Bitmain Antminer S15 (28Th) vs Antminer T21
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S15 (28Th) | Specification | Antminer T21 |
|---|---|---|
| 28.0 TH/s | Hashrate | 190.0 TH/s |
| 1,596 W | Power Consumption | 3,610 W |
| 57.0 J/TH | Efficiency | 19.0 J/TH |
| — | Noise Level | 75 dB |
| 7,000.0 kg | Weight | 14.6 kg |
| 5,446 BTU/hr | BTU Output | 12,317 BTU/hr |
| 28/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Bitmain Antminer S15 (28Th)
Antminer T21
Based on BTC price of $79,112 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Antminer T21, which leads on 5 of 6 weighted factors (efficiency, hashrate, home mining score, noise level, price-performance). Where it pulls away hardest is 579% more hashrate (28.0 vs 190.0 TH/s). That said, the Bitmain Antminer S15 (28Th) isn't beaten everywhere — it still wins power consumption. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
Stripped to the numbers, this is how far apart the Bitmain Antminer S15 (28Th) and Antminer T21 sit on each measurable spec:
- Antminer T21 579% more hashrate (28.0 vs 190.0 TH/s)
- Bitmain Antminer S15 (28Th) 56% better power draw (1,596 vs 3,610 W)
- Antminer T21 67% better efficiency (57.0 vs 19.0 J/TH)
- Antminer T21 100% better weight (7,000.0 vs 14.6 kg)
- Antminer T21 126% more heat output (5,446 vs 12,317 BTU/hr)
- Antminer T21 7% more home mining score (28.0 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.
| Bitmain Antminer S15 (28Th) | Metric | Antminer T21 |
|---|---|---|
| $5,599 | Upfront cost (MSRP) | $4,200 |
| -$2.81 | Daily net profit | -$1.75 |
| -$6,625 | Net after 1 year | -$4,838 |
| -$7,651 | Net after 2 years | -$5,475 |
| -$8,677 | Net after 3 years | -$6,113 |
| 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 T21Score: 30/100. 75 dB noise level.
Best for Efficiency
Antminer T2119.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Bitmain Antminer S15 (28Th) or Antminer T21 more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer T21 is more profitable at $-1.75/day compared to $-2.81/day for the Bitmain Antminer S15 (28Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Bitmain Antminer S15 (28Th) vs Antminer T21: which runs at a lower noise level?
The Antminer T21 is quieter at 75 dB compared to the Bitmain Antminer S15 (28Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Bitmain Antminer S15 (28Th) or Antminer T21?
The Antminer T21 scores 30/100 on our Home Mining Score (vs 28/100 for the Bitmain Antminer S15 (28Th)). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Bitmain Antminer S15 (28Th) and Antminer T21 on J/TH?
The Bitmain Antminer S15 (28Th) runs at 57.0 J/TH while the Antminer T21 runs at 19.0 J/TH — a difference of 38.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 67% better efficiency (57.0 vs 19.0 J/TH).