The Bitmain Antminer S21 XP is the flagship of the S21 lineup and one of the most efficient air-cooled Bitcoin miners ever produced. At 270 TH/s and 13.5 J/TH, the S21 XP represents the absolute cutting edge of SHA-256 mining silicon — delivering more hashrate per watt than any standard Antminer before it.
For operations where electricity cost is the primary constraint, the S21 XP is the machine that changes the math. It remains profitable at electricity rates that would render older-generation miners completely unviable, making it the weapon of choice for miners competing in high-cost jurisdictions or seeking maximum efficiency at scale.
Antminer S21 XP Full Specifications
| Specification | Details |
|---|---|
| Manufacturer | Bitmain |
| Model | Antminer S21 XP |
| Algorithm | SHA-256 |
| Hashrate | 270 TH/s |
| Power Consumption | 3,645W (±5%) |
| Efficiency | 13.5 J/TH |
| Noise Level | 75 dB |
| Weight | 15.4 kg |
| Dimensions | 400 x 195 x 290 mm |
| Operating Temperature | 5-45 °C |
| Cooling | 4 x high-speed fans (air-cooled) |
| ASIC Chip | BM1370 |
| Chip Count | ~396 |
| Input Voltage | 220-277V AC |
| Network Connection | Ethernet (RJ45) |
| Release Date | 2025 |
Performance Analysis
The S21 XP’s 13.5 J/TH efficiency is a 23% improvement over the standard Antminer S21 (17.5 J/TH) and a 10% improvement over the S21 Pro (15 J/TH). At 270 TH/s, it also delivers 35% more hashrate than the base S21, all within the same physical form factor.
Against the broader market, the S21 XP outclasses everything in the S19 generation by a wide margin. The S19 XP at 21.5 J/TH and 140 TH/s is nearly half the hashrate at 60% worse efficiency. The Whatsminer M60S at 18.5 J/TH and 186 TH/s does not come close.
The S21 XP currently sits at or near the top of any efficiency ranking for production air-cooled miners. For the complete picture, see our Most Efficient Bitcoin Miners 2026 guide.
Profitability Snapshot
Estimated daily revenue and cost at current network difficulty (approximate, based on typical 2026 conditions). Actual results depend on Bitcoin price, network difficulty, and pool fees.
| Electricity Rate | Daily Power Cost | Monthly Power Cost | Viability |
|---|---|---|---|
| $0.05/kWh | $4.37 | $131 | Highly profitable — maximum efficiency extracts every sat from cheap power |
| $0.08/kWh | $7.00 | $210 | Profitable — strong margins even at average North American rates |
| $0.10/kWh | $8.75 | $263 | Profitable — the 13.5 J/TH efficiency keeps this machine viable at higher rates |
| $0.12/kWh | $10.49 | $315 | Marginal but viable — still operational where every other air-cooled miner bleeds money |
Use our Bitcoin Mining Profitability Calculator for real-time estimates with your exact electricity rate, or check our Bitcoin Mining Electricity Cost by State & Province guide to find your local rate.
Best Use Cases
Large-Scale Mining Farms: The S21 XP was designed for industrial deployment. At 270 TH/s per unit, it offers the highest hashrate density of any standard Antminer, reducing the number of units (and rack space, cabling, and management overhead) needed to reach your target hashrate.
High-Cost Electricity Regions: The 13.5 J/TH efficiency is the S21 XP’s defining advantage. In jurisdictions where electricity costs $0.08-0.12/kWh, this machine remains profitable while S19-class miners are forced offline. If your electricity rate is your biggest constraint, the S21 XP is the answer.
Home Mining (Advanced Setup): At 3,645W and 75 dB, the S21 XP demands a dedicated circuit (220V+), proper ventilation, and sound isolation. For experienced home miners with the infrastructure in place, it delivers unmatched efficiency. Use a D-Central cooling shroud to capture and redirect waste heat.
Dual-Purpose Heating: The S21 XP generates approximately 12,437 BTU/h of heat — a substantial heating source. Canadian miners running this machine through winter months effectively get free heating while mining at peak efficiency. See our Bitcoin Space Heater vs Electric Heater analysis.
Compatible Firmware
| Firmware | Compatibility | Key Features |
|---|---|---|
| Stock (Bitmain) | Full support | Default firmware, basic configuration |
| Braiins OS+ | Supported | Autotuning, Stratum V2, power capping, remote management |
| Vnish | Supported | Advanced overclocking, custom profiles, immersion mode |
| LuxOS | Supported | Curtailment features, fleet management, API access |
For detailed installation instructions, see our guides:
- Antminer Firmware Compatibility Matrix 2026
- Braiins OS+ Setup & Configuration Guide
- Vnish Firmware Guide
- LuxOS Firmware Guide
- Antminer Firmware Update Guide
Common Issues & Repair
Common issues with the Antminer S21 XP include:
- Hashboard failures: With approximately 396 BM1370 chips across three hashboards, individual chip failures can reduce output. The higher chip density means thermal management is critical.
- Fan errors: High fan speeds are required to cool the increased chip count. Fan failures trigger protective shutdown. Compatible replacement fans are available.
- Temperature warnings: The XP runs at higher thermal loads than the standard S21. Ensure ambient temperatures stay well within the 5-45 degrees C range and maintain unobstructed airflow.
- Power delivery: At 3,645W, the XP pushes power supply limits. Use only high-quality, properly rated PSUs and circuits.
D-Central offers professional Antminer S21 XP Repair services from our Canadian workshop. We diagnose and repair hashboard, control board, PSU, and fan issues with fast turnaround. See our ASIC Repair Cost Estimator for pricing.
Where to Buy
D-Central stocks the Antminer S21 XP and ships across Canada and internationally. Buy the Antminer S21 XP from D-Central — backed by our technical support team, repair services, and full parts inventory including S21 XP shroud adapters and cooling accessories.