Antminer S21+ vs Bitaxe Ultra
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21+ | Specification | Bitaxe Ultra |
|---|---|---|
| 216.0 TH/s | Hashrate | 500.0 GH/s |
| 3,564 W | Power Consumption | 15 W |
| 16.5 J/TH | Efficiency | 30.0 J/TH |
| 75 dB | Noise Level | 35 dB |
| 15.0 kg | Weight | 0.3 kg |
| 12,160 BTU/hr | BTU Output | 51 BTU/hr |
| 30/100 | Home Mining Score | 70/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | D-Central |
Profitability Comparison
Antminer S21+
Bitaxe Ultra
Based on BTC price of $75,864 and current network difficulty as of Apr 21, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the Antminer S21+ wins on 3 of 6 factors (efficiency, hashrate, price-performance). The Bitaxe Ultra holds the edge in power consumption and home mining score and noise level. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Best For...
Best for Profitability
TieBoth miners produce similar daily profit.
Best for Home Mining
Bitaxe UltraScore: 70/100. 35 dB noise level.
Best for Efficiency
Antminer S21+16.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21+ or Bitaxe Ultra more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the Bitaxe Ultra is more profitable at $-0.02/day compared to $-0.96/day for the Antminer S21+. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21+ or Bitaxe Ultra?
The Bitaxe Ultra is quieter at 35 dB compared to the Antminer S21+ at 75 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer S21+ or Bitaxe Ultra?
The Bitaxe Ultra scores 70/100 on our Home Mining Score (vs 30/100 for the Antminer S21+). 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+ and Bitaxe Ultra?
The Antminer S21+ runs at 16.5 J/TH while the Bitaxe Ultra runs at 30.0 J/TH — a difference of 13.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.