Bitmain Antminer S21+ Hyd vs MicroBT Whatsminer M31S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21+ Hyd | Specification | MicroBT Whatsminer M31S |
|---|---|---|
| 319.0 TH/s | Taux de hachage | 76.0 TH/s |
| 4,785 W | Consommation électrique | 3,220 W |
| 15.0 J/TH | Efficiency | 42.4 J/TH |
| 50 dB | Niveau de bruit | — |
| 17.5 kg | Weight | 12,500.0 kg |
| 16,326 BTU/hr | BTU Output | 10,987 BTU/hr |
| 44/100 | Home Mining Score | 22/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Bitmain Antminer S21+ Hyd
MicroBT Whatsminer M31S
Based on BTC price of $78,235 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the Bitmain Antminer S21+ Hyd, which leads on 4 of 6 weighted factors (efficacité, hashrate, score de minage domestique, niveau sonore). Its biggest concrete edge: 320% more hashrate (319.0 vs 76.0 TH/s). That said, the MicroBT Whatsminer M31S isn't beaten everywhere — it still wins consommation électrique and rapport qualité-prix. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
Stripped to the numbers, this is how far apart the Bitmain Antminer S21+ Hyd and MicroBT Whatsminer M31S sit on each measurable spec:
- Bitmain Antminer S21+ Hyd 320% more hashrate (319.0 vs 76.0 TH/s)
- MicroBT Whatsminer M31S 33% better power draw (4,785 vs 3,220 W)
- Bitmain Antminer S21+ Hyd 65% better efficacité (15.0 vs 42.4 J/TH)
- Bitmain Antminer S21+ Hyd 100% better weight (17.5 vs 12,500.0 kg)
- Bitmain Antminer S21+ Hyd 49% more heat output (16,326 vs 10,987 BTU/hr)
- Bitmain Antminer S21+ Hyd 100% more score de minage domestique (44.0 vs 22.0)
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.
| Bitmain Antminer S21+ Hyd | Metric | MicroBT Whatsminer M31S |
|---|---|---|
| $2,499 | Upfront cost (MSRP) | $91 |
| $0.00 | Daily net profit | -$4.99 |
| -$2,499 | Net after 1 year | -$1,913 |
| -$2,498 | Net after 2 years | -$3,735 |
| -$2,498 | Net after 3 years | -$5,557 |
| Takes ~8,833.6 years to pay back at current rates | Payback period | Does not pay back at current rates (negative daily profit) |
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+ Hyd$4.99/day higher profit at current rates.
Best for Home Mining
Bitmain Antminer S21+ HydScore: 44/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21+ Hyd15.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer S21+ Hyd vs MicroBT Whatsminer M31S: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21+ Hyd is more profitable at $0.00/day compared to $-4.99/day for the MicroBT Whatsminer M31S. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Is the Bitmain Antminer S21+ Hyd or the MicroBT Whatsminer M31S better for noise-sensitive spaces?
The Bitmain Antminer S21+ Hyd is quieter at 50 dB compared to the MicroBT Whatsminer M31S 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+ Hyd or MicroBT Whatsminer M31S?
The Bitmain Antminer S21+ Hyd scores 44/100 on our Home Mining Score (vs 22/100 for the MicroBT Whatsminer M31S). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
How far apart are the Bitmain Antminer S21+ Hyd and MicroBT Whatsminer M31S on J/TH?
The Bitmain Antminer S21+ Hyd runs at 15.0 J/TH while the MicroBT Whatsminer M31S runs at 42.4 J/TH — a difference of 27.4 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 65% better efficacité (15.0 vs 42.4 J/TH).
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