Bitmain Antminer S21 Pro

220 TH/s / Miner + Setup & Support

£2,525.00

Bitmain Antminer S21 Pro

Verified ASIC Hardware Supplier

Bitmain Antminer S21 Pro

BTC & BCH ASIC Miner

£2,525.00

Setup Available

In stock - Ready to Ship

Key Specifications

Hash Rate: 220-245 TH/s

Power: 3675W

Algorithim: SHA-256

Efficiency: 15J/T

Hashrate 220 TH/s 234 TH/s 245 TH/s

Package Miner + Setup & Support Miner Only

The Bitmain Antminer S21 Pro series (220T / 234T / 245T) is a line of air-cooled SHA-256 ASIC miners designed to deliver strong Bitcoin mining performance in compact form factors suitable for home and small-scale setups. Offering a range of hashing capacities from approximately 220 to 245 terahashes per second, this series balances power, noise, and efficiency for retail miners in the UK and EU who want reliable hardware with modern efficiency improvements.

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.

Speak to an expert before buying

Get free independent advice with no obligation to help you choose the right miner for your needs.

Speak to Shahzun

Model

Hash Rate

Power

Efficiency

Algorithm

Antminer S21 Pro

220 TH/s

3675W

15J/T

SHA-256

Antminer S21 Pro

234 TH/s

3675W

15J/T

SHA-256

Antminer S21 Pro

245 TH/s

3675W

15J/T

SHA-256

The Antminer S21 Pro series builds on Bitmain’s S21 family by offering stepped-up performance and tuned firmware across three closely related variants — the 220T, 234T, and 245T units. These models share the same core ASIC architecture and air-cooled design but differ in ASIC binning and clock/frequency configuration to provide diverse performance options within the same generation.

Typical power consumption across the S21 Pro variants falls within the ~3,800 to 4,400 watts range under sustained operation depending on the specific hashrate tier, intake air temperature, and cooling environment. Bitmain released the S21 Pro lineup starting in late 2024 into 2025 as part of its next-generation SHA-256 ASIC offerings, focusing on improved energy usage and performance per watt compared with preceding generations.

Installation and setup are straightforward with Bitmain’s standard firmware interface and compatibility with major mining pools. The air-cooled form factor makes the S21 Pro series accessible for home miners without specialised cooling infrastructure.

Bitmain is a global leader in ASIC cryptocurrency mining hardware and the creator of the Antminer brand. Since its founding in 2013, Bitmain has driven hardware innovation across proof-of-work algorithms, most prominently SHA-256 for Bitcoin mining. Its miners are widely supported by mining pools, firmware ecosystems, and third-party monitoring and management tools.

With the S21 Pro series, Bitmain continues to refine ASIC chip design, board layout, and thermal performance to cater to miners who want solid performance and efficiency in a home-friendly package. Bitmain’s ecosystem support — including firmware updates, monitoring dashboards, and extensive documentation — contributes to strong usability and long-term operational reliability.

The Antminer S21 Pro series delivers energy efficiency in the ~8.0 to 10.0 joules per terahash (J/TH) range under typical air-cooled operating conditions. Efficiency reflects how many joules of electrical energy are consumed to compute one terahash of SHA-256 work.

220T variant: Typically at the lower end of the power draw range, offering slightly better nominal efficiency.
234T variant: Midrange performance with balanced power and throughput.
245T variant: Highest rated hashrate among the three, with proportionate power use.

Actual efficiency can vary with ambient conditions, miner tuning, and PSU performance. In UK and EU markets where electricity costs are comparatively high, these figures help miners evaluate ongoing operating costs relative to throughput.

The Antminer S21 Pro series mines the SHA-256 proof-of-work algorithm, the cryptographic hashing function that underpins Bitcoin (BTC) and other SHA-256-based cryptocurrency networks. SHA-256 miners contribute computational power to secure the blockchain, perform cryptographic puzzle solving, and compete for block rewards and transaction fees.

Although it is possible to direct these miners at other SHA-256 compatible coins, Bitcoin remains the primary target for most operators due to its dominant hashrate, liquidity, and mining ecosystem.

ASIC miners like the Bitmain Antminer S21 Pro series are engineered for continuous 24/7 operation and typically have an operational lifespan of 3–5 years with proper care. Key factors influencing lifespan include stable power delivery, adequate ventilation, ambient temperature control, and regular maintenance such as dust removal.

Released in late 2024–2025, the S21 Pro models represent a current-generation SHA-256 mining class that balances performance and efficiency. While newer ASIC generations may push further efficiency gains in the coming years, this series remains a viable choice for retail miners seeking a combination of solid hashing performance and manageable power profiles.

More ASIC Miners

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.