Antminer S21 vs Antminer S21 Pro
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 | Specification | Antminer S21 Pro |
|---|---|---|
| 200.0 TH/s | Hashrate | 234.0 TH/s |
| 3,500 W | Power Consumption | 3,510 W |
| 17.5 J/TH | Efficiency | 15.0 J/TH |
| 75 dB | Noise Level | 75 dB |
| 14.6 kg | Weight | 15.0 kg |
| 11,942 BTU/hr | BTU Output | 11,976 BTU/hr |
| 36/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21
Antminer S21 Pro
Based on BTC price of $78,139 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Bitmain's S21 lineup includes both the standard S21 and the enhanced S21 Pro. Both use the same generation architecture but target different performance tiers.
The S21 Pro delivers higher hashrate and marginally better efficiency, but at a premium price. For most home miners, the standard S21 offers the best value. The Pro model targets operations where maximum hashrate per rack unit is the priority.
Spec Deltas
Stripped to the numbers, this is how far apart the Antminer S21 and Antminer S21 Pro sit on each measurable spec:
- Antminer S21 Pro 17% more hashrate (200 vs 234 TH/s)
- Antminer S21 Pro 14% better efficiency (17.5 vs 15.0 J/TH)
- Antminer S21 3% better weight (14.6 vs 15.0 kg)
- Antminer S21 20% more home mining score (36.0 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 | Metric | Antminer S21 Pro |
|---|---|---|
| $5,500 | Upfront cost (MSRP) | $6,800 |
| -$1.21 | Daily net profit | -$0.01 |
| -$5,941 | Net after 1 year | -$6,804 |
| -$6,382 | Net after 2 years | -$6,807 |
| -$6,823 | Net after 3 years | -$6,811 |
| 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 S21Score: 36/100. 75 dB noise level.
Best for Efficiency
Antminer S21 Pro15.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the S21 Pro worth the premium over the standard S21?
For home miners, the standard S21 typically offers better ROI due to its lower upfront cost. The Pro makes more sense for hosted or commercial operations where rack density matters.
Can both the S21 and S21 Pro run on standard household power?
Both require 240V circuits. The S21 Pro draws more power, so ensure your circuit breaker can handle the load. A dedicated 20A or 30A 240V circuit is recommended.