MicroBT Whatsminer M21 vs MicroBT Whatsminer M31S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| MicroBT Whatsminer M21 | Specification | MicroBT Whatsminer M31S |
|---|---|---|
| 31.0 TH/s | Taux de hachage | 76.0 TH/s |
| 1,860 W | Consommation électrique | 3,220 W |
| 60.0 J/TH | Efficiency | 42.4 J/TH |
| — | Niveau de bruit | — |
| 7.2 kg | Weight | 12.5 kg |
| 6,346 BTU/hr | BTU Output | 10,987 BTU/hr |
| 28/100 | Home Mining Score | 22/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| MicroBT | Manufacturer | MicroBT |
Profitability Comparison
MicroBT Whatsminer M21
MicroBT Whatsminer M31S
Based on BTC price of $64,340 and current network difficulty as of Jun 4, 2026. Actual results vary.
Verdict
Our scoring model gives the nod to the MicroBT Whatsminer M31S, which leads on 2 of 4 weighted factors (efficacité, hashrate). Where it pulls away hardest is 145% more hashrate (31.0 vs 76.0 TH/s). The MicroBT Whatsminer M21 claws back ground on consommation électrique and score de minage domestique. The right pick still depends on your power cost and noise tolerance — the breakdowns above make that call concrete.
Spec Deltas
Stripped to the numbers, this is how far apart the MicroBT Whatsminer M21 and MicroBT Whatsminer M31S sit on each measurable spec:
- MicroBT Whatsminer M31S 145% more hashrate (31.0 vs 76.0 TH/s)
- MicroBT Whatsminer M21 42% better power draw (1,860 vs 3,220 W)
- MicroBT Whatsminer M31S 29% better efficacité (60.0 vs 42.4 J/TH)
- MicroBT Whatsminer M21 42% better weight (7.2 vs 12.5 kg)
- MicroBT Whatsminer M31S 73% more heat output (6,346 vs 10,987 BTU/hr)
- MicroBT Whatsminer M21 27% more score de minage domestique (28.0 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.
| MicroBT Whatsminer M21 | Metric | MicroBT Whatsminer M31S |
|---|---|---|
| — | Upfront cost (MSRP) | $91 |
| -$3.56 | Daily net profit | -$5.52 |
| -$1,300 | Net after 1 year | -$2,104 |
| -$2,600 | Net after 2 years | -$4,118 |
| -$3,900 | Net after 3 years | -$6,131 |
| — | 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
TieBoth miners produce similar daily profit.
Best for Home Mining
MicroBT Whatsminer M21Score: 28/100. 0 dB noise level.
Best for Efficiency
MicroBT Whatsminer M31S42.4 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
MicroBT Whatsminer M21 vs MicroBT Whatsminer M31S: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT Whatsminer M21 is more profitable at $-3.56/day compared to $-5.52/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 MicroBT Whatsminer M21 or the MicroBT Whatsminer M31S better for noise-sensitive spaces?
Both miners have similar noise levels. Check the specs table above for exact decibel readings.
Which is better for home mining, the MicroBT Whatsminer M21 or MicroBT Whatsminer M31S?
The MicroBT Whatsminer M21 scores 28/100 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 MicroBT Whatsminer M21 and MicroBT Whatsminer M31S on J/TH?
The MicroBT Whatsminer M21 runs at 60.0 J/TH while the MicroBT Whatsminer M31S runs at 42.4 J/TH — a difference of 17.6 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 29% better efficacité (60.0 vs 42.4 J/TH).