Antminer T21 vs Bitdeer SealMiner A3 Pro Hydro
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer T21 | Specification | Bitdeer SealMiner A3 Pro Hydro |
|---|---|---|
| 190.0 TH/s | Taux de hachage | 660.0 TH/s |
| 3,610 W | Consommation électrique | 8,250 W |
| 19.0 J/TH | Efficiency | 12.5 J/TH |
| 75 dB | Niveau de bruit | 50 dB |
| 14.6 kg | Weight | 20.5 kg |
| 12,317 BTU/hr | BTU Output | 28,149 BTU/hr |
| 30/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | Bitdeer |
Profitability Comparison
Antminer T21
Bitdeer SealMiner A3 Pro Hydro
Based on BTC price of $63,093 and current network difficulty as of Jun 4, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Bitdeer SealMiner A3 Pro Hydro, which leads on 5 of 6 weighted factors (efficacité, hashrate, score de minage domestique, niveau sonore, rapport qualité-prix). Its biggest concrete edge: 247% more hashrate (190 vs 660 TH/s). The Antminer T21 claws back ground on consommation électrique. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
The Antminer T21 and Bitdeer SealMiner A3 Pro Hydro diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitdeer SealMiner A3 Pro Hydro 247% more hashrate (190 vs 660 TH/s)
- Antminer T21 56% better power draw (3,610 vs 8,250 W)
- Bitdeer SealMiner A3 Pro Hydro 34% better efficacité (19.0 vs 12.5 J/TH)
- Bitdeer SealMiner A3 Pro Hydro 33% better noise (75.0 vs 50.0 dB)
- Antminer T21 29% better weight (14.6 vs 20.5 kg)
- Bitdeer SealMiner A3 Pro Hydro 129% more heat output (12,317 vs 28,149 BTU/hr)
- Bitdeer SealMiner A3 Pro Hydro 47% more score de minage domestique (30.0 vs 44.0)
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.
| Antminer T21 | Metric | Bitdeer SealMiner A3 Pro Hydro |
|---|---|---|
| $4,200 | Upfront cost (MSRP) | $7,995 |
| -$3.24 | Daily net profit | -$0.96 |
| -$5,383 | Net after 1 year | -$8,346 |
| -$6,566 | Net after 2 years | -$8,697 |
| -$7,749 | Net after 3 years | -$9,047 |
| 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
Bitdeer SealMiner A3 Pro HydroScore: 44/100. 50 dB noise level.
Best for Efficiency
Bitdeer SealMiner A3 Pro Hydro12.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Antminer T21 vs Bitdeer SealMiner A3 Pro Hydro: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitdeer SealMiner A3 Pro Hydro is more profitable at $-0.96/day compared to $-3.24/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 T21 or the Bitdeer SealMiner A3 Pro Hydro better for noise-sensitive spaces?
The Bitdeer SealMiner A3 Pro 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.
Antminer T21 vs Bitdeer SealMiner A3 Pro Hydro: which fits a residential setup better?
The Bitdeer SealMiner A3 Pro 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.
What is the efficiency difference between Antminer T21 and Bitdeer SealMiner A3 Pro Hydro?
The Antminer T21 runs at 19.0 J/TH while the Bitdeer SealMiner A3 Pro Hydro runs at 12.5 J/TH — a difference of 6.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 34% better efficacité (19.0 vs 12.5 J/TH).
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