Antminer S21 Pro vs StealthMiner
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Pro | Specification | StealthMiner |
|---|---|---|
| 234.0 TH/s | Hashrate | 800.0 GH/s |
| 3,510 W | Power Consumption | 18 W |
| 15.0 J/TH | Efficiency | 22.5 J/TH |
| 75 dB | Noise Level | 28 dB |
| 15.0 kg | Weight | 1.5 kg |
| 11,976 BTU/hr | BTU Output | 61 BTU/hr |
| 30/100 | Home Mining Score | 70/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | D-Central |
Profitability Comparison
Antminer S21 Pro
StealthMiner
Based on BTC price of $76,967 and current network difficulty as of May 18, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Antminer S21 Pro wins on 3 of 6 factors (efficiency, hashrate, price-performance). Where it pulls away hardest is 29150% more hashrate (234.0 vs 0.8 TH/s). That said, the StealthMiner isn't beaten everywhere — it still wins power consumption and home mining score and noise level. Cross-check the spec deltas and operating-cost table above against your own electricity rate before deciding.
Spec Deltas
The Antminer S21 Pro and StealthMiner diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Antminer S21 Pro 29150% more hashrate (234.0 vs 0.8 TH/s)
- StealthMiner 99% better power draw (3,510.0 vs 18.0 W)
- Antminer S21 Pro 33% better efficiency (15.0 vs 22.5 J/TH)
- StealthMiner 63% better noise (75.0 vs 28.0 dB)
- StealthMiner 90% better weight (15.0 vs 1.5 kg)
- Antminer S21 Pro 19405% more heat output (11,976.1 vs 61.4 BTU/hr)
- StealthMiner 133% more home mining score (30.0 vs 70.0)
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.
| Antminer S21 Pro | Metric | StealthMiner |
|---|---|---|
| $6,800 | Upfront cost (MSRP) | $199 |
| -$0.14 | Daily net profit | -$0.01 |
| -$6,850 | Net after 1 year | -$204 |
| -$6,899 | Net after 2 years | -$210 |
| -$6,949 | Net after 3 years | -$215 |
| 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
StealthMinerScore: 70/100. 28 dB noise level.
Best for Efficiency
Antminer S21 Pro15.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Antminer S21 Pro vs StealthMiner: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the StealthMiner is more profitable at $-0.01/day compared to $-0.14/day for the Antminer S21 Pro. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21 Pro or StealthMiner?
The StealthMiner is quieter at 28 dB compared to the Antminer S21 Pro 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 Pro or the StealthMiner?
The StealthMiner scores 70/100 on our Home Mining Score (vs 30/100 for the Antminer S21 Pro). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
Antminer S21 Pro vs StealthMiner: how much does the efficiency gap matter?
The Antminer S21 Pro runs at 15.0 J/TH while the StealthMiner runs at 22.5 J/TH — a difference of 7.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 33% better efficiency (15.0 vs 22.5 J/TH).