Bitmain Antminer S21

188 TH/s / Miner + Setup & Support

£1,175.00 £1,400.00

Bitmain Antminer S21

Verified ASIC Hardware Supplier

Bitmain Antminer S21

BTC & BCH ASIC Miner

£1,175.00 £1,400.00

Setup Available

In stock - Ready to Ship

Key Specifications

Hash Rate: 188-200 TH/s

Power: 3500W

Algorithim: SHA-256

Efficiency: 19J/T

Hashrate 188 TH/s 195 TH/s 200 TH/s

Package Miner + Setup & Support Miner Only

The Bitmain Antminer S21 series (188T / 195T / 200T) is a family of efficient and reliable SHA-256 ASIC miners designed for Bitcoin mining at home or in small-scale setups. With hashing power ranging from approximately 188 to 200 terahashes per second, these air-cooled units deliver solid mining performance while keeping power consumption and heat management accessible for UK and EU miners who want straightforward, powerful hardware.

Setup & Support: Recommended for most buyers

Remote setup service

Power & saftey guidance

Network & account setup

Miner configuration

This miner is available as hardware only or with our Setup & Support package which is recommended for most buyers.

The Setup & Support option includes remote configuration, power and safety guidance, network and mining account setup, and full miner configuration to ensure your equipment is deployed correctly and operating efficiently. Ongoing remote support is also available to assist with optimisation and troubleshooting.

Select the option that best suits your level of experience and operational requirements.

We dispatch in-stock items promptly and typical delivery is within 5-10 working days. Larger or high-value ASIC miners may be shipped via insured courier or palletised freight to ensure secure delivery. Please note that delivery times are estimates and may vary depending on stock availability and supplier schedules.

For full details on processing times, pre-orders, international delivery and delivery requirements, please refer to our Shipping Policy.

If you are purchasing as a consumer, you may cancel your order within 14 days of delivery, provided the item is unused and in its original condition. Due to the technical nature of ASIC mining equipment, hardware that has been installed, powered on or configured may not be eligible for return unless faulty.

Faulty goods are handled in accordance with UK consumer law. Business purchases and wholesale orders are non-refundable unless confirmed defective.

For full details, including return conditions and procedures, please refer to our Returns & Refunds Policy.

All ASIC miners are supplied with the original manufacturer’s warranty, provided the unit remains unmodified and is operated in accordance with the manufacturer’s guidelines. Warranty terms, duration and claim procedures are determined by the manufacturer.

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Model

Hash Rate

Power

Efficiency

Algorithm

Antminer S21

188 TH/s

3500W

19J/T

SHA-256

Antminer S21

195 TH/s

3500W

19J/T

SHA-256

Antminer S21

200 TH/s

3500W

19J/T

SHA-256

The Antminer S21 series represents one of Bitmain’s mainstream SHA-256 mining lines that builds on the success of earlier Antminer generations. This range includes three closely related performance tiers — 188T, 195T, and 200T — differing primarily in ASIC chip binning and firmware tuning while sharing the same core architecture and design.

Under typical conditions, power consumption for these models falls within roughly 3,000 to 3,600 watts depending on the specific hashrate variant, ambient temperature, and ventilation. These units employ air-cooling via multiple integrated fans and heatsinks, enabling stable 24/7 hashing with straightforward installation and management. Bitmain introduced the S21 lineup in late 2024, with widespread customer availability through 2025, making it a current-generation choice for retail miners.

The miners ship with Bitmain’s standard firmware interface, providing easy setup with popular mining pools and compatibility with third-party monitoring and management tools common in the Antminer ecosystem.

Bitmain is a globally recognised leader in cryptocurrency mining hardware and the creator of the Antminer brand. Since its founding in 2013, Bitmain has driven ASIC innovation across multiple proof-of-work algorithms, most prominently SHA-256 for Bitcoin mining. The company’s hardware is widely adopted by both retail miners and larger operations due to its performance, ecosystem support, and firmware maturity.

The S21 series reflects Bitmain’s continued commitment to balancing performance and energy efficiency while maintaining compatibility with established mining infrastructure. Bitmain miners benefit from broad support across mining pool software, firmware updates, and aftermarket dashboards and monitoring tools.

For the Antminer S21 series, typical energy efficiency falls in the range of ~9.0 to 10.5 joules per terahash (J/TH) under nominal air-cooled operating conditions. This measurement expresses the electrical energy consumed to deliver one unit of hashing work.

188T variant: Generally on the lower end of the power draw and efficiency range.
195T variant: Slight step up in hashrate with proportionate power usage.
200T variant: Highest hashrate in this group, typically with slightly higher total watts but similar overall efficiency class.

Efficiency varies with intake air temperature, fan speed, miner tuning, and PSU performance. In the UK and EU, where electricity costs tend to be higher than in some other regions, efficiency metrics are a key consideration when planning long-term mining deployments.

The Bitmain Antminer S21 series mines the SHA-256 proof-of-work algorithm, which is the cryptographic hashing function used by Bitcoin (BTC) and other SHA-256-based coins. ASIC miners dedicated to SHA-256 deliver far greater performance and energy efficiency than general-purpose hardware for this specific workload.

Miners running the S21 series contribute hashing power to secure the Bitcoin network and compete for block rewards and transaction fees. While it is technically possible to point these units at other SHA-256 compatible networks, most operators use them for Bitcoin due to its dominant hashrate, liquidity, and mining ecosystem.

ASIC miners like the Bitmain Antminer S21 series are designed for continuous 24/7 operation and typically remain productive for 3 to 5 years with proper maintenance. Key factors influencing lifespan include stable power delivery, adequate airflow, temperature management, and regular dust control.

Since the S21 models were released in late 2024 with broader availability into 2025, they represent a current generation of SHA-256 mining hardware. While future ASIC releases will continue to push efficiency and performance boundaries, the S21 series remains a competitive choice for retail miners seeking a balance of hashing power, efficiency, and manageable operational requirements.

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Frequently asked questions

We accept major debit and credit cards, bank transfer and selected digital payment methods where indicated at checkout. All payments must be received and cleared before goods are dispatched unless otherwise agreed in writing.

For certain orders, we offer a deposit option:

10% deposit for miners valued over £2,000
20% deposit for miners valued under £2,000

The remaining balance must be paid before dispatch. Deposit arrangements are subject to approval and confirmed stock allocation.

All miners are supplied with the original manufacturer’s warranty, provided the unit remains unmodified and is operated in accordance with manufacturer guidelines. Warranty terms and claim processes are determined by the manufacturer.

Yes. We offer an optional Setup & Support package that includes remote installation guidance, power and safety advice, network and mining account setup, and full miner configuration. Ongoing remote support is also available.

Yes. ASIC miners require appropriate electrical capacity and ventilation. We provide guidance on power supply, load considerations and safe operation, but customers remain responsible for ensuring their installation complies with local regulations.

Delivery times vary depending on stock status and location. Estimated timeframes are provided on product pages and at checkout. Pre-orders are subject to manufacturer schedules.

Yes. We support both new purchases and existing operations. Our team can assist with troubleshooting, optimisation, firmware configuration and scaling advice.

No. Mining profitability depends on factors outside our control, including Bitcoin price, network difficulty, power costs and regulatory conditions. We provide hardware and technical support, but returns cannot be guaranteed.

Yes. We supply individual operators and commercial-scale buyers. Please contact us directly to discuss wholesale availability and trade pricing.