Retailer with Location in Germany
Tailored consulting for your mining setup
Personal Customer Support
Home
ASIC Miner Shop
Bitmain Antminer S21 Immersion (239 TH/s)
Top seller
Bitmain
Bitmain Antminer S21 Immersion - 239 TH/s Bitcoin Miner BTC Mining
Bitmain Antminer S21 Immersion - detail view 1 - Bitcoin miner
Bitmain Antminer S21 Immersion - detail view 2 - Bitcoin miner
No items found.
No items found.

Bitmain Antminer S21 Immersion (239 TH/s)

1869
excl. taxes / incl. shipping
In stock, ready to ship
Available at short notice
No longer available
Only used available
Preorder
Request miner
Request Miner
No hosting available for this miner
Mining Hosting
Device can be placed in hosting at these locations:
UK
Request hosting
Request Miner & Hosting
Minimum order quantity:
/
We have a minimum order quantity for this device in order to place it on our hosting site.
Payment & Financing:
Bank Transfer
Cash Payment
Mastercard logo - Cryptohall24
Mastercard (+3%)
Visa logo as payment method - Cryptohall24
VISA (+3%)
American Express logo (payment method) - Cryptohall24
American Express (+3%)
Pay with Bitcoin: payment icon - Cryptohall24
Bitcoin (+1%)
USDC (USD Coin) logo as payment method - Cryptohall24
USDC (ERC20)
Klarna logo - Cryptohall24
Klarna Installment Payment (+3,5%)
Leasing from €10,000 (only in Germany)

Variants & Prices

Delivery: In stock.

Quantity
Variant (power consumption)Cryptohall24
warranty		Manufacturer’s
warranty		Availability
Antminer S21 Immersion 239 TH/s (3,824 W)SKU BTM-S21IMM-239TH€1,869€1,579In stock, ready to ship

What the Cryptohall24 warranty covers: 12 months from purchase - if a device fails, you simply send it to us. We handle the entire process: initial diagnosis, shipping to the manufacturer, ticket management, final testing and return shipping to you. You deal with a German contracting party and a dedicated contact in your own time zone. With the manufacturer’s warranty only, you arrange air freight, import and export handling and the manufacturer’s ticketing yourself - the effort and the downtime risk stay with you.

Technical data

ManufacturerBitmain
ModelAntminer S21 Immersion
AlgorithmSHA-256
CoinsBitcoin, Bitcoin Cash
Hashrate239 TH/s
Power consumption3824 watts
Efficiency16.0 J/TH
CoolingImmersion cooling
Dimensions (W x D x H)364 x 236 x 293 mm
Weight17.15 kg
Noise level58 dB

Description

The Bitmain Antminer S21 Immersion is a Bitcoin miner of the S21 generation built for immersion cooling; Bitmain presented it in July 2024. Bitcoin and Bitcoin Cash are the coins it mines via SHA-256. 239 TH/s at 16.0 joules per terahash are the figures of the version we offer. It weighs 17.15 kilograms, cools without fans and runs on a three-phase connection.

‍

Performance levels of the Antminer S21 Immersion

  1. S21 Immersion 239 TH/s at 3,824 watts (BTM-S21IMM-239TH)

‍

Those numbers belong to normal mode; the oil enters the unit at 30 degrees Celsius. Switched to high-energy mode, the S21 Immersion delivers 301 TH/s at 5,569 watts and 18.5 joules per terahash.

‍

Design, power connection and cooling of the S21 Immersion

The housing comes to 364 × 236 × 293 mm, measured including the 44-millimetre handle. For shipping, 570 × 316 × 430 mm and 20.45 kilograms add up.

‍

The cooling oil may enter at 30 to 55 degrees, and one cubic metre per hour should flow through the machine. The miner can be stored between minus 20 and 70 degrees.

‍

It is connected at 380 to 415 volts, 50 to 60 hertz and a maximum of 12 amps; the network runs over RJ45 at 10/100 Mbit.

‍

For the S21 Immersion there is Braiins OS, which supports immersion machines directly. Through the firmware each hashboard gets its own power target, lower for more economical operation or higher for more hashrate at poorer efficiency. We do the flashing before shipping at 29.90 euros net per unit, provided the miner runs in your own operation and not in our hosting. Anyone who changes the firmware loses the warranty from Bitmain and the warranty from us.

‍

As standard, Bitmain gives a 365-day factory warranty on the machine, counted from the shipping date; our standard price always includes our own warranty.

‍

Comparison with the next generation of the S21 Immersion

The S21 Immersion was followed in the next generation by the Antminer S23 Immersion, which also works in an oil bath. The two machines compared:

  • Antminer S21 Immersion: 16.0 J/TH (239 TH/s at 3,824 W)
  • Antminer S23 Immersion: 12.0 J/TH (442 TH/s at 5,304 W)

‍

The S23 Immersion needs 12.0 instead of 16.0 joules per terahash and reaches 442 instead of 239 TH/s per machine. Within the S21 generation, the Antminer S21 XP Immersion at 13.5 J/TH is the more economical choice. In the miner comparison the S21 Immersion stands with its daily revenue next to all other machines from our range.

‍

Verdict: Bitcoin mining with the Antminer S21 Immersion

The S21 Immersion has given us good experiences.

