Description
Overview
The Bitmain Antminer S21 represents the current pinnacle of SHA-256 ASIC mining technology. Delivering an impressive hashrate with industry-leading power efficiency, the S21 is built for serious miners who demand maximum performance per watt. Every unit sold by D-Central Technologies is tested and verified by our in-house ASIC repair team before shipping from Canada.
Specifications
| Specification | Value |
|---|---|
| Algorithm | SHA-256 |
| Hashrate | 200 TH/s |
| Power Consumption | 3,550W (at wall) |
| Efficiency | 17.5 J/TH |
| Noise Level | 75 dB |
| Cooling | 4x 12038 fans, front-to-back airflow |
| Dimensions | 200 x 290 x 370 mm |
| Weight | 14.2 kg |
| Power Input | 220-240V AC (dedicated circuit required) |
| Network | Ethernet (RJ45) |
| SKU | DC-MINER-S21 |
Key Features
- Industry-leading efficiency — 17.5 J/TH makes the S21 one of the most power-efficient SHA-256 miners available, directly impacting your profitability
- 200 TH/s hashrate — significant hashing power for competitive Bitcoin mining revenue
- Next-generation ASIC chip — Bitmain latest 5nm chip design for maximum performance per watt
- Pre-tested by D-Central — full diagnostic check including hashboard verification, thermal testing, and burn-in before shipping
- Professional-grade build quality — designed for continuous 24/7 operation in mining facilities or home setups with proper infrastructure
- Backed by D-Central repair support — if anything goes wrong, our ASIC repair team with 8+ years experience has you covered
Installation Requirements
The Antminer S21 is professional mining hardware that requires proper infrastructure:
- Power: Dedicated 220-240V circuit with appropriate breaker capacity. PSU sold separately (Bitmain APW series recommended)
- Cooling: Adequate ventilation is essential. The S21 produces approximately 12,100 BTU/hr of heat. A garage, basement, or dedicated mining room with exhaust ducting is recommended
- Noise: At 75 dB, the S21 is not suitable for living spaces without an acoustic enclosure or shroud. Consider our universal ASIC shrouds for noise reduction
- Network: Wired Ethernet connection to your router. Configure via the built-in web interface
Profitability Considerations
Mining profitability depends on your electricity cost, Bitcoin price, and network difficulty. Use our Mining Profitability Calculator to estimate your daily revenue based on current market conditions. At 17.5 J/TH, the S21 is optimized for regions with electricity costs under $0.10/kWh. Canadian miners benefit from some of the lowest energy rates in North America, especially in Quebec where hydroelectric power is abundant.
What PSU does the Antminer S21 require?
The S21 requires a PSU capable of delivering at least 3,550W at 220-240V. The Bitmain APW12 or APW17 series is recommended. The PSU is not included and must be purchased separately. D-Central stocks compatible power supplies.
Can I run the Antminer S21 at home?
Yes, with proper preparation. You need a dedicated 220V circuit, adequate ventilation for the heat output (approximately 12,100 BTU/hr), and a noise management solution. Many D-Central customers run S21 units in garages, basements, or with shroud/ducting systems. Consider our Bitcoin Space Heater options if you want to capture the heat for home heating.
Is this unit new or refurbished?
Check the current listing status above for condition details. All units sold by D-Central are tested by our ASIC repair technicians, including full hashboard diagnostics and thermal verification, before shipping.
What if my Antminer S21 needs repairs?
D-Central operates one of the largest ASIC repair facilities in Canada, located in Laval, Quebec. Our technicians have been repairing Bitmain ASICs since 2016 and can diagnose and repair hashboard-level issues. Visit our ASIC Repair page for details.
Does D-Central offer mining hosting for the S21?
Yes. D-Central offers mining hosting at our facility in Quebec, Canada, powered by renewable hydroelectric energy. Contact us for current hosting rates and availability.
Why Buy From D-Central?
D-Central Technologies has been in Bitcoin mining since 2016. We are not just a reseller — we operate repair facilities, hosting infrastructure, and have deep expertise in every ASIC we sell. Every Antminer S21 is tested by our technicians before shipping from Canada. If it ever needs service, we have the team and parts to get it running again.
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