Antminer S21+
Enhanced S21 with improved BM1370 chips. 216 TH/s at 16.5 J/TH efficiency. Standard Antminer form factor.
Professional-Grade Miner
This miner draws 3,564W 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.
Profitability Calculator
| Period | Revenue | Electricity Cost | Profit |
|---|---|---|---|
| Daily | $6.93 | $5.99 | $0.95 |
| Weekly | $48.54 | $41.91 | $6.63 |
| Monthly | $208.05 | $179.63 | $28.42 |
| Yearly | $2,531.24 | $2,185.44 | $345.80 |
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.
View ProductASIC Miner Market
United StatesWide selection of new and used ASIC miners. US-based shipping.
Shop NowFull Specifications
| Model | Antminer S21+ |
| Model Number | S21+ |
| Manufacturer | Bitmain |
| Algorithm | SHA-256 |
| Coins Mined | Bitcoin (BTC) |
| Hashrate | 216 TH/s |
| Power Consumption | 3,564 W |
| Efficiency | 16.5 J/TH |
| Noise Level | 75 dB |
| Chip Model | BM1370 |
| Cooling | Air |
| Voltage Range | 200-240V AC |
| Operating Temperature | 5-40°C |
| Dimensions | 400x195x290 |
| Weight | 15 |
| Interface | Ethernet |
| BTU Output | 12160.4 BTU/hr |
| Equivalent Heater | Equal to a 3,564W space heater |
| Daily Power Cost | $5.99/day |
| Monthly Power Cost | $179.63/mo |
| Circuit Requirement | 240V circuit required |
| Release Date | 2025-01-01 |
| MSRP | $6,500.00 |
| Status | Active |
Home Mining Assessment
Enhanced S21 with improved BM1370 chips. 216 TH/s at 16.5 J/TH efficiency. Standard Antminer form factor.
Related Miners
Bitmain Antminer T15 (23Th)
MicroBT Whatsminer M21S
Bitmain Antminer S21 Immersion (227Th)
Antminer S19 XP
Frequently Asked Questions
Is the Antminer S21+ profitable?
At $0.07/kWh electricity, the Antminer S21+ generates approximately $0.95 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 30/100. With 75 dB noise and 3,564W 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 12160.4 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 3,564W of power. You need a power supply rated for at least 3,920W 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.