If you're shopping for one of the most efficient air-cooled Bitcoin miners on the market right now, the Bitmain Antminer S21 XP is the unit you're comparing everything else against. Released in September 2024, it's Bitmain's flagship air-cooled ASIC for the SHA-256 algorithm, built specifically for Bitcoin (BTC) mining at the kind of hashrate density older models can't match.
Here's what makes this miner stand out. You get 270 TH/s of hashrate while drawing 3,645W from the wall, which works out to 13.5 J/TH efficiency. In plain English: you're producing more bitcoin per kilowatt-hour than almost anything else in this air-cooled class. If you're paying anywhere above $0.06/kWh, that efficiency gap compounds into real dollars over a year of uptime.
The S21 XP is built for serious operators, farm setups, hosted mining, and professional buyers running multiple units. Bitmain has refined the thermal design and component quality enough that you can rack a unit, plug it in, and let it run for months without touching it. If you're currently mining on S19s or earlier S21s, the upgrade math here is hard to argue with.
Order direct from The Miner Island with free DDP shipping on orders over $5,000, and save 3% when you pay in Bitcoin. Every unit is tested for hashrate stability before it ships from our Hong Kong warehouse, no surprises at unboxing.
| Algorithm | SHA-256 |
|---|---|
| Hashrate | 270 TH/s ±5% |
| Power Consumption | 3645 W ±5% |
| Efficiency | 13.5 J/TH |
| Noise Level | 75 dB |
| Dimensions | 400 × 195 × 290 mm |
| Weight | ~17.5 kg |
| Interface | Ethernet 10/100M |
| Temprature | 5 – 45 °C |
| Humidity | 5 – 95% (non-condensing) |
Every order over $5,000 ships DDP-paid from our Hong Kong warehouse, so duties, taxes, and customs clearance are paid before the unit reaches you. You won't get a surprise invoice from the courier on delivery day.
Most orders dispatch within 24 to 72 hours of payment confirmation. Transit time runs 3 to 7 business days to North America, Europe, and the major mining jurisdictions. We share the tracking number the moment the airwaybill is issued.
Every unit carries a 60-day warranty from the date you receive it. Manufacturer warranties (typically 180 to 365 days depending on the brand) run in parallel and we'll help you process those claims directly with Bitmain, MicroBT, Canaan, Goldshell, IceRiver, or Elphapex.
If your unit arrives dead-on-arrival (won't power on, fails the initial hashrate test, or has visible transit damage), we replace it. Document the issue within 72 hours of delivery (a short video or photo set is enough), and we'll ship the replacement.
We accept Bitcoin, Ethereum, Litecoin, USDT, USDC, and a handful of other major cryptos through Plisio. Pay in any crypto and save 3% on your entire order. The discount applies automatically at checkout. For bulk orders over $25,000, message us on WhatsApp to discuss 50/50 staged crypto payment options.
Live estimate based on this unit's hashrate, efficiency, and coin price.
Network difficulty, coin price, and uptime all move. Treat this as a sanity-check, not a guarantee. Baseline issuance data is calibrated to May 2026; numbers drift as networks evolve. We're happy to walk through your specific power cost and target hashrate on WhatsApp.
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Pay in BTC, save 3%
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Pay in BTC, save 3%
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Pay in BTC, save 3%
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Pay in BTC, save 3%
