Antminer S21 Hydro vs Bitmain Antminer S21 XP+ Hyd (500Th)
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Hydro | Specification | Bitmain Antminer S21 XP+ Hyd (500Th) |
|---|---|---|
| 335.0 TH/s | Hashrate | 500.0 TH/s |
| 5,360 W | Power Consumption | 5,500 W |
| 16.0 J/TH | Efficiency | 11.0 J/TH |
| 50 dB | Noise Level | 50 dB |
| 15.8 kg | Weight | 13.8 kg |
| 18,288 BTU/hr | BTU Output | 18,766 BTU/hr |
| 44/100 | Home Mining Score | 44/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S21 Hydro
Bitmain Antminer S21 XP+ Hyd (500Th)
Based on BTC price of $79,161 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer S21 XP+ Hyd (500Th) comes out ahead — it takes 3 of 4 (efficiency, hashrate, price-performance). The standout gap is 49% more hashrate (335 vs 500 TH/s) in the Bitmain Antminer S21 XP+ Hyd (500Th)'s favour. The Antminer S21 Hydro holds the edge in power consumption. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
The Antminer S21 Hydro and Bitmain Antminer S21 XP+ Hyd (500Th) diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitmain Antminer S21 XP+ Hyd (500Th) 49% more hashrate (335 vs 500 TH/s)
- Antminer S21 Hydro 3% better power draw (5,360 vs 5,500 W)
- Bitmain Antminer S21 XP+ Hyd (500Th) 31% better efficiency (16.0 vs 11.0 J/TH)
- Bitmain Antminer S21 XP+ Hyd (500Th) 13% better weight (15.8 vs 13.8 kg)
- Bitmain Antminer S21 XP+ Hyd (500Th) 3% more heat output (18,288 vs 18,766 BTU/hr)
Cost & ROI Over Time
Hardware cost is only half the story — here is how each miner's upfront price plays out against cumulative profit at a $0.10/kWh rate.
| Antminer S21 Hydro | Metric | Bitmain Antminer S21 XP+ Hyd (500Th) |
|---|---|---|
| $9,500 | Upfront cost (MSRP) | $9,125 |
| -$0.28 | Daily net profit | $5.58 |
| -$9,602 | Net after 1 year | -$7,087 |
| -$9,704 | Net after 2 years | -$5,049 |
| -$9,806 | Net after 3 years | -$3,011 |
| Does not pay back at current rates (negative daily profit) | Payback period | Takes ~4.5 years to pay back at current rates |
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 (500Th)$5.86/day higher profit at current rates.
Best for Home Mining
TieBoth miners are equally suitable for home use.
Best for Efficiency
Bitmain Antminer S21 XP+ Hyd (500Th)11.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Which makes more money, the Antminer S21 Hydro or the Bitmain Antminer S21 XP+ Hyd (500Th)?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 XP+ Hyd (500Th) is more profitable at $5.58/day compared to $-0.28/day for the Antminer S21 Hydro. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the Antminer S21 Hydro or the Bitmain Antminer S21 XP+ Hyd (500Th) better for noise-sensitive spaces?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Antminer S21 Hydro vs Bitmain Antminer S21 XP+ Hyd (500Th): 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.
Antminer S21 Hydro vs Bitmain Antminer S21 XP+ Hyd (500Th): how much does the efficiency gap matter?
The Antminer S21 Hydro runs at 16.0 J/TH while the Bitmain Antminer S21 XP+ Hyd (500Th) runs at 11.0 J/TH — a difference of 5.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 31% better efficiency (16.0 vs 11.0 J/TH).
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