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Antminer S21 Hydro

Antminer S21 Hydro

Hashrate 335.0 TH/s Power 5,360 W Efficiency 16.0 J/TH
VS
Bitdeer SealMiner A2

Bitdeer SealMiner A2

Hashrate 226.0 TH/s Power 3,730 W Efficiency 16.5 J/TH

Antminer S21 Hydro vs Bitdeer SealMiner A2

Side-by-side specs, profitability, and home mining comparison.

Specifications Comparison

Antminer S21 Hydro Specification Bitdeer SealMiner A2
335.0 TH/s Hashrate 226.0 TH/s
5,360 W Power Consumption 3,730 W
16.0 J/TH Efficiency 16.5 J/TH
50 dB Noise Level 75 dB
15.8 kg Weight 15.5 kg
18,288 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

$/kWh

Antminer S21 Hydro

Daily Revenue 0.00014520 BTC $10.39
Daily Electricity -$12.86
Daily Profit -$2.48
Monthly -$74.33
Yearly -$904.31

Bitdeer SealMiner A2

Daily Revenue 0.00009795 BTC $7.01
Daily Electricity -$8.95
Daily Profit -$1.95
Monthly -$58.35
Yearly -$709.93

Based on BTC price of $71,534 and current network difficulty as of Mar 25, 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 Bitdeer SealMiner A2 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.

Winner: Antminer S21 Hydro — wins on 4 of 6 factors

Best For...

Best for Profitability

Tie

Both miners produce similar daily profit.

Best for Home Mining

Antminer S21 Hydro

Score: 44/100. 50 dB noise level.

Best for Efficiency

Antminer S21 Hydro

16.0 J/TH — lower electricity cost per terahash.

Frequently Asked Questions

Is the Antminer S21 Hydro or Bitdeer SealMiner A2 more profitable?

At the current BTC price and a $0.10/kWh electricity rate, the Bitdeer SealMiner A2 is more profitable at $-1.95/day compared to $-2.48/day for the Antminer S21 Hydro. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.

Which is quieter, the Antminer S21 Hydro or Bitdeer SealMiner A2?

The Antminer S21 Hydro 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.

Which is better for home mining, the Antminer S21 Hydro or Bitdeer SealMiner A2?

The Antminer S21 Hydro 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.

What is the efficiency difference between Antminer S21 Hydro and Bitdeer SealMiner A2?

The Antminer S21 Hydro runs at 16.0 J/TH while the Bitdeer SealMiner A2 runs at 16.5 J/TH — a difference of 0.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.

Compare Antminer S21 Hydro with...

Compare Bitdeer SealMiner A2 with...

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