Antminer S21 Pro Bitcoin Miner 234TH for Bitcoin Mining

(54 customer reviews)


  • Brand: Antminer S21 Pro
  • Model: 234 TH/s @ 3531w
  • In stock, shipped out within 14 working days!

Out of stock

Why Choose Us


The Antminer S21 Pro, an advanced iteration of Bitmain’s Antminer S21, spearheads innovation in bitcoin mining technology. Boasting a remarkable hashrate of up to 250TH/s while consuming a mere 3,550 watts of power, it sets a new standard in efficiency.

Equipped with cutting-edge 5nm chips, the S21 series marks a significant leap forward, achieving up to 40% greater efficiency compared to its predecessor, the S19 model. Specifically, the S21 Pro achieves an impressive 14.2 J/T efficiency rating.

With its unparalleled performance, the Antminer S21 Pro is poised to ignite a fresh wave of competition in the bitcoin mining landscape, heralding a new era in the ongoing arms race of mining technology.



Brand Antminer S21 Pro
Model S21 Pro
Algorithm | Cryptocurrency SHA256 | BTC/BCH/BSV
Hash Rate 234TH/s ± 3%
Power on wall @25°C, Watt 3531w ± 5%
Power efficiency on wall @25°C, J/TH 15 ± 5%
Power Supply With PSU
Power supply AC Input voltage, Volt(1-1) 200~240
Power supply AC Input Frequency Range, Hz 47~63
Power supply AC Input current, Amp(1-2) 20(1-3)
Networking connection mode RJ45 Ethernet 10/100M
Miner Size (Length*Width*Height, w/o package),mm(2-1) 400*195.5*290
Miner Size (Length*Width*Height, with package),mm 570*316*430
Net weight, kg(2-2) 14.2
Gross weight, kg 16.0
Operation temperature,°C 0~40
Storage temperature,°C -20~70
Operation humidity(non-condensing) , RH 10~90%
Operation altitude, m(3-1) ≤2000
Warranty 180 days


Purchasing Guidelines

  • Customers can purchase up to 200 units.
  • If the hashrate of the delivered mining machine is lower than 210TH/s, Niceasicminer will refund the difference according to $/T.
  • Full payment is required for the product.
  • Niceasicminer will not entertain requests to cancel an order, refund an ordered amount, or change the ordered item(s) to different item(s) or different batch(es) after an order has been submitted.


Shipping Details

  • Shipments will be scheduled on a first-paid-first-ship basis for orders on which Niceasicminer has received full payment.
  • Customers are responsible for any customs delays or returned shipments due to a lack of proper documentation. It is highly recommended to be aware of local customs clearance policies and to prepare all customs documentation ahead of time to avoid any customs clearance delays or unexpected costs.



  • A 180-day warranty is provided starting from the shipping date. Niceasicminer will cover shipping costs when shipping a replacement unit within the warranty period.
  • The warranty only applies to the original purchaser who purchased the machine directly from BITMAIN. Once the miner is resold, warranty coverage becomes the responsibility of the reseller.
  • If the user fails to use the product according to the given instructions, specifications, and conditions provided, or changes the function settings of the unit without Niceasicminer prior consent, Niceasicminer will not be liable for any damage arising therefrom.

Additional information

Weight 18 kg

234 TH/s @ 3531w



Mineable Coins

BTC/BCH etc.

Hash Rate

234 TH/s ± 5%

Power Consumption

3531w ± 5%


15 J/TH ± 5%


RJ45 Ethernet 10/100M


4 x fan


With PSU

Miner Size (Length * Width * Height, w/o package), mm

400 * 195.5 * 290

Miner Size (Length * Width * Height, with package), mm

570 * 316 * 430

Net weight, kg




54 reviews for Antminer S21 Pro Bitcoin Miner 234TH for Bitcoin Mining

  1. sergo-741 (verified owner)

    Fantastic!Fast shipping.Thanks seller.

  2. wpgminer (verified owner)

    Quick delivery, recommended reseller!

  3. alexeyvolkov69 (verified owner)


  4. darylweisser (verified owner)

    fast, will do business again.

