Bitcoin Space Heater S9 Edition vs MicroBT Whatsminer M21
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitcoin Space Heater S9 Edition | Specification | MicroBT Whatsminer M21 |
|---|---|---|
| 12.0 TH/s | Taux de hachage | 31.0 TH/s |
| 1,100 W | Consommation électrique | 1,860 W |
| 91.7 J/TH | Efficiency | 60.0 J/TH |
| 50 dB | Niveau de bruit | — |
| 8.0 kg | Weight | 7,150.0 kg |
| 3,753 BTU/hr | BTU Output | 6,346 BTU/hr |
| 59/100 | Home Mining Score | 28/100 |
| — | Release Year | — |
| SHA-256 | Algorithme | SHA-256 |
| D-Central | Manufacturer | MicroBT |
Profitability Comparison
Bitcoin Space Heater S9 Edition
MicroBT Whatsminer M21
Based on BTC price of $78,179 and current network difficulty as of May 17, 2026. Actual results vary.
Verdict
Weighing six performance factors, the MicroBT Whatsminer M21 comes out ahead — it takes 2 of 5 (efficacité, hashrate). Where it pulls away hardest is 158% more hashrate (12.0 vs 31.0 TH/s). That said, the Bitcoin Space Heater S9 Edition isn't beaten everywhere — it still wins consommation électrique and score de minage domestique and niveau sonore. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
The Bitcoin Space Heater S9 Edition and MicroBT Whatsminer M21 diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- MicroBT Whatsminer M21 158% more hashrate (12.0 vs 31.0 TH/s)
- Bitcoin Space Heater S9 Edition 41% better power draw (1,100 vs 1,860 W)
- MicroBT Whatsminer M21 35% better efficacité (91.7 vs 60.0 J/TH)
- Bitcoin Space Heater S9 Edition 100% better weight (8.0 vs 7,150.0 kg)
- MicroBT Whatsminer M21 69% more heat output (3,753 vs 6,346 BTU/hr)
- Bitcoin Space Heater S9 Edition 111% more score de minage domestique (59.0 vs 28.0)
Cost & ROI Over Time
A miner pays for itself in profit, not specs. These projections track upfront cost against one, two and three years of net earnings at $0.10/kWh.
| Bitcoin Space Heater S9 Edition | Metric | MicroBT Whatsminer M21 |
|---|---|---|
| $499 | Upfront cost (MSRP) | — |
| -$2.21 | Daily net profit | -$3.35 |
| -$1,305 | Net after 1 year | -$1,222 |
| -$2,111 | Net after 2 years | -$2,445 |
| -$2,917 | Net after 3 years | -$3,667 |
| Does not pay back at current rates (negative daily profit) | Payback period | — |
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
Bitcoin Space Heater S9 EditionScore: 59/100. 50 dB noise level.
Best for Efficiency
MicroBT Whatsminer M2160.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitcoin Space Heater S9 Edition vs MicroBT Whatsminer M21: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitcoin Space Heater S9 Edition is more profitable at $-2.21/day compared to $-3.35/day for the MicroBT Whatsminer M21. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Bitcoin Space Heater S9 Edition vs MicroBT Whatsminer M21: which runs at a lower noise level?
The Bitcoin Space Heater S9 Edition is quieter at 50 dB compared to the MicroBT Whatsminer M21 at 0 dB. For home mining, lower noise levels make a significant difference in livability.
For mining at home, should I pick the Bitcoin Space Heater S9 Edition or the MicroBT Whatsminer M21?
The Bitcoin Space Heater S9 Edition scores 59/100 on our Home Mining Score (vs 28/100 for the MicroBT Whatsminer M21). 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 Bitcoin Space Heater S9 Edition and MicroBT Whatsminer M21?
The Bitcoin Space Heater S9 Edition runs at 91.7 J/TH while the MicroBT Whatsminer M21 runs at 60.0 J/TH — a difference of 31.7 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 35% better efficacité (91.7 vs 60.0 J/TH).
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