‍

That matches our experience with immersion miners overall, which run very stably and are cooled very well.

‍

With your electricity price and the 3,824 watts in normal mode, the Bitcoin mining calculator arrives at the daily revenue of the S21 Immersion. Price and Bitcoin network hashrate change it continuously; the cockpit keeps both current and lists the Bitcoin mining pools with share and fees alongside.

How the Purchase Process works

1

Request & Quote

You send us your inquiry, we come back with a binding quote and advise you on the right performance level. Once you confirm, we reserve the units.
2

Shipping & Import

Freight from Hong Kong, customs clearance and import VAT are handled by us. Before forwarding, we test every unit - you receive the machine cleared, taxed and tested.
3

Delivery or Hosting

We deliver to you, fully insured - or the machine goes straight to one of our hosting sites and is operated there under ideal conditions.
4

Commissioning

Pool, firmware, network: we set everything up together with you until the miner runs. We remain your point of contact - including in any warranty case.

Warranty provided by our German Company

When you buy mining hardware via Cryptohall24, you get a guarantee of 12 months In contrast to manufacturer warranties, our warranty only begins when the hardware is sold to our customers and not as soon as it leaves the factory. Since there can often be several months between production and sale in the mining market, our customers often have a longer effective protection than with the pure manufacturer's warranty.
‍
Optionally, the hardware can be added to insured for up to 36 months become.

Cryptohall24 employee providing technical support on an ASIC miner - Cryptohall24

Why Customers buy Miners from Cryptohall24

4.8
(148)
Legally secure corporate structure according to German law
German contact person with personal support
Transparent prices with no hidden fees - with 12 months of warranty
Professional advice about mining hardware, hosting and profitability
Support with structural, tax and legal matters
Service Excellence through long-term partnership

FAQ

Do you have any questions?

How does buying a miner work?

The process is clear and done in a few steps: you enquire about the device you want, you receive a written quote with the final price from us, and as soon as you accept it, we issue the invoice. After full payment is received, we trigger the order and the hardware is on its way to you.

That way you know where you stand at every point - from quote to delivery, a continuously supported process with a personal contact.

How can I pay?

You can pay conveniently by bank transfer in euros, in crypto (Bitcoin or USDC) or in cash against a receipt.

As throughout our business, payment is in advance: we trigger the order as soon as payment has been received in full. That keeps the process clean and predictable for both sides.

Are there discounts for larger quantities?

Yes, discounts are possible for larger quantities. How large they are depends on several factors - the device, the quantity, the delivery location and the respective procurement conditions.

That's why we state the right price best directly in an individual quote. Just tell us the model and the quantity you want and we'll work it out for you.

What is included in the delivery?

On modern ASIC miners the power supply is built firmly into the machine and is therefore always included - it does not have to be bought separately. An external power supply only existed with very old first-generation models.

So you receive a ready-to-run device. Whatever else specifically belongs to the respective product is stated in the product description; in case of doubt we clarify it in the quote.

Is the miner in stock and how quickly is it delivered?

You can see availability directly on the product; in case of doubt we confirm it in the quote. The majority of our hardware is located in our main warehouse in Hong Kong and is shipped from there directly to your destination.

Individual devices are in stock in Germany (Hamm) - those reach you particularly quickly. We state the concrete delivery date bindingly in the quote, as soon as device and destination are clear.

How is it delivered - internationally and with customs clearance too?

We deliver worldwide. We handle the shipping and the complete import processing including customs clearance for you - you don't have to deal with it yourself. We state the shipping costs transparently in the quote.

That way the miner arrives ready to use at your place or the desired site. On request we deliver directly to our hosting, then the device goes into operation without a detour.

What requirements do I need for operation?

To operate at home or in your own business you mainly need three things: a suitable power connection (ASIC miners draw several kilowatts continuously, large devices often three-phase power), enough space with ventilation, and a stable internet connection via LAN.

On top of that come noise and waste heat: air-cooled devices are very loud and heat the room noticeably. Anyone who doesn't meet these requirements usually has the miner hosted - then we take care of power, cooling and operation.

How do I set up the miner and can I get help?

Commissioning is straightforward: connect the device, plug it into the network and configure it to your mining pool and wallet. After that the miner runs around the clock.

We don't leave you alone with it - we support you with setting up pool and wallet and the first steps, even without prior experience. Your personal contact is available for questions.

What warranty do I have on the device?

As a German company we offer you 12 months' warranty on your hardware as standard.

Alternatively, you can exclude the warranty in the purchase contract and handle it via the manufacturer's warranty - then the device becomes cheaper. We offer both routes; which one makes sense for you we clarify in the quote.

Can I have this miner hosted directly instead of running it myself?

Yes. You can buy the device from us and have it hosted in the same step - then it runs at a site with low-cost electricity, without noise and heat at your home.

For many this is the most economical way. You can read how hosting works on our hosting page.

As a business customer, can I cancel or return?

We sell our devices to businesses (B2B). A statutory consumer right of withdrawal therefore does not apply in B2B business; in addition, we procure and import the hardware specifically for your order.

So you buy in a targeted and binding way. That's exactly why we calmly clarify the right device for your project before the quote - so you make the right choice from the start. If you have questions before buying, we are always reachable.

2