Antminer S21+ vs StealthMiner
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21+ | Specification | StealthMiner |
|---|---|---|
| 216.0 TH/s | Hashrate | 800.0 GH/s |
| 3,564 W | Power Consumption | 18 W |
| 16.5 J/TH | Efficiency | 22.5 J/TH |
| 75 dB | Noise Level | 28 dB |
| 15.0 kg | Weight | 1.5 kg |
| 12,160 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+
StealthMiner
Based on BTC price of $76,967 and current network difficulty as of May 18, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Antminer S21+ comes out ahead — it takes 3 of 6 (efficiency, hashrate, price-performance). The standout gap is 26900% more hashrate (216.0 vs 0.8 TH/s) in the Antminer S21+'s favour. The StealthMiner claws back ground on 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
Here is every spec where the Antminer S21+ and StealthMiner actually differ, with the gap quantified:
- Antminer S21+ 26900% more hashrate (216.0 vs 0.8 TH/s)
- StealthMiner 99% better power draw (3,564.0 vs 18.0 W)
- Antminer S21+ 27% better efficiency (16.5 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+ 19705% more heat output (12,160.4 vs 61.4 BTU/hr)
- StealthMiner 133% more home mining score (30.0 vs 70.0)
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+ | Metric | StealthMiner |
|---|---|---|
| $6,500 | Upfront cost (MSRP) | $199 |
| -$0.90 | Daily net profit | -$0.01 |
| -$6,830 | Net after 1 year | -$204 |
| -$7,159 | Net after 2 years | -$210 |
| -$7,489 | 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+16.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21+ or StealthMiner more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the StealthMiner is more profitable at $-0.01/day compared to $-0.90/day for the Antminer S21+. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21+ or StealthMiner?
The StealthMiner is quieter at 28 dB compared to the Antminer S21+ at 75 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer S21+ or StealthMiner?
The StealthMiner scores 70/100 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.
How far apart are the Antminer S21+ and StealthMiner on J/TH?
The Antminer S21+ runs at 16.5 J/TH while the StealthMiner runs at 22.5 J/TH — a difference of 6.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 27% better efficiency (16.5 vs 22.5 J/TH).