Bitmain Antminer S21+ Hyd (358Th) vs Avalon A1566
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21+ Hyd (358Th) | Specification | Avalon A1566 |
|---|---|---|
| 358.0 TH/s | Hashrate | 185.0 TH/s |
| 5,370 W | Power Consumption | 3,420 W |
| 15.0 J/TH | Efficiency | 18.5 J/TH |
| 50 dB | Noise Level | 75 dB |
| 12.8 kg | Weight | 14.9 kg |
| 18,322 BTU/hr | BTU Output | 11,669 BTU/hr |
| 44/100 | Home Mining Score | 36/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Canaan |
Profitability Comparison
Bitmain Antminer S21+ Hyd (358Th)
Avalon A1566
Based on BTC price of $76,982 and current network difficulty as of May 18, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the Bitmain Antminer S21+ Hyd (358Th) edges it: 5 of 6 factors go its way (efficiency, hashrate, home mining score, noise level, price-performance). Where it pulls away hardest is 94% more hashrate (358 vs 185 TH/s). That said, the Avalon A1566 isn't beaten everywhere — it still wins power consumption. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
The Bitmain Antminer S21+ Hyd (358Th) and Avalon A1566 diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitmain Antminer S21+ Hyd (358Th) 94% more hashrate (358 vs 185 TH/s)
- Avalon A1566 36% better power draw (5,370 vs 3,420 W)
- Bitmain Antminer S21+ Hyd (358Th) 19% better efficiency (15.0 vs 18.5 J/TH)
- Bitmain Antminer S21+ Hyd (358Th) 33% better noise (50.0 vs 75.0 dB)
- Bitmain Antminer S21+ Hyd (358Th) 14% better weight (12.8 vs 14.9 kg)
- Bitmain Antminer S21+ Hyd (358Th) 57% more heat output (18,322 vs 11,669 BTU/hr)
- Bitmain Antminer S21+ Hyd (358Th) 22% more home mining score (44.0 vs 36.0)
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+ Hyd (358Th) | Metric | Avalon A1566 |
|---|---|---|
| $2,757 | Upfront cost (MSRP) | $5,500 |
| -$0.21 | Daily net profit | -$1.65 |
| -$2,832 | Net after 1 year | -$6,104 |
| -$2,907 | Net after 2 years | -$6,708 |
| -$2,982 | Net after 3 years | -$7,311 |
| 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
Bitmain Antminer S21+ Hyd (358Th)Score: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21+ Hyd (358Th)15.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Bitmain Antminer S21+ Hyd (358Th) or Avalon A1566 more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21+ Hyd (358Th) is more profitable at $-0.21/day compared to $-1.65/day for the Avalon A1566. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Bitmain Antminer S21+ Hyd (358Th) vs Avalon A1566: which runs at a lower noise level?
The Bitmain Antminer S21+ Hyd (358Th) is quieter at 50 dB compared to the Avalon A1566 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+ Hyd (358Th) or the Avalon A1566?
The Bitmain Antminer S21+ Hyd (358Th) scores 44/100 on our Home Mining Score (vs 36/100 for the Avalon A1566). 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 Bitmain Antminer S21+ Hyd (358Th) and Avalon A1566?
The Bitmain Antminer S21+ Hyd (358Th) runs at 15.0 J/TH while the Avalon A1566 runs at 18.5 J/TH — a difference of 3.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 19% better efficiency (15.0 vs 18.5 J/TH).