Technical Specifications
| Hashrate | 270 TH/s |
|---|---|
| Power Consumption | 3,245 W |
| Efficiency | 12 J/TH |
| Algorithm | SHA-256 |
| Mineable Coins | Bitcoin , Bitcoin Cash |
| Noise Level | 75 dB(A) |
| Cooling | Air — 4 fans |
| Dimensions | 400 × 195 × 290 mm |
| Weight | 14.8 kg |
| Release | 2024-Q3 |
| Approx. Price | ~$6,500 USD |
Mining Profitability in 2026
The Bitmain Antminer S21 XP can be pointed at different algorithms and coins. Use our individual coin calculators with the hashrates listed in the table above:
Break-even tip: Enter the approximate price of this unit (~$6,500) in the hardware cost field of the calculator to see your estimated days-to-break-even based on current network conditions.
Pros & Cons
Pros
- Best efficiency among air-cooled SHA-256 ASICs (12 J/TH)
- 270 TH/s — highest hashrate in the S21 air-cooled lineup
- Standard air-cooled form factor: no special infrastructure needed beyond dedicated power
Cons
- Highest acquisition cost in the S21 air-cooled range (~$6,000–$7,500)
- 3,245 W still requires a dedicated 16 A / 220 V circuit
- Price premium over S21 Pro narrows at lower BTC prices
Frequently Asked Questions
What is the difference between the Antminer S21 XP and S21 Pro?
The S21 XP is Bitmain's most efficient air-cooled SHA-256 ASIC — 270 TH/s at 12 J/TH versus the S21 Pro's 234 TH/s at 15 J/TH. The XP delivers 15% more hashrate and 20% better efficiency, at a ~40–50% price premium. For long-term operators focused on electricity economics, the XP's efficiency advantage compounds significantly over months of continuous operation.
Is the Antminer S21 XP profitable in 2026?
At electricity rates below $0.08/kWh, the S21 XP is one of the most resilient Bitcoin miners available in 2026 — its 12 J/TH efficiency means it remains profitable at lower BTC prices than any other air-cooled miner in its class. Use our Bitcoin mining calculator with 270 TH/s and 3,245 W to model current profitability at your electricity rate.
Is there a hydro-cooled version of the S21 XP?
Yes — the Antminer S21 XP Hyd is a water/hydro-cooled variant delivering 473 TH/s at approximately 5,676 W (~12 J/TH). The Hyd model requires a compatible liquid cooling distribution unit (LDU), making it suitable only for purpose-built hydro-cooling infrastructure. For most operators without existing liquid cooling, the standard air-cooled S21 XP is more practical.
How does the S21 XP compare to the Whatsminer M66S?
The S21 XP (270 TH/s at 12 J/TH) and M66S (298 TH/s at ~11.5 J/TH) are the two most efficient air-cooled SHA-256 ASICs available in 2026. The M66S edges ahead on raw hashrate and efficiency; the S21 XP benefits from Bitmain's wider reseller network and BOS+ firmware support. Both are excellent choices — compare pricing and availability before deciding.
Where to Buy
The Bitmain Antminer S21 XP is available from:
- Bitmain Official Shop — shop.bitmain.com (new units, with warranty)
- MinerBros — authorised reseller, ships globally
- Kaboomracks — US-based reseller, new and refurbished
- eBay / secondary market — used units, verify hashrate stability before purchasing
Price estimates on this page are approximate and subject to market fluctuations. Always compare prices from multiple sellers before purchasing.
Compare the Bitmain Antminer S21 XP
See how the Bitmain Antminer S21 XP stacks up against other miners that can mine the same coins — hashrate, power draw, efficiency, and profitability side by side: