Antminer S21 Hydro vs Antminer T21
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Hydro | Specification | Antminer T21 |
|---|---|---|
| 335.0 TH/s | Hashrate | 190.0 TH/s |
| 5,360 W | Power Consumption | 3,610 W |
| 16.0 J/TH | Efficiency | 19.0 J/TH |
| 50 dB | Noise Level | 75 dB |
| 15.8 kg | Weight | 14.6 kg |
| 18,288 BTU/hr | BTU Output | 12,317 BTU/hr |
| 44/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21 Hydro
Antminer T21
Based on BTC price of $79,066 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Antminer S21 Hydro wins on 4 of 6 factors (efficiency, hashrate, home mining score, noise level). The standout gap is 76% more hashrate (335 vs 190 TH/s) in the Antminer S21 Hydro's favour. The Antminer T21 holds the edge in power consumption and price-performance. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
Stripped to the numbers, this is how far apart the Antminer S21 Hydro and Antminer T21 sit on each measurable spec:
- Antminer S21 Hydro 76% more hashrate (335 vs 190 TH/s)
- Antminer T21 33% better power draw (5,360 vs 3,610 W)
- Antminer S21 Hydro 16% better efficiency (16.0 vs 19.0 J/TH)
- Antminer S21 Hydro 33% better noise (50.0 vs 75.0 dB)
- Antminer T21 8% better weight (15.8 vs 14.6 kg)
- Antminer S21 Hydro 48% more heat output (18,288 vs 12,317 BTU/hr)
- Antminer S21 Hydro 47% more home mining score (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 T21 |
|---|---|---|
| $9,500 | Upfront cost (MSRP) | $4,200 |
| -$0.68 | Daily net profit | -$1.75 |
| -$9,746 | Net after 1 year | -$4,839 |
| -$9,993 | Net after 2 years | -$5,478 |
| -$10,239 | Net after 3 years | -$6,117 |
| 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
Which makes more money, the Antminer S21 Hydro or the Antminer T21?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 Hydro is more profitable at $-0.68/day compared to $-1.75/day for the Antminer T21. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the Antminer S21 Hydro or the Antminer T21 better for noise-sensitive spaces?
The Antminer S21 Hydro is quieter at 50 dB compared to the Antminer T21 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 T21?
The Antminer S21 Hydro scores 44/100 on our Home Mining Score (vs 30/100 for the Antminer T21). 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 Hydro and Antminer T21 on J/TH?
The Antminer S21 Hydro runs at 16.0 J/TH while the Antminer T21 runs at 19.0 J/TH — a difference of 3.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 16% better efficiency (16.0 vs 19.0 J/TH).