  5. eggsto (verified owner)

    good reseller! Thank you

  6. davalex (verified owner)

    best item and Good seller thks

  7. gavin (verified owner)

    good reseller! Thank you

  8. region58 (verified owner)

    I have not checked yet, if there are problems with work, I will complement the review.

  9. antminer26 (verified owner)

    fast shipping and delivery, recommended seller.

  10. stoneface2 (verified owner)

    Great seller. Recommend!

  11. antminer5d (verified owner)

    fast and trusted! Strongly recommend!

  12. m_maxxtor (verified owner)

    recommended seller!

  13. newsoundtech (verified owner)

    Everything is fine, it works, I\’ll add it later

  14. antonfilippovd3 (verified owner)

    best seller. Recommend!

  15. cryptonatorcoin (verified owner)

    Strongly recommend!

  16. bekaiia (verified owner)

    Excellent service and communication. Quick delivery

  17. galiev_ (verified owner)

    It\’s coming, it\’s working.

  18. ichristian08 (verified owner)

    professional, Recommend

  19. mbilaldar78 (verified owner)

    Good seller! will buy again

  20. rinatilkaev (verified owner)

    Works ok cold

  21. formining001 (verified owner)

    packaging very very well done with reinforcement

  22. loganmcdonald (verified owner)

    Worked for a couple of weeks without interruptions.

  23. ml (verified owner)

    Perfect! Recommend to all!

  24. tisnoslo (verified owner)

    good communication, recommended seller!

  25. xue.zhao (verified owner)

    Good packaging, will buy again

  26. sc0ch (verified owner)

    The machine works fine.

  27. ds (verified owner)

    Great seller. will order again

  28. bisness.gorod (verified owner)

    shipping fast, recommended

  29. chad.cushway (verified owner)

    Packing with meticulous

  30. shawn (verified owner)

    fast shipping and delivery, Recommend to all!

  31. piarstih (verified owner)

    very helpful

  32. pnz79 (verified owner)

    Very good item! recommended reseller.

  33. marlenn777 (verified owner)

    the block is excellent; started in work

  34. truhanidzeyuridze (verified owner)

    Really speedy delivery – good product

  35. klazarid (verified owner)

    responsive seller

  36. awkwardtranslations (verified owner)

    fast shipment, Recommend!

  37. l.l (verified owner)

    Excellent quality, very happy

  38. dmitreyz85 (verified owner)

    Excellent service, all good, thx

  39. math.vachon (verified owner)

    professional, will order again

  40. ahmed.sa3eed (verified owner)

    Perfect communication! will order again

  41. enotes (verified owner)


  42. tdmerkel (verified owner)

    Excellent service, Thank you

  43. vasyusha.frolov.82 (verified owner)

    잘 작동

  44. pasprofeta (verified owner)

    recommended seller!

  45. chernomor2009 (verified owner)


  46. vanwest (verified owner)

    Very good item! Recommend to all!

  47. burdin.v (verified owner)

    Perfect! Recommend to all!

  48. gabrieldellix (verified owner)

    perfect! thanks a lot

  49. jmorning (verified owner)

    Perfect! Recommend!

  50. georgeflora (verified owner)

    Very good item! Strongly recommend!

  51. jows.hwang (verified owner)

    fast shipping and delivery

  52. currenl (verified owner)

    Good packaging, will buy again

  53. firestarter1979 (verified owner)

    A regular client of this seller. Excellent goods, packing as high as possible, the price is good. Recommend to cooperate

  54. nata05200 (verified owner)

    good reseller! thanks a lot

Only logged in customers who have purchased this product may leave a review.

We'll be by your side every step of the way to make sure your purchase is risk-free and hassle-free. We love cryptocurrency and our goal is to make you happy with our services. Find out how we stand out from the crowd and why you will benefit from working with us.

Purchase Contracts

Proforma invoice

Proforma invoice available for each individual order.

The invoice can be downloaded from the My Account page once payment has been made.

Formal sales contract

The formal purchase agreement is available for orders of US$50,000 (or more) or 50 units (or more).

