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Bitmain

Bitmain Antminer S21 (195 TH/s)

Model: Antminer S21

Condition: new

195 TH/s air cooled SHA-256 at 3,400W. 17.4 J/TH, 12V. Bitmain's foundational S21 platform Bitcoin miner. Ships from MillionMiner with warranty.

195 TH/s 3400W SHA-256 17.44 J/TH

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Hashrate

195 TH/s

Power

3400 W

Efficiency

17.44 J/TH

Noise

75 dB

Estimated Mining Returns

Based on current BTC price & network difficulty. Indicative only.

Period Daily Weekly Monthly
Income
$6.86 $48.02 $205.80
Electricity
-$6.53 -$45.71 -$195.90
Profit
$0.33 $2.31 $9.90

Using 0.080 $/kWh · Network difficulty as of today. Estimates only.

Adjust rate in the bar above

Full Specifications

Hashrate 195 TH/s
Power Consumption 3400 W
Efficiency 17.44 J/TH
Algorithm SHA-256
Model Antminer S21
Release Year Apr 2024
Noise Level 75 dB
Dimensions 195 x 290 x 370mm
Weight 13.2 kg
Voltage 12V
Interfaces Ethernet
Operating Temp 5 - 35 °C
Humidity 5 - 90 %
Cooling Type Air

What's in the Box

Antminer S21
Power supply unit (PSU)
Power cables
Quick start guide

Contents may vary by batch. Exact items listed in order confirmation.

Quick Setup

1

Connect PSU to miner and plug into the outlet

2

Connect ethernet cable to your router or switch

3

Find miner IP via router admin or IP scanner tool

4

Open web interface, enter pool URL and wallet — start mining

Product Details

Bitmain Antminer S21 195TH Air Cooled SHA-256 Bitcoin Miner Foundation Platform

Pay attention to the voltage: 12V DC. Most Bitmain Antminers accept AC power directly. The S21 at 195 TH/s on 12V requires a separate high amperage power supply unit that converts AC to 12V DC. This adds cost, weight, and a failure point. Factor the PSU into both your budget and your deployment planning.

195 TH/s at 3,400W makes this the base S21, sitting below the S21+ at 235 TH/s and the S21 PRO at 234 TH/s. The S21 generation bridged the gap between the S19 era (95 to 151 TH/s) and the S23 generation (318 TH/s). Efficiency at roughly 17.4 J/TH is mid tier by current standards.

Daily electricity at $0.07 per kWh: $5.71. Monthly: $171. The 12V DC quirk means you also need a PSU capable of sustaining 3,400W continuously at 12V, which means roughly 283 amps. APW12 or equivalent Bitmain PSU. These run $100 to $300+ depending on source. Not included with the miner.

75 dB standard industrial. Ethernet. Bitmain Antminer firmware with full fleet management ecosystem. Third party firmware like Braiins OS likely available for S21 models, offering potential efficiency optimization through autotuning.

For fleet buyers, the 12V DC version of the S21 sometimes appears at lower acquisition cost than the AC versions precisely because the PSU requirement discourages casual buyers. If you already operate 12V infrastructure or can source PSUs cheaply, this pricing gap becomes an arbitrage opportunity.

Antminer S21 195TH Foundation Air Cooled Bitcoin Miner

Original Bitmain S21 at 195 TH/s and 3,400W. The model that defined the S21 generation before the S21+, S21 XP, and S23 followed. Now two generations behind the S23 (318 TH/s). Available at significant discount. 12V DC input.

Air cooled at 75 dB. Bitcoin, Bitcoin Cash, all SHA 256. Bitmain firmware. 195 x 290 x 370mm at 13.2 kg. Ethernet. 5 - 35 °C.

Industrial 75 dB requires dedicated mining space. Warehouses, containers, or isolated rooms. Not for shared environments.

Bitmain firmware for pool configuration and monitoring. Evaluate pricing against competing models at this tier.

Industrial noise at 75 dB demands purpose built mining space. Warehouses, shipping containers, dedicated rooms with sound treatment, or hosting facilities. Plan for noise management in any deployment. 3400W of heat output also requires adequate ventilation or HVAC capacity to maintain operating temperatures.

Evaluate per terahash acquisition cost and daily electricity at your rate. Total fleet hashrate determines total coins mined. Model conservatively with current network data.

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Antminer S21 195TH BTC Miner

Industrial SHA-256 from Bitmain. 195 TH/s at 3400W and 75 dB on 12V. 13.2 kg at 195 x 290 x 370mm. Bitcoin, Bitcoin Cash, all SHA 256. Ethernet. Bitmain. Compare pricing. Dedicated mining space required. Total cost of ownership determines value at your electricity rate. Factor acquisition and deployment duration. Bitmain firmware for pool configuration and monitoring. Total cost of ownership determines value. Factor acquisition plus daily electricity over planned deployment.

195 TH/s S21 Foundation

The platform that defined current gen Bitcoin mining. Bitmain's latest silicon at the most accessible entry price.

Sub 20 J/TH Standard

Major efficiency leap over S19 generation. 17.4 J/TH for competitive air cooled mining economics.

Free DDP Worldwide

Ships from MillionMiner with Bitmain warranty and free DDP delivery.

FAQ

Frequently Asked Questions

195 TH/s on SHA-256 at 3,400W with 17.4 J/TH efficiency.

12V DC input. Requires specific power supply configuration.

The foundation model. The S21+, S21 XP, and S21e variants all build on this platform with higher hashrates and better efficiency.

Bitcoin (BTC), Bitcoin Cash (BCH), and all SHA-256 cryptocurrencies.

Yes. A major improvement over the S19 generation. Competitive for air cooled mining.

No. 75 dB and 3,400W require a facility.

195 x 290 x 370mm at 13.2 kg.

Yes. Current generation with full Bitmain parts support.

Free worldwide DDP delivery with Bitmain warranty.