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.
Specifications
| 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 |
Customer Reviews on Trustpilot
Check out what our customers have to say and see other more real customer reviews on our Trustpilot page.
I’ve dealt with other suppliers before, but NiceASICMiner stands out. Their transparency and timely delivery of my Antminer S21 Hyd were impressive. I’ll definitely return for my next upgrade.
Najla Abdulaziz
3 days ago
NiceASICMiner offers a hassle-free experience for miners. Their products are reliable, and their service is consistently excellent.
I’ve been mining for years, and this was my best purchasing experience so far. The Antminer S21 arrived on time and worked perfectly out of the box.
This site is a miner’s dream. I got the Antminer S21 at a great price, and it’s been incredibly efficient. Great customer support as well.
Giorgos Papadimitriou
3 days ago
The Antminer S21 Bitcoin Miner I ordered exceeded expectations! Shipping was prompt, and the device was packaged securely. I’ve been mining for a week now with fantastic results. Customer service was also very responsive when I had a question about the setup.
The entire process was seamless, from browsing to checkout. My Antminer AL1 ALPH Miner arrived safely and is functioning beyond my expectations.
Purchasing Guidelines
- Each user is limited to 500 units.
- If the hashrate does not meet the rated hashrate, a refund will be issued for the corresponding difference in hashrate.
- The pictures shown are for reference only; the final shipment version shall prevail.
Shipping Details
- The products are made in China.
- Shipmens will be scheduled on a first-paid-first-ship basis for orders on which NiceAsicMiner has received full payment.
- You are responsible for any customs delays or returned shipments due to a lack of proper documentation. It's 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.
Warranty
- A 180-day warranty period 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 NiceAsicMiner. Once the miner is resold, warranty coverage becomes the responsibility of the re-seller.
- Please check NiceAsicMiner Buyer Protection Policy and NiceAsicMiner Refund and Returns Policy for more details.
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 info@niceasicminer.com 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: https://www.niceasicminer.com/refund_returns/
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.
Warranty
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.
Overview
Three types of refund requests are supported:
- 7-days no-questions-asked refund
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: https://www.niceasicminer.com/buyer-protection-policy/
Refunds
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.
Exchanges
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 info@niceasicminer.com
Gifts
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 info@niceasicminer.com with any questions regarding refunds and returns.
antminer25 (verified owner) –
recomand , good quality
mokbara (verified owner) –
Great seller. will buy again
pulsar1972 (verified owner) –
Works great, Strongly recommend!
josh.bardoel (verified owner) –
good seller! thanks a lot
wormwater (verified owner) –
second order, all perfect, fast shipping, good packaging, recommended seller.
sergey.alfa (verified owner) –
Fast shipping thanks.
clark86 (verified owner) –
Good reseller! Recommend to all!
seb.saucier (verified owner) –
the Miner is in excellent condition. will order again
joshua93beckford (verified owner) –
Great reseller. Recommend
max.myt (verified owner) –
Logistics is fast and things are worth it
johnimatelot (verified owner) –
looks great,good delivery time
rc-shadow (verified owner) –
Got it. Works OK.
jimmyfan61 (verified owner) –
fast, will do business again.
ml (verified owner) –
Great store. The machine works as it should. the employees of the store reported on every status of delivery. good and health.
freefrom (verified owner) –
Very good item! recommended reseller!
densl (verified owner) –
fast, recommended
pnz79 (verified owner) –
good seller! Thank you
sale (verified owner) –
Good packaging
nata05200 (verified owner) –
good reseller! thanks a lot
firestarter1979 (verified owner) –
A regular client of this seller. Excellent goods, packing as high as possible, the price is good. Recommend to cooperate
currenl (verified owner) –
Good packaging, will buy again
jows.hwang (verified owner) –
fast shipping and delivery
georgeflora (verified owner) –
Very good item! Strongly recommend!
jmorning (verified owner) –
Perfect! Recommend!
gabrieldellix (verified owner) –
perfect! thanks a lot
burdin.v (verified owner) –
Perfect! Recommend to all!
vanwest (verified owner) –
Very good item! Recommend to all!
chernomor2009 (verified owner) –
thanks!
pasprofeta (verified owner) –
recommended seller!
vasyusha.frolov.82 (verified owner) –
잘 작동
tdmerkel (verified owner) –
Excellent service, Thank you
enotes (verified owner) –
excellent
ahmed.sa3eed (verified owner) –
Perfect communication! will order again
math.vachon (verified owner) –
professional, will order again
dmitreyz85 (verified owner) –
Excellent service, all good, thx
l.l (verified owner) –
Excellent quality, very happy
awkwardtranslations (verified owner) –
fast shipment, Recommend!
klazarid (verified owner) –
responsive seller
truhanidzeyuridze (verified owner) –
Really speedy delivery – good product
marlenn777 (verified owner) –
the block is excellent; started in work
pnz79 (verified owner) –
Very good item! recommended reseller.
piarstih (verified owner) –
very helpful
shawn (verified owner) –
fast shipping and delivery, Recommend to all!
chad.cushway (verified owner) –
Packing with meticulous
bisness.gorod (verified owner) –
shipping fast, recommended
ds (verified owner) –
Great seller. will order again
sc0ch (verified owner) –
The machine works fine.
xue.zhao (verified owner) –
Good packaging, will buy again
tisnoslo (verified owner) –
good communication, recommended seller!
ml (verified owner) –
Perfect! Recommend to all!
loganmcdonald (verified owner) –
Worked for a couple of weeks without interruptions.
formining001 (verified owner) –
packaging very very well done with reinforcement
rinatilkaev (verified owner) –
Works ok cold
mbilaldar78 (verified owner) –
Good seller! will buy again
ichristian08 (verified owner) –
professional, Recommend
galiev_ (verified owner) –
It\’s coming, it\’s working.
bekaiia (verified owner) –
Excellent service and communication. Quick delivery
cryptonatorcoin (verified owner) –
Strongly recommend!
antonfilippovd3 (verified owner) –
best seller. Recommend!
newsoundtech (verified owner) –
Everything is fine, it works, I\’ll add it later
m_maxxtor (verified owner) –
recommended seller!
antminer5d (verified owner) –
fast and trusted! Strongly recommend!
stoneface2 (verified owner) –
Great seller. Recommend!
antminer26 (verified owner) –
fast shipping and delivery, recommended seller.
region58 (verified owner) –
I have not checked yet, if there are problems with work, I will complement the review.
gavin (verified owner) –
good reseller! Thank you
davalex (verified owner) –
best item and Good seller thks
eggsto (verified owner) –
good reseller! Thank you
darylweisser (verified owner) –
fast, will do business again.
alexeyvolkov69 (verified owner) –
Good!
wpgminer (verified owner) –
Quick delivery, recommended reseller!
sergo-741 (verified owner) –
Fantastic!Fast shipping.Thanks seller.