Antminer S21+ Hyd (used)

Antminer S21+ Hyd (used)

395 TH/s / Batch November 2026 (1st–15th) / At home
65 299 Kč
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Antminer S21+ Hyd (used)
  • Antminer S21+ Hyd (used)
Antminer S21+ Hyd (used)

Bitmain · SHA-256

Antminer S21+ Hyd (used)

Mines approx. 310 Kč per day ≈ 9299 Kč / month
0.000177 BTC / day · before electricity costs · exchange rate and network difficulty as of 24 Oct, 21:59 Calculate profit after electricity
53 966 Kč excl. VAT
65 299 Kč incl. 21% VAT
Where will the miner run
Delivery
Factory pre-order We pay the manufacturer the full amount upfront. Choose how you would like to pay.

You pay the full amount of 65 299 Kč incl. VAT when ordering.

  • The date reflects the factory production date plus a few days for shipping and customs.
  • We set up the miner free of charge to mine into your wallet.
How the pre-order works
  1. You order online and receive an invoice – for the full amount or for a 50% deposit (price +2%).
  2. Once we receive payment, we order from the manufacturer.
  3. As soon as the miner has a tracking number, we let you know. With a deposit, you pay the rest at that point.
  4. You collect the miner in Prague, we ship it to you, or we connect it straight away on our hosting.
Hashrate395 TH/s
Delivery
Operation

What it can mine

Gross revenue before electricity, based on today’s difficulty and exchange rate. Coins without an amount are not calculated yet.

Suitable for

  • Hosting
  • Workshop – with a water loop
  • Flat – needs a cooling loop
Full description, video and specifications
395 TH/sHashrate – mining power
5925 WPower draw at the wall
15.0 J/THEfficiency – lower is better
HydroCooling
50 dBNoise level – like a quiet office
Rows of ASIC miners in a data centre Current hosting prices · 22/10/2026
PC Praha hosting

Let it mine with us

The miner goes from the supplier straight to the data centre. We connect it and look after it; you just follow the earnings.

  • from 1.14 Kč/kWhelectricity incl. management · with prepayment up to −30%
  • 7-year warrantywhile the miner runs with us (at home 1 year)
  • 7 data centresto choose from, uptime up to 99.85%
  • 0 dB at home50 dB of noise stays in the data centre

Technical specifications

Manufacturer
Bitmain
Algorithm
SHA-256
Coins
Bitcoin, Bitcoin Cash, Bitcoin SV, DigiByte, eCash, Fractal Bitcoin, Quai
Hashrate
395 TH/s
Power draw
5925 W
Efficiency
15.0 J/TH
Cooling
Hydro
Noise level
50 dB
Power supply
380–415 V, 3-phase
Condition
Used with warranty
Warranty
12 months · 84 months when hosted with us

How much it earns

Enter your tariff. The default value is an example.

Revenue per day
Electricity per day
Profit per day

Revenue based on the current network difficulty and exchange rate, updated 24/10/2026 21:59. We use today’s revenue. In reality it changes with network difficulty, the exchange rate and halvings, so treat multi-year figures as indicative. Pool fees are not included.

  • Personal collectionPrague 10
  • ASIC miner repairsright here in Prague
  • Pay by bank transfer or in cryptoBank transfer (CZK / €), USDT/USDC or cash at the shop
  • VAT invoicereverse charge for EU businesses

Description

Antminer S21+ Hyd from Bitmain is a water-cooled (hydro) miner for the SHA-256 algorithm (Bitcoin). We offer used units with a remaining Bitmain manufacturer warranty of 2 months. Delivery from Hong Kong in the first half of November 2026. New units can be found on the Antminer S21+ Hyd page.

Hashrate 395 TH/s at a power draw of approx. 5925 W (15 J/TH). The machine needs a water loop with a dry cooler and a three-phase 380–415 V supply. At home it can also be used for heating via the water loop, but it most often runs in a data centre – with us you can run it straight away in our hosting.

Specifications

  • Algorithm: SHA-256 (Bitcoin, Bitcoin Cash, Bitcoin SV, eCash)
  • Hashrate: 395 TH/s
  • Power draw: approx. 5925 W
  • Efficiency: 15 J/TH
  • Cooling: water (hydro)
  • Power supply: 380–415 V, 3-phase
  • Condition: used, 2-month Bitmain warranty

Use the calculator on this page to estimate current returns at your electricity price.

Setup guide

We will set it up for you free of charge. Send us your wallet address and the miner will mine for you alone. If you do not have a wallet yet, we will help you create one.

Setting up an Antminer (Bitmain) miner
  1. Connect the network first, then the power. Connect the miner to your router with a network cable, on the same network as your computer. Only then switch it on.
  2. Find the IP address. Download the official Bitmain IP Reporter, run it and press the IP Report button on the miner – the address will appear in the program. You can also find it in your router’s list of devices.
  3. Log in. Enter the IP address in your browser and log in with the default username and password root / root. Then change the password.
  4. Set up the pool. In the pool settings (Miner Configuration), enter the pool address in the form stratum+tcp://…; as the Worker, enter your pool account name or wallet address, a full stop and the machine name (e.g. account.miner1), and x as the password. Save.
  5. Check that it is mining. After a few minutes the miner will start mining. You can check the hashrate on the pool’s website.

Switch on Hyd (water-cooled) and Imm (immersion) models only after connecting them to the cooling circuit.

Nastavení poolu v ovládacím panelu Antmineru

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