The Antminer S21 stands as a cutting-edge Bitcoin mining apparatus crafted by Bitmain. In partnership with TSMC, a prominent semiconductor manufacturer, Bitmain introduced the S21 series featuring advanced 7nm chips, elevating efficiency by a remarkable 40% compared to the preceding S19 models.
Following Bitmain’s tradition of odd-numbered names, the “S21” underscores their dedication to continual advancement. This enhanced efficiency not only enhances miners’ profitability but also tackles apprehensions regarding the environmental repercussions of mining.
In essence, the Antminer S21 signifies a substantial leap forward in the cryptocurrency mining arena.
Specifications
| Brand |
Antminer S21 |
| Model |
S21 |
| Algorithm | Cryptocurrency |
SHA256 | BTC/BCH/BSV |
| Hash Rate |
200TH/s ± 3% |
| Power on wall @25°C, Watt |
3010w ± 5% |
| Power efficiency on wall @25°C, J/TH |
17.5 ± 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.
decutter (verified owner) –
fast shipment, Recommend to all!
ddorfinnoahsark (verified owner) –
perfect! thanks a lot
w.girard (verified owner) –
Perfect communication! will buy again
anettta.ulx (verified owner) –
Great reseller. will buy again
yulin-ev6 (verified owner) –
All excellent. will buy again
birrobitcoin (verified owner) –
fast shipment, recommended reseller!
mike (verified owner) –
Great reseller. Thank you
lukasbeck (verified owner) –
good
mnadeemadi (verified owner) –
fast shipment, Strongly recommend!
digitalfarmerz (verified owner) –
fast shipment
wpgminer (verified owner) –
Great seller. Recommend
tan320 (verified owner) –
responsive reseller, Recommend
lyness067 (verified owner) –
As in the description
gipnoshmel (verified owner) –
fast shipment, Strongly recommend!
element_e (verified owner) –
Delivery fast.And the machine runs well.
georgeamosx (verified owner) –
Works great, Recommend to all!
airp8883 (verified owner) –
responsive reseller
inaumenk (verified owner) –
Great reseller. Thank you
mad1984 (verified owner) –
delivery fast, Recommend
NiceAsicMiner79774760775 (verified owner) –
Works great, recommended seller!
perical (verified owner) –
recommended seller.
denis.vorobev.85 (verified owner) –
delivery fast, Recommend!
odi (verified owner) –
Excellent! will order again
carlmesservier (verified owner) –
all in order
n07b47m4n (verified owner) –
very helpful, recommended reseller.
igrozgal (verified owner) –
good! recommended reseller.
shura (verified owner) –
perfect! thanks!
alexwarsawa (verified owner) –
Perfect! Recommend!
freefrom (verified owner) –
excellent
denis.vorobev.85 (verified owner) –
component of very good quality …. consistent with the description. highly recommended seller. Thanks again for the fast shipping. I will test in 10 days I will come back to add a comment
allmotortech (verified owner) –
Works great, Recommend
bussiere.mathieu (verified owner) –
quick response, Recommend!
mike.fallen (verified owner) –
Perfect communication, Recommend to all!
alex7777_ca (verified owner) –
responsive reseller, Recommend to all!
stevegbarbour (verified owner) –
good! will buy again
carlmesservier (verified owner) –
the Miner is in excellent condition.
mahforand (verified owner) –
best seller. recommended
mgmb (verified owner) –
Awesome seller
dark0gf (verified owner) –
quick response, recommended reseller.
fviapiano (verified owner) –
He arrived very quickly and works well. I\’m satisfied with the article, although it had to be cleaned up, outside of it so far works well.
thewird (verified owner) –
good communication, recommended reseller.
erpenner (verified owner) –
Strongly recommend!
alex_k_87 (verified owner) –
All excellent. Thank you
lakins.c (verified owner) –
Quick delivery
thelastbroadcast126 (verified owner) –
best seller, Thank you
alexei52 (verified owner) –
Packing with meticulous
jbarkov (verified owner) –
A++++++++++++ Looks as on the picture
kiyashko.n.n (verified owner) –
Strongly recommend!
yulin-ev4 (verified owner) –
shipping fast, recommended
marshall (verified owner) –
Ok
antminerd316092017 (verified owner) –
responsive reseller, Recommend to all!
imsj.226 (verified owner) –
Very good item, will buy again
antminer6 (verified owner) –
Quick delivery, recommended
mhomchenko (verified owner) –
It\’s amazing, I\’ve bought it in different stores, this item is the best price, this is my fourth one, Working perfectly already has more than 2 weeks, recommend,
suvorovvitaliy (verified owner) –
best seller. Strongly recommend!
danny9 (verified owner) –
Works great, will buy again
exanerd (verified owner) –
Perfect! recommended
buchholz.richard (verified owner) –
Quick delivery, will buy again
larcev.y.v (verified owner) –
Thank you
seb.saucier (verified owner) –
Very Nice!
shillier (verified owner) –
very helpful, Strongly recommend!
bryan (verified owner) –
good miner, Recommend to all!
josh (verified owner) –
responsive seller, recommended seller!
nata05200 (verified owner) –
Perfect! Recommend
ya.underwhat (verified owner) –
Works ok cold
torpedadad (verified owner) –
recommended reseller.
rgodfredsen (verified owner) –
fast and trusted! recommended seller.
dolzhikoff.pawel (verified owner) –
best seller, will order again
skyhawk777 (verified owner) –
fast shipment, will order again
evr37iv (verified owner) –
The delivery was very fast, and the product is exactly as in the picture. I really recommend it! 🙂
backlove12 (verified owner) –
Quick delivery, Recommend to all!
ya.uraspb (verified owner) –
good seller! Thank you
rennychj (verified owner) –
thanks a lot, very good quality 🙂
jlw222 (verified owner) –
best item and Good seller thks