually differ, with the gap quantified:
- Whatsminer M66S 31% more hashrate (227 vs 298 TH/s)
- Bitmain Antminer S21 Immersion (227Th) 34% better power draw (3,623 vs 5,518 W)
- Bitmain Antminer S21 Immersion (227Th) 14% better efficacité (16.0 vs 18.5 J/TH)
- Whatsminer M66S 33% better noise (75.0 vs 50.0 dB)
- Whatsminer M66S 21% better weight (17.2 vs 13.5 kg)
- Whatsminer M66S 52% more heat output (12,362 vs 18,827 BTU/hr)
- Whatsminer M66S 47% more score de minage domestique (30.0 vs 44.0)
Cost & ROI Over Time
A miner pays for itself in profit, not specs. These projections track upfront cost against one, two and three years of net earnings at $0.10/kWh.
| Bitmain Antminer S21 Immersion (227Th) | Metric | Whatsminer M66S |
|---|---|---|
| $3,269 | Upfront cost (MSRP) | $8,000 |
| -$0.52 | Daily net profit | -$2.52 |
| -$3,460 | Net after 1 year | -$8,918 |
| -$3,651 | Net after 2 years | -$9,836 |
| -$3,842 | Net after 3 years | -$10,754 |
| Does not pay back at current rates (negative daily profit) | Payback period | Does not pay back at current rates (negative daily profit) |
Projections assume continuous operation, a flat $0.10/kWh rate, and no hardware degradation, pool fees, or BTC price change. Real-world ROI varies.
Best For...
Best for Profitability
TieBoth miners produce similar daily profit.
Best for Home Mining
Whatsminer M66SScore: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21 Immersion (227Th)16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer S21 Immersion (227Th) vs Whatsminer M66S: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 Immersion (227Th) is more profitable at $-0.52/day compared to $-2.52/day for the Whatsminer M66S. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Bitmain Antminer S21 Immersion (227Th) or Whatsminer M66S?
The Whatsminer M66S is quieter at 50 dB compared to the Bitmain Antminer S21 Immersion (227Th) at 75 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Bitmain Antminer S21 Immersion (227Th) or the Whatsminer M66S?
The Whatsminer M66S scores 44/100 on our Home Mining Score (vs 30/100 for the Bitmain Antminer S21 Immersion (227Th)). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Bitmain Antminer S21 Immersion (227Th) and Whatsminer M66S on J/TH?
The Bitmain Antminer S21 Immersion (227Th) runs at 16.0 J/TH while the Whatsminer M66S runs at 18.5 J/TH — a difference of 2.6 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 14% better efficacité (16.0 vs 18.5 J/TH).
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