SHA-256 · air-cooled
Air-cooled at 15 W/TH, which makes it far easier to deploy than the hydro models while staying competitive on efficiency. At 76 dB from four high-speed fans it is still far too loud for a home without a dedicated, isolated space.
Operating profit
$4.05
per day · 0.000110 BTC
Break-even electricity
$0.1081
per kWh · $0.0481 above your rate
Payback period
—
Enter a hardware cost to estimate payback
Revenue assumes a 1% pool fee at the current BTC price and network difficulty, with the machine running continuously. Payback needs a hardware cost, which we do not publish because we have no verified retailer feed — add your own purchase price in the calculator. Your rate is saved in this browser and applies across the site.
| Manufacturer | Bitmain |
|---|---|
| Model | Antminer S21 Pro |
| Algorithm | SHA-256 |
| Coins | Bitcoin |
| Hashrate | 234 TH/s |
| Power | 3,510 W |
| Efficiency | 15.0 W/TH |
| Cooling | Air |
| Type | ASIC |
| Released | 2024 |
| Home suitable | No — noise and power draw |
| Noise | 76 dB |
| Dimensions | 450 × 219 × 293 mm |
| Weight | 20 kg |
| Operating temperature | -20 to 45 °C |
| Warranty | 365 days |
Data provenance
Manufacturer datasheet as published by retailers; hashrate, power and efficiency corroborated across three independent sources. Last verified 2026-08-03.
Any field not listed above is one we could not verify for this machine. We would rather leave a row out than publish a figure you cannot check. Where published sources disagree, we say so instead of picking one. How we verify specifications.
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The miner's self-mining hashrate rose to 79.9 EH/s and production was up about 249 percent from a year earlier, but its bitcoin balance ended the month at 61 coins, against 257 a month earlier and 1,934 a year ago. The company's own footnote says the figure counts coins pledged as collateral, which rules out one explanation for the drop.
The Ways and Means Committee marked up H.R. 10357 on Wednesday morning, a day after the CLARITY Act stalled in the Senate. The bill waives tax on network fees of $10 or less from 2028, but settles only that staking and mining rewards are ordinary income, not when they are taxed.
Nearly 2.4 million ZEC took part, about two-thirds of the eligible supply, and 98.9 percent chose bitcoin-style halvings over a smoothed issuance curve. The result is advisory: NU7 still needs code, testing and a ZIP activation.
