Bitmain Antminer S21 Pro 234T Bitcoin Miner: High-Efficiency SHA-256 Mining Rig

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The Bitmain Antminer S21 Pro (234Th/s) is one of the most advanced Bitcoin mining rigs on the market, engineered for maximum performance and energy efficiency. Designed to mine SHA-256 algorithm-based cryptocurrencies like Bitcoin (BTC) and Bitcoin Cash (BCH), this next-generation ASIC miner delivers a robust hashrate of 234 terahashes per second (TH/s) while consuming 3,531 watts of power—achieving an impressive efficiency of 15.0 J/TH.

Released in early 2024, the S21 Pro represents a significant leap forward from its predecessor, the Antminer S21, offering enhanced thermal resilience, improved power management, and superior durability under continuous operation. Whether you're scaling a large-scale mining farm or setting up a high-performance home rig, the S21 Pro delivers reliable, long-term profitability.

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Key Features and Specifications

Performance and Efficiency

The Antminer S21 Pro stands out with its optimized balance between raw computing power and energy consumption. With a hashrate of 234 TH/s, it outperforms earlier models by over 17%, making it ideal for competitive mining environments where every joule counts.

Its energy efficiency ratio of 15.0 J/TH places it among the most efficient SHA-256 miners available, reducing electricity costs and increasing net profit margins—especially crucial as network difficulty continues to rise.

Build and Durability

Built for industrial-grade reliability, the S21 Pro features dual integrated fans that maintain optimal cooling even under sustained loads. It operates efficiently within a temperature range of 5°C to 40°C (41°F to 104°F) and can withstand ambient conditions up to 45°C (113°F), making it suitable for diverse climates and unairconditioned spaces.

With a compact footprint measuring 400 x 195 x 290 mm and a noise output of 75 dB, the unit strikes a practical balance between performance and workspace compatibility. While not silent, its sound profile is manageable in dedicated mining rooms or basements.

Technical Overview

Mining Profitability: What Can You Earn?

While real-world profitability depends on variables such as electricity cost, pool fees, and cryptocurrency market prices, the S21 Pro remains highly competitive in current mining conditions.

For example, at an average electricity rate of $0.07 per kWh**, mining Bitcoin with the S21 Pro could generate approximately **$10–$14 per day in gross revenue (as of mid-2025), translating to a potential payback period of 8–14 months, depending on initial investment and BTC price fluctuations.

Keep in mind that profitability calculators provide estimates only—actual returns will vary based on network difficulty adjustments, block rewards, and uptime consistency.

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Compatible Cryptocurrencies

Thanks to its SHA-256 architecture, the Antminer S21 Pro is compatible with several major cryptocurrencies:

Miners can choose to mine either coin directly or use pool-switching services that automatically route hashing power to the most profitable SHA-256 chain at any given time.

Shipping, Availability & Order Process

Units are shipped from global warehouses, including U.S.-based inventory for faster delivery. In-stock orders are dispatched within 3 business days, with international shipping typically taking 5–8 business days via DHL, UPS, FedEx, or TNT.

For bulk purchases of two or more units, customers benefit from reduced shipping costs and priority handling. Pre-orders are subject to factory production timelines, with estimated delivery windows updated regularly.

All shipments follow a first-paid, first-shipped policy. Payment methods accepted include:

Cryptocurrency payments are automatically converted to USDT upon receipt. Refunds are issued in USD equivalent if items are out of stock.

DDP Shipping Options

Delivered Duty Paid (DDP) shipping is available for select regions including the United States, Canada, UAE (Dubai), Russia, and select EU countries, simplifying customs clearance and eliminating surprise import fees.

For other destinations, sellers may offer lower invoice values to help reduce duty assessments—a common practice in cross-border hardware transactions.

Warranty and Buyer Protection

New, factory-sealed Antminer S21 Pro units come with a 6- to 12-month manufacturer warranty, depending on production batch. The warranty covers defects in materials and workmanship but does not extend to damage caused by improper use, modifications, or environmental factors beyond specified operating conditions.

Used units are sold as-is, without warranty or after-sales support. However, pre-shipment testing videos are provided so buyers can verify functionality before accepting delivery.

Return shipping and repair logistics are the responsibility of the buyer. Repair turnaround times vary based on issue complexity and component availability.

Frequently Asked Questions (FAQs)

Is the Bitmain Antminer S21 Pro suitable for home mining?

Yes, but proper ventilation and power supply are essential. Due to its 75 dB noise level and heat output, it’s best installed in a garage, basement, or dedicated mining room. Liquid cooling upgrades can further reduce noise and thermal footprint.

Does the S21 Pro require additional accessories?

The unit includes the main miner and power supply unit (PSU). However, you’ll need an appropriate power cable and stable internet connection. For large-scale deployments, consider investing in rack mounts and cooling solutions.

Can I use liquid cooling with the Antminer S21 Pro?

While not natively liquid-cooled, third-party immersion and hybrid cooling kits are compatible. These systems improve efficiency by lowering operating temperatures and allow for quieter operation—ideal for space-constrained environments.

How long is the expected lifespan of the Antminer S21 Pro?

With regular maintenance and optimal operating conditions, ASIC miners like the S21 Pro typically remain profitable for 2–3 years, though they may continue functioning beyond that at reduced efficiency.

What happens if my miner arrives damaged?

Inspect the package upon delivery. If external damage is visible, note it with the carrier and contact customer support immediately. Internal issues must be reported within the warranty period with proof of purchase.

Are there any hidden costs when buying a miner?

The listed price excludes customs duties and taxes. These vary by country and are payable upon delivery. Some sellers offer DDP options or low-declaration invoices to minimize import fees.

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Final Thoughts

The Bitmain Antminer S21 Pro 234T sets a new benchmark for efficiency and performance in the world of Bitcoin mining. Its combination of high hashrate, low energy consumption, and rugged build quality makes it a smart choice for both individual enthusiasts and commercial operators.

As network difficulty rises and older models become obsolete, upgrading to efficient hardware like the S21 Pro ensures long-term competitiveness in the ever-evolving crypto mining landscape.

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