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Bitmain

Bitmain Antminer S21 PRO (234Th)

Model: Antminer S21 PRO

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234 TH/s SHA-256 Bitcoin miner with premium chip selection for approximately 15 J/TH efficiency. Drop-in upgrade from the standard S21. Includes PSU and free DDP shipping from MillionMiner.

234 TH/s 3550W SHA-256 15.17 J/TH

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Quantity

Total Price

$3,083.00

Buying 10 or more? Get custom bulk pricing

Pay with: Bank Transfer | BTC | ETH | USDT

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Tested hardware

Worldwide

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Support

Mining experts

Hashrate

234 TH/s

Power

3550 W

Efficiency

15.17 J/TH

Noise

75 dB

Estimated Mining Returns

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

Period Daily Weekly Monthly
Income
$9.99 $69.93 $299.70
Electricity
-$6.82 -$47.74 -$204.60
Profit
$3.17 $22.19 $95.10

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

Adjust rate in the bar above

Updated daily. Last refresh: Apr 21, 2026. Estimates at $0.08/kWh.

Full Specifications

Hashrate 234 TH/s
Power Consumption 3550 W
Efficiency 15.17 J/TH
Algorithm SHA-256
Model Antminer S21 PRO
Release Year Mar 2024
Noise Level 75 dB
Dimensions 400 x 195 x 290mm
Weight 20 kg
Voltage 100-240V
Interfaces Ethernet
Operating Temp 5 - 45 °C
Humidity 5 - 95 %
Cooling Type Air

What's in the Box

Antminer S21 PRO
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 Pro 234TH Enhanced SHA-256 Bitcoin Miner

Nearly identical to the S21+ at 235 TH/s but from a different production batch with marginally different specifications. The S21 PRO at 234 TH/s and 3,550W sits at approximately 15.2 J/TH. The S21+ at 235 TH/s and 3,876W runs at 16.5 J/TH. The PRO actually uses 8 percent less power for virtually the same hashrate. That makes the PRO the slightly more efficient variant.

Both share universal 100 to 240V. Both run 75 dB. Both use standard Antminer firmware. The difference is subtle: 1 TH/s less hashrate at 326W less power. In a fleet of 10 units, the PRO saves about 3,260W compared to 10 S21+ units for roughly the same total hashrate.

Daily electricity at $0.07 per kWh: $5.96. Monthly: $179. Bitmain Antminer firmware with full fleet management. Third party firmware likely available. Ethernet. 5 to 45 degrees Celsius. 13.8 kg in the standard S21 chassis.

The S21 PRO positions between the S21+ (nearly identical) and the S23 (318 TH/s, 11.0 J/TH). Two S21 PROs produce 468 TH/s at 7,100W. One S23 produces 318 TH/s at 3,498W. The S23 is more efficient per terahash but the dual S21 PRO fleet produces 47 percent more total hashrate. Capital cost determines which fleet approach wins.

For fleet operators evaluating this specific model: compare acquisition cost per terahash against every alternative at similar hashrate. Factor $5.96 daily electricity into total cost of ownership over your planned deployment. The model delivering more Bitcoin per dollar of total investment (hardware plus electricity) over your deployment horizon is the correct purchase.

Antminer S21 Pro 234TH Enhanced Bitcoin Miner

Bitmain S21 PRO at 234 TH/s and 3,550W. Nearly identical hashrate to the S21+ (235 TH/s) but at 325W less power. The PRO designation means better J/TH efficiency from an optimized S21 variant. Universal 100 to 240V at 75 dB.

Air cooled at 75 dB. Bitcoin, Bitcoin Cash, all SHA 256. Bitmain firmware. 400 x 195 x 290mm at 20.0 kg. Ethernet. 5 - 45 °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. 3550W 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.

Need Help Choosing?

Our mining specialists can help you find the perfect miner for your setup and budget.

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S21 Pro 234TH Bitcoin Miner

Industrial SHA-256 from Bitmain. 234 TH/s at 3550W and 75 dB on 100-240V. 20.0 kg at 400 x 195 x 290mm. 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.

234TH Premium Chip Performance

Higher-quality ASIC chip binning pushes 17% more hashrate at nearly the same power draw as the standard S21 model.

Drop-In Infrastructure Upgrade

Identical form factor to the standard S21 means you can upgrade your fleet without changing racks, cabling, or cooling setups.

Bulk Pricing Available

Available in packages of 10 and 50 units with volume discounts for mining farms looking to scale efficiently.

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FAQ

Frequently Asked Questions

234 TH/s of SHA-256 at 3,510W with 15 J/TH efficiency. A solid mid-range Bitcoin miner in the Antminer S21 family.

The S21 XP delivers 270 TH/s at 13.5 J/TH — 15% more hashrate and 10% better efficiency. The S21 Pro is available at a lower acquisition cost, making it attractive for budget-conscious miners who still want current-generation hardware.

At $0.07/kWh, the S21 Pro generates daily profit that varies with market conditions. Check the live profitability calculator on this page for current numbers at your electricity rate. Profitability is electricity-dependent — highly profitable at hosting rates ($0.055/kWh) but marginal at residential rates above $0.09/kWh. BTC price appreciation to $150K+ would significantly improve margins.

Most analysts forecast BTC between $166,000 and $250,000 in 2026, with a median of $201,000. Post-halving supply compression and institutional ETF demand (50,000 BTC absorbed monthly) are key drivers.

Standard industrial noise at approximately 75 dB. Requires dedicated mining space or professional hosting.

Yes. Integrated PSU accepting 200-240V AC. No external power supply needed.

All SHA-256 cryptocurrencies: Bitcoin (BTC), Bitcoin Cash (BCH), BSV, eCash (XEC), and others.

Yes. Free worldwide DDP shipping to 50+ countries. All customs included. Genuine Bitmain hardware with warranty.

If budget allows, the S21 XP 13.5 J/TH efficiency delivers better long-term returns. If cash flow is a priority, the S21 Pro offers excellent value at a lower entry point with still-competitive 15 J/TH efficiency.

MillionMiner offers professional Bitcoin miner hosting from $0.055/kWh with 99.9% uptime, 24/7 monitoring, and your miner shipped directly to our facility for free.