Antminer S21
Too loud and power-hungry for home use without modifications
Professional-Grade Miner
This miner draws 3,500W and produces 75 dB of noise — it is designed for dedicated mining environments, not living spaces. Professional-grade miners deliver the highest hashrate and revenue per unit but require proper infrastructure: a 240V circuit, adequate ventilation or exhaust ducting, and a space where noise is not a concern (garage, basement, warehouse, or outdoor enclosure).
For home miners looking for a quieter alternative, consider our Bitcoin Space Heater builds or explore open-source miners like the Bitaxe that are purpose-built for residential environments.
Heater-Class Miner
At 3,500W, this miner outputs approximately 11942 BTU/hr of heat — equivalent to a standard electric space heater. Every watt consumed by an ASIC miner is converted to heat with 100% efficiency, making it a space heater that also mines Bitcoin.
During heating season, miner heat can offset part of the heat a room would otherwise need from another electric heater. The economics depend on your electricity rate, room heat demand, BTC price, network difficulty, and noise constraints.
Calculateur de rentabilité
| Period | Revenue | Electricity Cost | Profit |
|---|---|---|---|
| Daily | $5.69 | $5.88 | $-0.19 |
| Weekly | $39.86 | $41.16 | $-1.30 |
| Monthly | $170.84 | $176.40 | $-5.56 |
| Yearly | $2,078.54 | $2,146.20 | $-67.66 |
Heating offset estimates the value of heat replacing an electric space heater during heating season (~6 months/year in Canada). Actual savings depend on your heating setup and climate.
Buy from D-Central
Currently out of stock. Check back soon or contact us for availability.
Where to Buy the Antminer S21
D-Central Technologies
CanadaBitcoin Mining Hackers since 2016. Ships from Laval, Quebec.
Full Specifications
| Model | Antminer S21 |
| Model Number | S21 |
| Manufacturer | Bitmain |
| Algorithme | SHA-256 |
| Coins Mined | Bitcoin (BTC) |
| Taux de hachage | 200 TH/s |
| Consommation électrique | 3,500 W |
| Efficiency | 17.5 J/TH |
| Niveau de bruit | 75 dB |
| Chip Model | BM1368 |
| Chip Count | 132 |
| Cooling | Air |
| Voltage Range | 200-240V AC |
| Operating Temperature | 5-40°C |
| Dimensions | 400x195x290 |
| Weight | 14.6 |
| Interface | Ethernet |
| BTU Output | 11942 BTU/hr |
| Equivalent Heater | Equal to a 3,500W space heater |
| Daily Power Cost | $5.88/day |
| Monthly Power Cost | $176.40/mo |
| Circuit Requirement | 240V circuit required |
| Release Date | 2023-09-01 |
| MSRP | $5,500.00 |
| Status | Active |
Custom Power Profiles
With custom firmware like DCENT_OS, this miner can be tuned across a wide range of power levels. Lower wattage improves efficiency and reduces electricity costs; higher wattage increases hashrate at the expense of efficiency.
