Coinovo · Miners · Antminer S21 Pro
Antminer S21 Pro
234 TH/s at 3,510 watts. 15.0 J/TH, which is rank 37 of 85 in this comparison.
What this machine earns at your electricity price
Further assumptions
Network hashrate 973 EH/s ·
Household prices per Eurostat, 2. Halbjahr 2025, including all taxes and levies. Your own tariff may differ considerably; cheap switching offers often sit ten cents below. Just type yours in.
The break-even electricity price is the price per kilowatt-hour at which earnings exactly cover the power bill. Below it the machine earns, above it the machine burns money. In central Europe that is the number almost everything turns on.
The sum behind it
Not included: connection, cooling, power-supply losses, downtime and maintenance. Water cooling adds the loop itself, hosting adds the slot fee. Network difficulty rises over the long run, which lowers earnings at the same hashrate; the payback figure uses today's values and is therefore on the optimistic side.
Specifications
Assessment
The S21 Pro is the most searched-for machine on this list, and with good reason: 15 J/TH on air cooling was the peak when it launched, and the figure still holds up. Air cooling means no water loop to build, which makes it equally workable for a small home setup and for hosting. The price per terahash, though, is well above a T21 or an S21+, so you pay for the efficiency in full. With expensive power that pays off, with cheap power it does not. That is exactly what the panel above works out.
Against machines of similar efficiency
| Model | TH/s | J/TH | Net/day | Break-even | Price |
|---|---|---|---|---|---|
| SealMiner A2 Pro Hyd | 500 | 14.9 | – | – | — |
| SealMiner A2 Pro Air | 260 | 14.9 | – | – | — |
| SealMiner A3 Pro | 660 | 15.0 | – | – | 8,278 € |
| Bitaxe Gamma 601 | 1.2 | 15.0 | – | – | 173 € |
| Antminer S21+ Hyd | 338 | 15.0 | – | – | — |
| Antminer S21 Pro+ | 245 | 15.0 | – | – | — |
| Antminer S21 Pro | 234 | 15.0 | – | – | 4,792 € |
Do the sums before you buy
If you do not like the numbers, you are not alone: at household prices almost none of these machines pay off in central Europe. If you still want to understand how mining works economically, you can play it through in the Coinovo app, with the same models and the same formulas, but without hardware and without a power bill.
Open Coinovo