Bitmain Antminer S21 Pro vs Canaan Avalon A1566

Mining profitability comparison for Bitcoin (BTC), Bitcoin Cash (BCH)

★ Bitmain Antminer S21 Pro is more efficient for Bitcoin mining

Verdict: Bitmain Antminer S21 Pro vs Canaan Avalon A1566

For Bitcoin mining, the Bitmain Antminer S21 Pro is the more efficient choice, delivering roughly 24% more hashrate per watt than the Canaan Avalon A1566. The Canaan Avalon A1566 draws 80W less, cutting electricity costs by about $49/year at $0.07/kWh. Bottom line: if power efficiency is your priority, the Bitmain Antminer S21 Pro is the stronger pick — but confirm with your real electricity rate and current hardware prices below, since acquisition cost ultimately drives ROI.

Specifications

Spec Bitmain Antminer S21 Pro Canaan Avalon A1566
Type ASIC ASIC
Algorithm
Hashrate (BTC) 234 TH/s 185 TH/s
Power Draw 3510 W 3430 W
Efficiency 15 J/TH 18.5 J/TH
Supported Coins BTC, BCH BTC, BCH
Release Year N/A N/A

Hashrate & Efficiency per Coin

Coin Bitmain Pro HR Canaan A1566 HR Power A Power B More Efficient
BTC 234 TH/s 185 TH/s 3510 W 3430 W S21 ✓
BCH 234 TH/s 185 TH/s 3510 W 3430 W S21 ✓

Daily Electricity Cost at Different Rates

Electricity cost only (not including coin revenue). Lower is better for any given rate.

Electricity Rate Bitmain Antminer S21 Pro Canaan Avalon A1566 Difference
$0.04/kWh $3.37 $3.29 +$0.08 (B cheaper)
$0.06/kWh $5.05 $4.94 +$0.12 (B cheaper)
$0.07/kWh $5.90 $5.76 +$0.13 (B cheaper)
$0.1/kWh $8.42 $8.23 +$0.19 (B cheaper)
$0.12/kWh $10.11 $9.88 +$0.23 (B cheaper)
$0.15/kWh $12.64 $12.35 +$0.29 (B cheaper)
$0.2/kWh $16.85 $16.46 +$0.38 (B cheaper)

Pros & Cons

Bitmain Antminer S21 Pro

  • Highest hashrate in Bitmain's S21 lineup (234 TH/s)
  • Best-in-class SHA-256 efficiency at 15 J/TH
  • Mature Bitmain firmware ecosystem with BOS+ support
  • High acquisition cost ($4,000–$5,000 new)
  • 3,510 W draw requires a dedicated 16 A / 220 V circuit
  • 75 dB noise — unsuitable for residential environments

Canaan Avalon A1566

  • Manufacturer diversity — an alternative to Bitmain/MicroBT duopoly
  • Competitive efficiency at 18.5 J/TH
  • Strong track record for reliability in large-scale deployments
  • Smaller firmware and third-party support ecosystem
  • Fewer authorised resellers outside Asia
  • Slightly lower absolute hashrate than the S21 (185 vs 200 TH/s)

Frequently Asked Questions

Is the Bitmain Antminer S21 Pro or Canaan Avalon A1566 more profitable for Bitcoin mining?

Based on hashrate-per-watt efficiency, the Bitmain Antminer S21 Pro is more efficient for Bitcoin mining. However, actual profitability depends on your electricity cost, hardware acquisition price, and coin price — use the live calculator for exact numbers.

What is the power consumption difference between the Bitmain Antminer S21 Pro and Canaan Avalon A1566?

For Bitcoin mining, the Bitmain Antminer S21 Pro draws 3510 W while the Canaan Avalon A1566 draws 3430 W. The Canaan Avalon A1566 uses 80 W less power, which at $0.07/kWh saves ~$49 per year in electricity.

Can both the Bitmain Antminer S21 Pro and Canaan Avalon A1566 mine the same coins?

Yes — both units can mine Bitcoin (BTC) and Bitcoin Cash (BCH). You can switch between these coins with a simple pool configuration change.

Which unit has a better ROI?

ROI depends on hardware acquisition price, electricity cost, and coin price trajectory. The more efficient unit (better J/TH or hashrate per watt) will generally have a lower operating cost per coin mined, but the absolute ROI timeline is determined by the purchase price. Always model both units in the MiningReturns calculator with your specific electricity rate and current market prices.

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