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MicroBT Whatsminer M21 (31 TH/s)
Outdated · MicroBT · Air-cooled · SHA-256
The MicroBT Whatsminer M21 (31 TH/s) is a air-cooled SHA-256 bitcoin ASIC miner from MicroBT released in Mar 2019. It runs at 31 TH/s while drawing 1,860 W, an efficiency of 60 J/TH. It is more than five years old and no longer competitive; the figures below are kept for reference.
More on this machine: MicroBT Whatsminer M21 profitability history
MicroBT Whatsminer M21 profitability
As of Sep 21, 2026, hosted in Argentina at 6.0¢/kWh with 98.7% uptime. Bitcoin $87,031.
| Period | Bitcoin mined | Revenue | Electricity | Profit |
|---|---|---|---|---|
| Daily | 0.000015 BTC | $1.28 | $2.78 | -$1.50 |
| Weekly | 0.000103 BTC | $8.93 | $19.43 | -$10.50 |
| Monthly | 0.000446 BTC | $38.80 | $84.44 | -$45.64 |
| Yearly | 0.005349 BTC | $465.53 | $1,013.15 | -$547.63 |
Electricity per bitcoin mined: $189,410.
Where to host the MicroBT Whatsminer M21
| Site | Cooling | Rate | Uptime | Cost per BTC | Profit per month | All-in per unit | Year 1 return |
|---|---|---|---|---|---|---|---|
| UAE | Immersion | 6.0¢ | 99.3% | $189,410 | -$46 | — | — |
| Nigeria | Air-cooled | 3.9¢ | 73.6% | $123,117 | -$12 | — | — |
| Argentina | Air-cooled | 6.0¢ | 98.7% | $189,410 | -$46 | — | — |
MicroBT Whatsminer M21 specifications
| Specification | Value |
|---|---|
| Manufacturer | MicroBT |
| Model | MicroBT Whatsminer M21 |
| Release date | Mar 2019 |
| Algorithm | SHA-256 |
| Hashrate | 31 TH/s |
| Power consumption | 1860 W |
| Efficiency | 60 J/TH |
| Cooling | Air-cooled |
| Weight | 7.1 kg (approx.) |
MicroBT Whatsminer M21 FAQ
Can I buy the MicroBT Whatsminer M21?
The MicroBT Whatsminer M21 is outdated. Newer models make bitcoin far more cheaply.
Is the MicroBT Whatsminer M21 (31 TH/s) profitable?
As of Sep 21, 2026, hosted in Argentina at 6.0¢/kWh, the MicroBT Whatsminer M21 (31 TH/s) is calculated to lose $1.50 daily, $45.64 monthly and $547.63 yearly after electricity, at a bitcoin price of $87,031. It always changes with bitcoin's price and network difficulty.
What does it cost to mine one bitcoin with the MicroBT Whatsminer M21?
Electricity to mine one bitcoin with the MicroBT Whatsminer M21 costs about $189,410 in Argentina, and $189,410 in UAE and $123,117 in Nigeria. Bitcoin trades at $87,031, so every coin it mines is made above the price of buying one.
What is the hashrate and power consumption of the MicroBT Whatsminer M21?
The MicroBT Whatsminer M21 produces 31 TH/s of SHA-256 hashrate and consumes 1,860 W, giving an efficiency of 60 J/TH.
What are the dimensions and weight of the MicroBT Whatsminer M21?
The MicroBT Whatsminer M21 measures about n/a and weighs around 7.1 kg.
Is the MicroBT Whatsminer M21 air-cooled or hydro-cooled?
The MicroBT Whatsminer M21 is air-cooled with fans. In the UAE we run air-cooled machines in immersion tanks instead, which keeps them cool in desert heat.
Where can the MicroBT Whatsminer M21 be hosted?
We can host the MicroBT Whatsminer M21 in UAE (6.0¢/kWh, 99.3% uptime, immersion), Nigeria (3.9¢/kWh, 73.6% uptime) and Argentina (6.0¢/kWh, 98.7% uptime). The bitcoin it mines goes straight to your own wallet.
When was the MicroBT Whatsminer M21 released?
MicroBT announced the MicroBT Whatsminer M21 in Mar 2019.