Product Image - Antminer S21

Bitmain Antminer S21

$3,200.00

Price valid as of October 20, 2025
Buy now
Technical specifications
Hash-rate
200
Algorithm
SHA-256
Power consumption
3551
Release year
2023
Availability
In Stock
Description

With Antminer S21, profitability from mining becomes tangible and easily achievable. One of the latest entries in the Bitmain ASICs series, S21 is a beast of a mining setup, both powerful and flexible. It is a great, balanced entry point for new miners and a highly-efficient hardware addition or replacement for existing operations. 

Why Choose Antminer S21?

The Bitmain Antminer S21 is a state-of-art ASIC miner designed for SHA-256 algorithm cryptocurrencies like Bitcoin. With a hash rate of up to 195 TH/s and power consumption of 3500W, it offers an outstanding energy efficiency of 17 J/TH.

The Antminer S21 is designed for continuous operation, maximized uptime, and active profitability. With its high hash rate threshold, users can expect peak mining performance. Depending on network difficulty and electricity costs, Antminer S21 can help achieve highly profitable margins.

Bitmain Antminer S21 specifications:

  • High performance: Delivers a robust 195 TH/s hash rate at peak performance.
  • Energy efficiency: Consumes 3500W, optimizing electricity usage.
  • Compact design: Measures 400mm x 195mm x 290mm, fitting easily into any setup.
  • Durable build: Weighs 15.4 kg, keeping stable during operation.
  • Optimal operating conditions: Functions best between 0–45°C with 10–90% humidity.

How to Start Mining with Antminer S21?

It is fairly easy to install and start using a newly-purchased Antminer S21 even without EZ Blockchain’s assistance:

  1. Unbox and inspect: Check that all components are present and undamaged.
  2. Connect to power: Use a compatible power supply unit (PSU) to connect the miner to a 220~277V AC outlet.
  3. Set up network: Connect the miner to the internet via an RJ45 Ethernet cable.
  4. Access miner interface: Use a web browser to enter the miner’s IP address and access the configuration page.
  5. Configure mining pool: Input your preferred mining pool details and wallet address.
  6. Start mining: Save settings and begin the mining process.

Useful: Running the miner in stock configuration for a few hours before immersion cooling ensures all systems operate correctly, preventing potential damage during fluid immersions.

Important: The S21 model’s single power cord design simplifies electrical connections compared to older models, but high current requirements still mandate professional electrical inspection for safety

Delivery Time

Your newly-placed order for an ASIC miner takes 7–14 business to arrive, depending on the stock situation and your location. We provide a tracking number which you can use to watch the shipping process in real time and get updates on each milestone.

Shipping

We offer international shipping via big trusted couriers. Shipping costs may vary based on destination and package weight. For detailed shipping options and costs, please contact EZ Blockchain’s support.

Return policy

All sales of the Antminer S21 are final and non-refundable. We advise customers to review their orders carefully before purchase. For more details, consult Bitmain’s terms and conditions.

Warranty

The Antminer S21 comes with a 365-day warranty, which allows addressing manufacturing defects in up to a year from the official shipment date. Customers can check their warranty status by entering the miner’s serial number on Bitmain’s warranty check page.

Got more questions? EZ Blockchain will help you find your best-fitting configuration of the Antminer S21 for sale, assist with its full setup, and support you further, every step of the way. 

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KEY ADVANTAGES

Up to +40% Hashrate Boost

Thanks to immersion compatibility and advanced power management.

100% Noise & Dust Reduction

Silent, dust-free mining — suitable for any environment.

Extended Lifespan

Hardware runs cooler and lasts up to +5 years longer.

Smart Heat Reuse

Redirect heat for space warming or industrial use.

Lowest Operational Costs

Reduced cooling and maintenance expenses.

Seamless Integration & User-friendly Design

Built-in controller and intuitive interface ensure easy setup and monitoring, while integrated power supply eliminates the need for external units, providing a stable and efficient mining experience.

World Class
Service
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Highly recommend for anyone looking to get into crypto mining!
I’ve been using EZ Blockchain for the past six months, and I couldn’t be happier! The setup was straightforward, and their customer support is top-notch. My mining rigs are running smoothly, and I’ve seen a significant return on my investment.
Sarah J.
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Game-changer for my crypto endeavors
EZ Blockchain has been a game-changer for my crypto endeavors. The hosting environment is reliable, and I appreciate the transparency in their fees. I’ve had minimal downtime, and their analytics dashboard makes tracking my performance a breeze. A solid choice for miners of all levels!
Mike R.
starstarstarstarstar
Great experience with EZ Blockchain.
The mining equipment is top-of-the-line, and I love the flexibility in their hosting plans. I had a few questions during setup, but their support team was quick to help. I’ve already recommended them to friends who are interested in mining!
David T.

OTHER ASICS

Bitmain
Antminer S21 XP
$6140
Price valid as of October 20, 2025
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Hash-rate 270 TH/s
Algorithm
SHA-256
Power consumption
3645
Release year
2025
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MicroBT
WhatsMiner M60S+
$3670
Price valid as of October 20, 2025
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Hash-rate 203 TH/s
Algorithm
SHA-256
Power consumption
3468
Release year
2023
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ElphaPex
DG1+
$5790
Price valid as of October 20, 2025
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Hash-rate 0,0144 TH/s
Algorithm
Scrypt
Power consumption
3950
Release year
2024
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Bitmain
Antminer S21
$3200
Price valid as of October 20, 2025
In stock
Hash-rate 200 TH/s
Algorithm
SHA-256
Power consumption
3551
Release year
2023
Buy now
Bitmain
Antminer S21+
$4150
Price valid as of October 20, 2025
In stock
Hash-rate 235 TH/s
Algorithm
SHA-256
Power consumption
3564
Release year
2025
Buy now

FREQUENTLYASKEDQUESTIONS

What is the hashrate of the Antminer S21?

The Antminer S21 delivers a hashrate of 200 TH/s, offering robust performance for mining Bitcoin and other SHA-256-based cryptocurrencies.

How energy-efficient is the Antminer S21?

With an efficiency of around 17.5 J/TH, the S21 ensures low energy consumption while maintaining high output — ideal for reducing operational costs.

Can I monitor and manage my Antminer S21 remotely?

Absolutely. With our platform app.ezblockchain.net, you can monitor your S21 in real time, track key KPIs, analyze power usage, and even calculate your mining profits — all in one intuitive dashboard.

What are the power and setup requirements for the Antminer S21?

The S21 consumes approximately 3500W and requires a 220–240V power source. We recommend proper cooling and a stable environment for optimal mining performance.

Does EZ Blockchain provide hosting and support for the Antminer S21?

Yes. We offer turnkey hosting solutions, onsite setup, and 24/7 personal manager support to help you maximize your mining investment. Our management platform also allows you to pay energy bills directly in-app.

Contact Us for Expert Consultation
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