Bitmain Antminer S21 (200Th)

Hashrate 200.0 TH/s Power 3,550 W Efficiency 17.8 J/TH

Bitdeer SealMiner A3 Air

Hashrate 260.0 TH/s Power 3,640 W Efficiency 14.0 J/TH

Bitmain Antminer S21 (200Th) vs Bitdeer SealMiner A3 Air

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

Specifications Comparison

Bitmain Antminer S21 (200Th)	Specification	Bitdeer SealMiner A3 Air
200.0 TH/s	Hashrate	260.0 TH/s
3,550 W	Power Consumption	3,640 W
17.8 J/TH	Efficiency	14.0 J/TH
—	Noise Level	75 dB
14.2 kg	Weight	15.5 kg
12,113 BTU/hr	BTU Output	12,420 BTU/hr
16/100	Home Mining Score	30/100
—	Release Year	—
SHA-256	Algorithm	SHA-256
Bitmain	Manufacturer	Bitdeer

Profitability Comparison

Electricity Rate:

$/kWh

Bitmain Antminer S21 (200Th)

Daily Revenue 0.00009272 BTC $7.17

Daily Electricity -$8.52

Daily Profit -$1.35

Monthly -$40.47

Yearly -$492.36

Bitdeer SealMiner A3 Air

Daily Revenue 0.00012054 BTC $9.32

Daily Electricity -$8.74

Daily Profit $0.59

Monthly $17.59

Yearly $214.03

Based on BTC price of $77,338 and current network difficulty as of Apr 25, 2026. Actual results vary.

Verdict

Based on our multi-factor analysis, the Bitdeer SealMiner A3 Air wins on 4 of 6 factors (efficiency, hashrate, home mining score, noise level). The Bitmain Antminer S21 (200Th) 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: Bitdeer SealMiner A3 Air — wins on 4 of 6 factors

Best For...

Best for Profitability

Bitdeer SealMiner A3 Air

$1.94/day higher profit at current rates.

Best for Home Mining

Bitdeer SealMiner A3 Air

Score: 30/100. 75 dB noise level.

Best for Efficiency

Bitdeer SealMiner A3 Air

14.0 J/TH — lower electricity cost per terahash.

Frequently Asked Questions

Is the Bitmain Antminer S21 (200Th) or Bitdeer SealMiner A3 Air more profitable?

At the current BTC price and a $0.10/kWh electricity rate, the Bitdeer SealMiner A3 Air is more profitable at $0.59/day compared to $-1.35/day for the Bitmain Antminer S21 (200Th). Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.

Which is quieter, the Bitmain Antminer S21 (200Th) or Bitdeer SealMiner A3 Air?

The Bitdeer SealMiner A3 Air is quieter at 75 dB compared to the Bitmain Antminer S21 (200Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.

Which is better for home mining, the Bitmain Antminer S21 (200Th) or Bitdeer SealMiner A3 Air?

The Bitdeer SealMiner A3 Air scores 30/100 on our Home Mining Score (vs 16/100 for the Bitmain Antminer S21 (200Th)). 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 Bitmain Antminer S21 (200Th) and Bitdeer SealMiner A3 Air?

The Bitmain Antminer S21 (200Th) runs at 17.8 J/TH while the Bitdeer SealMiner A3 Air runs at 14.0 J/TH — a difference of 3.8 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.

Compare Bitmain Antminer S21 (200Th) with...

Compare Bitdeer SealMiner A3 Air with...

Shop Miners Browse our full catalog of ASIC miners, Bitaxe, and accessories. ASIC Repair 2,500+ miners repaired. Expert diagnostics and board-level repair. Miner Database Compare 500+ miners with live profitability data.