Normal Mode
| Wattage | Taux de hachage | Efficiency |
|---|---|---|
| 1,630 W | 92 TH/s | 17.7 J/TH |
| 1,960 W | 109 TH/s | 18 J/TH |
| 2,280 W | 127 TH/s | 18 J/TH |
| 2,610 W | 145 TH/s | 18 J/TH |
| 2,930 W | 163 TH/s | 18 J/TH |
| 3,250 W | 181 TH/s | 18 J/TH |
| 3,580 W | 199 TH/s | 18 J/TH |
| 3,880 W | 217 TH/s | 17.9 J/TH |
| 4,210 W | 235 TH/s | 17.9 J/TH |
| 4,530 W | 253 TH/s | 17.9 J/TH |
| 4,860 W | 271 TH/s | 17.9 J/TH |
| 5,180 W | 289 TH/s | 17.9 J/TH |
| 5,500 W | 307 TH/s | 17.9 J/TH |
| 5,830 W | 324 TH/s | 18 J/TH |
| 6,150 W | 342 TH/s | 18 J/TH |
| 6,480 W | 360 TH/s | 18 J/TH |
Performance Mode
| Wattage | Taux de hachage | Efficiency |
|---|---|---|
| 2,500 W | 148 TH/s | 16.9 J/TH |
| 2,900 W | 173 TH/s | 16.8 J/TH |
| 3,300 W | 197 TH/s | 16.8 J/TH |
| 3,620 W | 222 TH/s | 16.3 J/TH |
| 4,000 W | 247 TH/s | 16.2 J/TH |
| 4,370 W | 272 TH/s | 16.1 J/TH |
| 4,780 W | 297 TH/s | 16.1 J/TH |
| 5,360 W | 321 TH/s | 16.7 J/TH |
| 5,600 W | 346 TH/s | 16.2 J/TH |
| 6,050 W | 371 TH/s | 16.3 J/TH |
| 6,300 W | 383 TH/s | 16.4 J/TH |
Actual performance varies by individual unit silicon quality, ambient temperature, and cooling configuration. These operating points are achievable with custom tuning firmware such as DCENT_OS; values are calculated at runtime by the autotuner, not fixed presets.
Home Mining Assessment
Too loud and power-hungry for home use without modifications
The Antminer S21 is a SHA-256 cryptocurrency miner manufactured by Bitmain. It delivers a hashrate of 200 TH/s with a power consumption of 3500W, achieving an efficiency of 17.5 J/TH.
Built on the BM1368 ASIC chip, uses air cooling, operates at 75 dB noise level, weighs 14.6 kg, measures 400x195x290.
With a home mining score of 36/100, this miner is best suited for dedicated mining spaces for residential use. It produces 11942 BTU/h of heat output, making it effective for supplemental space heating.
At 17.5 J/TH, the Antminer S21 sits in the current-generation efficiency tier, competitive with modern SHA-256 hardware (roughly 13-19 J/TH).
Its waste heat (around 11942 BTU/h) can be ducted into a room, turning money you would otherwise spend on heating into hashrate.
D-Central’s in-house technicians repair the Antminer S21.
View detailed specifications, real-time profitability calculations, and comparison data for the Antminer S21 in our comprehensive ASIC miner database.
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Codes d'erreur courants du Antminer S21
Codes d'erreur connus et guides de dépannage pour le Antminer S21. Cliquez sur une erreur pour des instructions de réparation étape par étape.
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Antminer S19 – Firmware Update Failed
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Antminer S21 – Fan Speed Error
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Antminer S21 – Hashboard Not Detected
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Frequently Asked Questions
What are the current mining economics for the Antminer S21?
At $0.07/kWh, the Antminer S21 currently shows an estimated daily net cost of $0.19 before pool fees and hardware cost. Lower electricity rates, network changes, BTC price changes, or useful heat recovery can change the result.
Can I mine Bitcoin at home with the Antminer S21?
The Antminer S21 has a home mining score of 36/100. With 75 dB noise and 3,500W power draw, it may require a dedicated space like a garage, basement, or outdoor enclosure. Consider noise insulation and proper ventilation.
Can the Antminer S21 heat my home?
The Antminer S21 outputs approximately 11942 BTU/hr of heat. For reference, a typical space heater produces 5,000-5,500 BTU/hr. All electrical energy consumed by the miner is converted to heat, making it 100% efficient as a heater. D-Central offers Bitcoin Space Heater builds designed specifically for home heating integration.
Does D-Central repair the Antminer S21?
Yes, D-Central provides professional repair services for the Antminer S21. Services include hashboard repair, control board diagnostics, fan replacement, and full refurbishment. Ship your miner to our Laval, Quebec facility for diagnosis and repair.
What power supply does the Antminer S21 need?
The Antminer S21 draws 3,500W of power. You need a power supply rated for at least 3,850W with appropriate voltage (200-240V AC). D-Central stocks compatible power supplies in our shop. Always use a quality PSU from a reputable manufacturer to protect the miner and wiring.