The Bitmain Antminer S21 Pro 245Th is an ASIC miner built for the ️ SHA-256 algorithm, optimised specifically for mining Bitcoin & Bitcoin Cash. Developed by Bitmain, this miner is part of the acclaimed Antminer S Series, released in 2024.
The Antminer S21 Pro features ️ Air cooling technology where no additional cooling equipment is required. However, good airflow, air separation, and effective cooling practices are essential for optimal hashing.
Mining Potential: With the Antminer S21 Pro, you can mine popular cryptocurrencies including Bitcoin, Bitcoin Cash, Bitcoin SV, eCash, DigiByte, Namecoin, Syscoin, Elastos, Peercoin, Fractal Bitcoin and Hathor, or earn Bitcoin on NiceHash.
$2,098.00
The Bitmain Antminer S21 Pro 245Th is an ASIC Miner designed specifically for the SHA-256 algorithm, optimised to mine Bitcoin & Bitcoin Cash. It operates at a hash rate of 245Th, achieving an efficiency of 15W/Th, with a total power consumption of 3675W. The miner runs at a voltage of , drawing a current of A. Produced by Bitmain, this miner is part of the Bitmain Antminer S Series, released in July, 2024. It features connectivity via and utilises advanced Air Cooling Technology.
Manufacturer Bitmain specifications accurate as of 12 October 2025. Pricing is subject to rapid market changes; confirm latest availability before ordering.
Consider the Bitmain Antminer S21 Pro 245Th Bitcoin BTC/BCH/BSV SHA-256 ASIC Miner for good performance and value. This machine offers dependable efficiency, making it a practical choice for any miner. Invest wisely and secure your mining future with consistent results!
We rank every miner across four pillars — Earnings, Efficiency, Value, and ROI. The Overall Device Rank blends these into a single composite snapshot so you can see where a model sits at a glance. SHA-256 Algorithm Rank compares only devices that mine using SHA-256, and Bitmain Brand Rank compares models within Bitmain‘s lineup. We show both the overall rank and the underlying sub-ranks to keep the methodology transparent.
Overall Device Rank:
The Bitmain Antminer S21 Pro 245Th ranks #87 out of 366 ASIC miners based on combined Earnings, Efficiency, Value & ROI.
Score: all ASIC miners in our catalogue.
Earnings Rank
#76 of 366
Efficiency Rank
#35 of 366
Value Rank
#233 of 366
ROI Rank
#193 of 366
SHA-256 Algorithm Rank:
The Bitmain Antminer S21 Pro 245Th ranks #86 out of 267 SHA-256 miners for mining Bitcoin & Bitcoin Cash.
Score: SHA-256-only ASIC miners in our catalogue.
Earnings Rank (SHA-256)
#61 of 267
Efficiency Rank (SHA-256)
#17 of 267
Value Rank (SHA-256)
#202 of 267
ROI Rank (SHA-256)
#178 of 267
Bitmain Brand Rank:
The Bitmain Antminer S21 Pro 245Th ranks #41 out of 164 Bitmain miners across Earnings, Efficiency, Value & ROI.
Score: Bitmain miners in our catalogue.
Earnings Rank (Bitmain)
#43 of 164
Efficiency Rank (Bitmain)
#38 of 164
Value Rank (Bitmain)
#106 of 164
ROI Rank (Bitmain)
#87 of 164
How to read this: Overall compares this model against all ASIC miners in our catalogue. SHA-256 compares only miners that use that algorithm. Bitmain compares only models within that brand. The Overall rank is a composite score that blends Earnings + Efficiency + Value + ROI.
Not sure how to interpret the rankings for your situation?
We can translate the numbers into a plan that fits your electricity rate, budget, and timeline.
⚠️ Rankings & Methodology Disclaimer:
Ranks are snapshots that can change with coin prices, network difficulty, device pricing, and electricity costs. “Value” uses current price and 12-month average earnings; “ROI” is calculated using the 24-hour average earnings shown. Methodology may evolve as we improve our scoring. This information is educational and not financial advice.
Bitmain is a China-based company founded in 2013 by Micree Zhan and Jihan Wu. It is one of the most influential players in the cryptocurrency mining industry. Bitmain is known for its large-scale operations, international reach, and role in shaping global mining infrastructure. The company has established regional offices worldwide and maintains a strong presence in both hardware development and mining farm management. Bitmain also supports blockchain research and development through strategic partnerships and investment.
Released in 2024 as part of the Antminer S Series, the Bitmain Antminer S21 Pro 245Th Bitcoin BTC/BCH/BSV SHA-256 ASIC Miner extends Bitmain’s line-up of dedicated SHA-256 ASIC miners.
Overall Rank within the Bitmain Models:
The Bitmain Antminer S21 Pro 245Th is ranked #41 of 164 across Earnings, Efficiency, Value & ROI among all Bitmain miners.
Earnings Rank within the Bitmain Models:
The Bitmain Antminer S21 Pro 245Th is ranked #43 of 164 for daily revenue inside the Bitmain line-up.
Efficiency Rank within the Bitmain Models:
The Bitmain Antminer S21 Pro 245Th is ranked #38 of 164 for energy efficiency among all Bitmain ASIC miners.
The ranking figures above show where the Bitmain Antminer S21 Pro 245Th stands among all Bitmain miners for daily earnings, energy efficiency, and overall composite score (Earnings + Efficiency + Value + ROI). Use them to see at-a-glance how this model stacks up inside the (BITMAIN) brand line-up.
SHA-256 (Secure Hash Algorithm 256-bit) is the cryptographic algorithm used in Bitcoin’s proof of work mining process. It converts input data, such as a block of transactions, into a fixed-length 256-bit hash. Miners compete to find a hash that meets Bitcoin’s difficulty target by rapidly changing a value called a nonce and rehashing the data. The first miner to find a valid hash earns the right to add the block to the blockchain and receives a Bitcoin reward. SHA-256 is known for its security, stability, and high computational requirements, making it ideal for large-scale ASIC mining.
The Antminer S21 Pro runs on the SHA-256 algorithm at a hash rate of 245Th, drawing 3675W of power and achieving an efficiency of 15W/Th.
With the Antminer S21 Pro, mining on the SHA‑256 algorithm, you can secure Bitcoin (BTC), Bitcoin Cash (BCH) and AuxPoW siblings such as DigiByte SHA (DGB), eCash (XEC), Peercoin (PPC) and Fractal Bitcoin (FB); you can also earn Bitcoin and other coins by selling your SHA‑256 hash‑power on the NiceHash Hashpower Marketplace (Nicehash‑SHA‑AB).
Overall Rank among all SHA-256 Miners:
The Bitmain Antminer S21 Pro 245Th is ranked #86 of 267 across Earnings, Efficiency, Value & ROI within the entire SHA-256 miner class.
Earnings Rank within the SHA-256 Miners:
The Bitmain Antminer S21 Pro 245Th is ranked #61 of 267 for daily revenue compared with other SHA-256 devices.
Efficiency Rank within the SHA-256 Miners:
The Bitmain Antminer S21 Pro 245Th is ranked #17 of 267 for energy efficiency (power per Th) among all SHA-256 ASIC miners.
The ranking figures above show where the Bitmain Antminer S21 Pro 245Th stands among all SHA-256 miners for daily earnings, energy efficiency, and overall composite score (Earnings + Efficiency + Value + ROI). Use them to see at a glance how this model stacks up inside the SHA-256 algorithm category.
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