In this case, please contact after payment made to get your contract.

Full Refundable

7-days no-questions-asked refund

7-days(from the time the delivery is signed for) no-questions-asked refund is available for every order.

The buyer must return the miner, with shipping costs paid by the buyer.

30-days full refundable

If there is a problem with the miner within 30 days of signing for delivery, the buyer can get a full refund.

The buyer must return the miner and the shipping costs will be covered by NiceAsicMiner.

Defective on arrival

If defective on arrival, the buyer will receive a full refund immediately and no return of the miner is required.

Learn more about the refund and return policy at:

Secure Checkout

Our reliable payment systems give you the highest level of security at checkout.

We use cryptocurrency, which is reliable, and our shopping cart is powered by the HTTPS protocol, which uses 256-bit SSL certificates to encrypt your data and is Level 1 PCI compliant.

Test before shipping

Every miner from NiceAsicMiner comes with a test video before shipping so you can check out what it looks like when you receive it.

Smooth Setup

You don't need to be a technical expert or have any knowledge of cryptocurrencies or ASIC mining to set up your miner.

Setup is easy. If you want to make sure you're doing it right, we'll set it up for you for free.


All miners are covered by a 180 day warranty (from the time the miner is signed for).

We've thoroughly tested all our miners to make sure there are no problems, but if there are, we'll fix them right away. Remember, we are always here to help you with any problems you may have.

You can get an extended 12-month warranty and free additional services when you purchase a Care Protection Plan.

Satisfying our customers is very important to us and we are sorry our product didn’t meet your expectations. Below are the details of our refund and return policy for your reference.


Three types of refund requests are supported:

  • 7-days no-questions-asked refund
  • 30-days full refundable
  • Defective on arrival

7-days no-questions-asked refund

7 days (from the time the delivery is signed for) no-questions-asked refund is available for every order.

The buyer must return the miner, with shipping costs paid by the buyer.

30-days full refundable

If there is a problem with the miner within 30 days of signing for delivery, the buyer can get a full refund.

The buyer must return the miner and the shipping costs will be covered by NiceAsicMiner.

Defective on arrival

If defective on arrival, the buyer will receive a full refund immediately and no return of the miner is required.

There are certain situations where only partial refunds will be given:

  • Any item that is not in its original packaging.
  • Any item returned more than 30 days after the date of delivery.

Other notes on the refund policy:

  • To be eligible for a return, your item must be in its original packaging.
  • To complete your return, we will need a receipt or proof of purchase.
  • Please do not return your purchase to the manufacturer.

Learn more about our buyer protection and warranty policies at:


Once we have received and checked your return, we will send you an email to let you know that we have received your returned item. We will also notify you of the approval or rejection of your refund. In the case of "Defective on arrival", your refund will be approved automatically.

If approved, your refund will be processed within 7 days. You will be notified by email when your refund has been processed.

Our refunds support the following payment methods:

  • USD (via Paypal)
  • USDT (TRC20)
  • Bitcoin (real-time exchange rate)
  • Any other cryptocurrency you prefer (real-time exchange rate)

Late or missing refunds

If you haven't received your refund yet, please check your Paypal or cryptocurrency account first. It may take some time for your refund to be officially posted.

Next, contact your bank or wallet provider. There is often a processing time before a refund is posted.

If you've done all this and still haven't received your refund, please contact us.


We will only replace items if they are faulty or damaged. If you would like an exchange for the same item, please email us at


If the item was marked as a gift when purchased and shipped directly to you, you'll receive a gift credit for the value of your return. A gift voucher will be sent to you once we have received the returned item.

If the item wasn't marked as a gift at the time of purchase, or if the gift giver had the order sent to themselves to give to you later, we will send a refund to the gift giver and notify them of your return.

By default, all miners will not be described as gifts in the waybill when shipped.

Shipping returns

To return your product, you should send it to our physical address.

Depending on where you live, the time it takes to receive your replacement product may vary.

If you are returning more expensive items, you may want to consider using a trackable delivery service or taking out a delivery insurance policy.

Need help?

Contact us at with any questions regarding refunds and returns.