Bitmain Antminer S21 XP Hyd vs Bitdeer SealMiner A2
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21 XP Hyd | Specification | Bitdeer SealMiner A2 |
|---|---|---|
| 473.0 TH/s | Hashrate | 226.0 TH/s |
| 5,676 W | Power Consumption | 3,730 W |
| 12.0 J/TH | Efficiency | 16.5 J/TH |
| 50 dB | Noise Level | 75 dB |
| 12.3 kg | Weight | 15.5 kg |
| 19,367 BTU/hr | BTU Output | 12,727 BTU/hr |
| 44/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitdeer |
Profitability Comparison
Bitmain Antminer S21 XP Hyd
Bitdeer SealMiner A2
Based on BTC price of $79,097 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Bitmain Antminer S21 XP Hyd wins on 5 of 6 factors (efficiency, hashrate, home mining score, noise level, price-performance). Its biggest concrete edge: 109% more hashrate (473 vs 226 TH/s). That said, the Bitdeer SealMiner A2 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
The Bitmain Antminer S21 XP Hyd and Bitdeer SealMiner A2 diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitmain Antminer S21 XP Hyd 109% more hashrate (473 vs 226 TH/s)
- Bitdeer SealMiner A2 34% better power draw (5,676 vs 3,730 W)
- Bitmain Antminer S21 XP Hyd 27% better efficiency (12.0 vs 16.5 J/TH)
- Bitmain Antminer S21 XP Hyd 33% better noise (50.0 vs 75.0 dB)
- Bitmain Antminer S21 XP Hyd 21% better weight (12.3 vs 15.5 kg)
- Bitmain Antminer S21 XP Hyd 52% more heat output (19,367 vs 12,727 BTU/hr)
- Bitmain Antminer S21 XP Hyd 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.
| Bitmain Antminer S21 XP Hyd | Metric | Bitdeer SealMiner A2 |
|---|---|---|
| $5,099 | Upfront cost (MSRP) | $2,760 |
| $3.59 | Daily net profit | -$0.73 |
| -$3,787 | Net after 1 year | -$3,025 |
| -$2,475 | Net after 2 years | -$3,290 |
| -$1,163 | Net after 3 years | -$3,555 |
| Takes ~3.9 years to pay back at current rates | 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
Bitmain Antminer S21 XP Hyd$4.32/day higher profit at current rates.
Best for Home Mining
Bitmain Antminer S21 XP HydScore: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21 XP Hyd12.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer S21 XP Hyd vs Bitdeer SealMiner A2: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 XP Hyd is more profitable at $3.59/day compared to $-0.73/day for the Bitdeer SealMiner A2. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the Bitmain Antminer S21 XP Hyd or the Bitdeer SealMiner A2 better for noise-sensitive spaces?
The Bitmain Antminer S21 XP Hyd is quieter at 50 dB compared to the Bitdeer SealMiner A2 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 XP Hyd or the Bitdeer SealMiner A2?
The Bitmain Antminer S21 XP Hyd scores 44/100 on our Home Mining Score (vs 30/100 for the Bitdeer SealMiner A2). 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 S21 XP Hyd and Bitdeer SealMiner A2 on J/TH?
The Bitmain Antminer S21 XP Hyd runs at 12.0 J/TH while the Bitdeer SealMiner A2 runs at 16.5 J/TH — a difference of 4.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 27% better efficiency (12.0 vs 16.5 J/TH).
Compare Bitmain Antminer S21 XP Hyd with...
Compare Bitdeer SealMiner A2 with...
- Bitdeer SealMiner A2 vs Bitdeer SealMiner A2 Hyd
- Bitdeer SealMiner A2 vs Bitdeer SealMiner A2 Pro Air
- Bitdeer SealMiner A2 vs Bitdeer SealMiner A2 Pro Hyd
- Bitdeer SealMiner A2 vs Bitdeer SealMiner A3 Air
- Bitdeer SealMiner A2 vs Bitdeer SealMiner A3 Hydro
- Bitdeer SealMiner A2 vs Bitdeer SealMiner A3 Pro Air