Bitmain Antminer S21 XP Hyd

Hashrate 473.0 TH/s Power 5,676 W Efficiency 12.0 J/TH

Bitdeer SealMiner A2 Pro Hyd

Hashrate 500.0 TH/s Power 7,450 W Efficiency 14.9 J/TH

Bitmain Antminer S21 XP Hyd vs Bitdeer SealMiner A2 Pro Hyd

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

Specifications Comparison

Bitmain Antminer S21 XP Hyd	Specification	Bitdeer SealMiner A2 Pro Hyd
473.0 TH/s	Hashrate	500.0 TH/s
5,676 W	Power Consumption	7,450 W
12.0 J/TH	Efficiency	14.9 J/TH
50 dB	Noise Level	50 dB
12.3 kg	Weight	20.5 kg
19,367 BTU/hr	BTU Output	25,419 BTU/hr
44/100	Home Mining Score	44/100
—	Release Year	—
SHA-256	Algorithm	SHA-256
Bitmain	Manufacturer	Bitdeer

Profitability Comparison

Electricity Rate:

$/kWh

Bitmain Antminer S21 XP Hyd

Daily Revenue 0.00021767 BTC $16.95

Daily Electricity -$13.62

Daily Profit $3.33

Monthly $99.77

Yearly $1,213.83

Bitdeer SealMiner A2 Pro Hyd

Daily Revenue 0.00023009 BTC $17.92

Daily Electricity -$17.88

Daily Profit $0.04

Monthly $1.06

Yearly $12.92

Based on BTC price of $77,862 and current network difficulty as of May 16, 2026. Actual results vary.

Verdict

Run the numbers across every spec and the Bitmain Antminer S21 XP Hyd edges it: 2 of 4 factors go its way (efficiency, power consumption). Its biggest concrete edge: 24% better power draw (5,676 vs 7,450 W). The Bitdeer SealMiner A2 Pro Hyd holds the edge in hashrate and price-performance. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.

Winner: Bitmain Antminer S21 XP Hyd — wins on 2 of 4 factors

Spec Deltas

The Bitmain Antminer S21 XP Hyd and Bitdeer SealMiner A2 Pro Hyd diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":

Bitdeer SealMiner A2 Pro Hyd 6% more hashrate (473 vs 500 TH/s)
Bitmain Antminer S21 XP Hyd 24% better power draw (5,676 vs 7,450 W)
Bitmain Antminer S21 XP Hyd 19% better efficiency (12.0 vs 14.9 J/TH)
Bitmain Antminer S21 XP Hyd 40% better weight (12.3 vs 20.5 kg)
Bitdeer SealMiner A2 Pro Hyd 31% more heat output (19,367 vs 25,419 BTU/hr)

Cost & ROI Over Time

Sticker price versus what the miner actually earns back: the table below projects cumulative net profit at a $0.10/kWh electricity rate.

Bitmain Antminer S21 XP Hyd	Metric	Bitdeer SealMiner A2 Pro Hyd
$5,099	Upfront cost (MSRP)	$4,600
$3.33	Daily net profit	$0.04
-$3,885	Net after 1 year	-$4,587
-$2,671	Net after 2 years	-$4,574
-$1,458	Net after 3 years	-$4,561
Takes ~4.2 years to pay back at current rates	Payback period	Takes ~356.1 years to pay back at current rates

At the default rate, the Bitmain Antminer S21 XP Hyd reaches break-even first — but plug in your own electricity cost above, since payback shifts sharply with it.

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

$3.29/day higher profit at current rates.

Best for Home Mining

Tie

Both miners are equally suitable for home use.

Best for Efficiency

Bitmain Antminer S21 XP Hyd

12.0 J/TH — lower electricity cost per terahash.

Frequently Asked Questions

Is the Bitmain Antminer S21 XP Hyd or Bitdeer SealMiner A2 Pro Hyd more profitable?

At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 XP Hyd is more profitable at $3.33/day compared to $0.04/day for the Bitdeer SealMiner A2 Pro Hyd. 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 Pro Hyd better for noise-sensitive spaces?

Both miners have similar noise levels. Check the specs table above for exact decibel readings.

Bitmain Antminer S21 XP Hyd vs Bitdeer SealMiner A2 Pro Hyd: which fits a residential setup better?

Both miners score similarly on our Home Mining Score. Consider your specific constraints (noise tolerance, available power, heat needs) to decide.

What is the efficiency difference between Bitmain Antminer S21 XP Hyd and Bitdeer SealMiner A2 Pro Hyd?

The Bitmain Antminer S21 XP Hyd runs at 12.0 J/TH while the Bitdeer SealMiner A2 Pro Hyd runs at 14.9 J/TH — a difference of 2.9 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 19% better efficiency (12.0 vs 14.9 J/TH).

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