Antminer S21 Hydro vs Antminer S21+
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Hydro | Specification | Antminer S21+ |
|---|---|---|
| 335.0 TH/s | Taux de hachage | 216.0 TH/s |
| 5,360 W | Consommation électrique | 3,564 W |
| 16.0 J/TH | Efficiency | 16.5 J/TH |
| 50 dB | Niveau de bruit | 75 dB |
| 15.8 kg | Weight | 15.0 kg |
| 18,288 BTU/hr | BTU Output | 12,160 BTU/hr |
| 44/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21 Hydro
Antminer S21+
Based on BTC price of $78,179 and current network difficulty as of May 17, 2026. Actual results vary.
Verdict
Selon notre analyse multifactorielle, le Antminer S21 Hydro l'emporte sur 5 des 6 facteurs (efficacité, hashrate, score de minage domestique, niveau sonore, rapport qualité-prix). The standout gap is 55% more hashrate (335 vs 216 TH/s) in the Antminer S21 Hydro's favour. The Antminer S21+ holds the edge in consommation électrique. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
Here is every spec where the Antminer S21 Hydro and Antminer S21+ actually differ, with the gap quantified:
- Antminer S21 Hydro 55% more hashrate (335 vs 216 TH/s)
- Antminer S21+ 34% better power draw (5,360 vs 3,564 W)
- Antminer S21 Hydro 3% better efficacité (16.0 vs 16.5 J/TH)
- Antminer S21 Hydro 33% better noise (50.0 vs 75.0 dB)
- Antminer S21+ 5% better weight (15.8 vs 15.0 kg)
- Antminer S21 Hydro 50% more heat output (18,288 vs 12,160 BTU/hr)
- Antminer S21 Hydro 47% more score de minage domestique (44.0 vs 30.0)
Cost & ROI Over Time
Hardware cost is only half the story — here is how each miner's upfront price plays out against cumulative profit at a $0.10/kWh rate.
| Antminer S21 Hydro | Metric | Antminer S21+ |
|---|---|---|
| $9,500 | Upfront cost (MSRP) | $6,500 |
| -$0.81 | Daily net profit | -$0.78 |
| -$9,796 | Net after 1 year | -$6,786 |
| -$10,093 | Net after 2 years | -$7,071 |
| -$10,389 | Net after 3 years | -$7,357 |
| 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
Antminer S21 HydroScore: 44/100. 50 dB noise level.
Best for Efficiency
Antminer S21 Hydro16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21 Hydro or Antminer S21+ more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21+ is more profitable at $-0.78/day compared to $-0.81/day for the Antminer S21 Hydro. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Antminer S21 Hydro vs Antminer S21+: which runs at a lower noise level?
The Antminer S21 Hydro is quieter at 50 dB compared to the Antminer S21+ at 75 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Antminer S21 Hydro or the Antminer S21+?
The Antminer S21 Hydro scores 44/100 on our Home Mining Score (vs 30/100 for the Antminer S21+). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
What is the efficiency difference between Antminer S21 Hydro and Antminer S21+?
The Antminer S21 Hydro runs at 16.0 J/TH while the Antminer S21+ runs at 16.5 J/TH — a difference of 0.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 3% better efficacité (16.0 vs 16.5 J/TH).