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, the electricity cost of running this miner replaces your heating bill — and you earn Bitcoin on top. In cold climates like Canada, this dual-purpose approach can dramatically improve mining economics. D-Central offers purpose-built Bitcoin Space Heater editions with noise reduction, duct adapters, and heater-mode firmware for seamless home integration.
Calculateur de rentabilité
| Period | Revenue | Electricity Cost | Profit |
|---|---|---|---|
| Daily | $6.14 | $5.88 | $0.26 |
| Weekly | $43.00 | $41.16 | $1.84 |
| Monthly | $184.28 | $176.40 | $7.88 |
| Yearly | $2,242.05 | $2,146.20 | $95.85 |
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.
Where to Buy the Antminer S21
D-Central Technologies
CanadaBitcoin Mining Hackers since 2016. Ships from Laval, Quebec.
Voir le produitASIC Miner Market
United StatesWide selection of new and used ASIC miners. US-based shipping.
MagasinerMinersDeals
United StatesCompetitive prices on new ASIC miners with coupon codes.
MagasinerFull 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 |
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.
View detailed specifications, real-time profitability calculations, and comparison data for the Antminer S21 in our comprehensive ASIC miner database.
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MicroBT Whatsminer M10S
Bitaxe Supra
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.
Antminer S19 – eMMC Failure
Antminer S19 series, S21 series (eMMC-based)
Antminer S19 – Firmware Update Failed
Antminer S19, S19 Pro, S19j Pro, S19 XP, S21
Antminer S19 – Inlet/Outlet Temperature Differential Too High
Antminer S19, S19 Pro, S19j Pro, S19 XP, S21
Antminer S21 – Fan Speed Error
Antminer S21
Antminer S21 – Hashboard Not Detected
Antminer S21
Antminer S21 – High-Pitched Whine
Antminer S21, S21 Pro
Frequently Asked Questions
Is the Antminer S21 profitable?
At $0.07/kWh electricity, the Antminer S21 generates approximately $0.26 in daily profit. Profitability depends on your electricity rate and Bitcoin network conditions. Use the calculator above with your actual electricity rate for personalized results.
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. Our technicians have repaired 2,500+ miners since 2016. 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 your investment.