Antminer S21 XP vs Bitdeer SealMiner A2 Hyd
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 XP | Specification | Bitdeer SealMiner A2 Hyd |
|---|---|---|
| 270.0 TH/s | Hashrate | 446.0 TH/s |
| 3,645 W | Power Consumption | 7,360 W |
| 13.5 J/TH | Efficiency | 16.5 J/TH |
| 75 dB | Noise Level | 50 dB |
| 15.4 kg | Weight | 20.5 kg |
| 12,437 BTU/hr | BTU Output | 25,112 BTU/hr |
| 30/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitdeer |
Profitability Comparison
Antminer S21 XP
Bitdeer SealMiner A2 Hyd
Based on BTC price of $79,051 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Run the numbers across every spec and the Bitdeer SealMiner A2 Hyd edges it: 4 of 6 factors go its way (hashrate, home mining score, noise level, price-performance). The standout gap is 65% more hashrate (270 vs 446 TH/s) in the Bitdeer SealMiner A2 Hyd's favour. The Antminer S21 XP claws back ground on efficiency and power consumption. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Spec Deltas
Here is every spec where the Antminer S21 XP and Bitdeer SealMiner A2 Hyd actually differ, with the gap quantified:
- Bitdeer SealMiner A2 Hyd 65% more hashrate (270 vs 446 TH/s)
- Antminer S21 XP 50% better power draw (3,645 vs 7,360 W)
- Antminer S21 XP 18% better efficiency (13.5 vs 16.5 J/TH)
- Bitdeer SealMiner A2 Hyd 33% better noise (75.0 vs 50.0 dB)
- Antminer S21 XP 25% better weight (15.4 vs 20.5 kg)
- Bitdeer SealMiner A2 Hyd 102% more heat output (12,437 vs 25,112 BTU/hr)
- Bitdeer SealMiner A2 Hyd 47% more home mining score (30.0 vs 44.0)
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 XP | Metric | Bitdeer SealMiner A2 Hyd |
|---|---|---|
| $8,200 | Upfront cost (MSRP) | $6,150 |
| $1.07 | Daily net profit | -$1.44 |
| -$7,808 | Net after 1 year | -$6,675 |
| -$7,416 | Net after 2 years | -$7,201 |
| -$7,024 | Net after 3 years | -$7,726 |
| Takes ~20.9 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
Antminer S21 XP$2.51/day higher profit at current rates.
Best for Home Mining
Bitdeer SealMiner A2 HydScore: 44/100. 50 dB noise level.
Best for Efficiency
Antminer S21 XP13.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Antminer S21 XP or the Bitdeer SealMiner A2 Hyd?
At the current BTC price and a $0.10/kWh electricity rate, the Antminer S21 XP is more profitable at $1.07/day compared to $-1.44/day for the Bitdeer SealMiner A2 Hyd. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21 XP or Bitdeer SealMiner A2 Hyd?
The Bitdeer SealMiner A2 Hyd is quieter at 50 dB compared to the Antminer S21 XP at 75 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer S21 XP or Bitdeer SealMiner A2 Hyd?
The Bitdeer SealMiner A2 Hyd scores 44/100 on our Home Mining Score (vs 30/100 for the Antminer S21 XP). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
Antminer S21 XP vs Bitdeer SealMiner A2 Hyd: how much does the efficiency gap matter?
The Antminer S21 XP runs at 13.5 J/TH while the Bitdeer SealMiner A2 Hyd runs at 16.5 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 18% better efficiency (13.5 vs 16.5 J/TH).
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