Bitmain Antminer S21 Immersion (301Th) vs Bitmain Antminer S23 Hyd 3U
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21 Immersion (301Th) | Specification | Bitmain Antminer S23 Hyd 3U |
|---|---|---|
| 301.0 TH/s | Hashrate | 1.2 PH/s |
| 5,569 W | Power Consumption | 11,020 W |
| 18.5 J/TH | Efficiency | 9.5 J/TH |
| 50 dB | Noise Level | 50 dB |
| 17.2 kg | Weight | — |
| 19,001 BTU/hr | BTU Output | 37,600 BTU/hr |
| 44/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Bitmain Antminer S21 Immersion (301Th)
Bitmain Antminer S23 Hyd 3U
Based on BTC price of $79,091 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Bitmain Antminer S23 Hyd 3U, which leads on 3 of 4 weighted factors (efficiency, hashrate, price-performance). Where it pulls away hardest is 285% more hashrate (301 vs 1,160 TH/s). That said, the Bitmain Antminer S21 Immersion (301Th) isn't beaten everywhere — it still wins power consumption. 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 (301Th) and Bitmain Antminer S23 Hyd 3U actually differ, with the gap quantified:
- Bitmain Antminer S23 Hyd 3U 285% more hashrate (301 vs 1,160 TH/s)
- Bitmain Antminer S21 Immersion (301Th) 49% better power draw (5,569 vs 11,020 W)
- Bitmain Antminer S23 Hyd 3U 49% better efficiency (18.5 vs 9.5 J/TH)
- Bitmain Antminer S23 Hyd 3U 98% more heat output (19,001 vs 37,600 BTU/hr)
Cost & ROI Over Time
Sticker price versus what the miner actually earns back: the table below projects cumulative net profit at a $0.10/kWh electricity rate.
| Bitmain Antminer S21 Immersion (301Th) | Metric | Bitmain Antminer S23 Hyd 3U |
|---|---|---|
| $3,333 | Upfront cost (MSRP) | $7,988 |
| -$2.41 | Daily net profit | $15.77 |
| -$4,212 | Net after 1 year | -$2,231 |
| -$5,092 | Net after 2 years | +$3,525 |
| -$5,972 | Net after 3 years | +$9,282 |
| Does not pay back at current rates (negative daily profit) | Payback period | Pays for itself in ~17 months at current rates |
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
Bitmain Antminer S23 Hyd 3U$18.18/day higher profit at current rates.
Best for Home Mining
TieBoth miners are equally suitable for home use.
Best for Efficiency
Bitmain Antminer S23 Hyd 3U9.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Bitmain Antminer S21 Immersion (301Th) or the Bitmain Antminer S23 Hyd 3U?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S23 Hyd 3U is more profitable at $15.77/day compared to $-2.41/day for the Bitmain Antminer S21 Immersion (301Th). 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 (301Th) or Bitmain Antminer S23 Hyd 3U?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Bitmain Antminer S21 Immersion (301Th) vs Bitmain Antminer S23 Hyd 3U: which fits a residential setup better?
Both miners score similarly on our Home Mining Score. Consider your specific constraints (noise tolerance, available power, heat needs) to decide.
How far apart are the Bitmain Antminer S21 Immersion (301Th) and Bitmain Antminer S23 Hyd 3U on J/TH?
The Bitmain Antminer S21 Immersion (301Th) runs at 18.5 J/TH while the Bitmain Antminer S23 Hyd 3U runs at 9.5 J/TH — a difference of 9.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 49% better efficiency (18.5 vs 9.5 J/TH).
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