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Antminer S21+
  • New from the factory — never used
  • Burned in by our engineers before launch
  • Serial-tracked to your account
  • In our racks
  • New from the factory

Antminer S21+

The Antminer S21+ (S21 Plus, S21+ 216T) by Bitmain. Mining for you as soon as tomorrow — and everything it mines settles toward your own wallet.
Speed variant — factory-graded, same efficiency
A faster unit mines more and draws proportionally more power. There's no wrong door — let the budget decide.

From click to first settlement

  1. Today

    You pick, we handle the rest

    Checkout takes minutes — cards, PayPal or crypto. No setup, no cables, no noise in your life.
  2. As soon as tomorrow

    It starts hashing

    Cloud allocation goes live in ~24 h; a Hosting unit follows its delivery window. Watch it all on the dashboard: hash rate, mode, output — live.
  3. Then, daily

    Rewards head your way

    The pool settles on its daily cycle toward a wallet only you control. Electricity bills from your prepaid balance.
Launch in ~24 h applies to Cloud Infrastructure. Hosting units ship to our data center on the option you pick: Express (air) ≈ 20–30 days, Saver (ground) ≈ 45–60 days — estimated transit windows, carrier-dependent, exact at checkout.

The four numbers that matter

  • 216 TH/sHash rate — the workforce
  • 16.5 J/THEfficiency — modern silicon class
  • 0.000109 BTCEst. output / day, before fees & power
  • 3.6 kWPower draw — billed daily as electricity

Stress-test it yourself

No forecasts from us — you set the Bitcoin price, the machine shows its math in both modes at once. The green flag is the story: watch how far the ECO line sits below the MAX line.
$78 000
ECO line$35 414
MAX line$59 024

MAX mode24/7 mining

Est. output / day
0.000109 BTC
≈ fiat at your price
$8.48
Rate / kWh
$0.075 → from $0.060
Electricity / day
$6.42 → from $5.13

ECO modeCheap-energy windows

The Cuverse switch
Est. output / day
0.000065 BTC
≈ fiat at your price
$5.09
Rate / kWh
$0.045 → from $0.040
Electricity / day
$2.31 → from $2.03
The survival lines: on MAX this machine out-mines its bill while BTC stays above ≈ $59 024; in ECO windows the line drops to ≈ $35 414 — the same machine, staying sensible 40% deeper into a rough market. On flat-rate hosting there is no second line — below the MAX line the only lever is the off button. Here, the same machine slides into ECO windows and keeps stacking. The switch is one tap on your dashboard.
An interactive what-if under your control — not a forecast, projection, or promise. Output at the current network reward rate before pool fees; electricity at standard rates ($0.075/kWh MAX · $0.045/kWh ECO windows, ~60% duty modelled); current rates at checkout prevail. "From" rates and figures reflect top-tier loyalty cashback (20% MAX / 12% ECO, in points); newcomer tiers start lower and grow with activity — see the Loyalty program. Survival lines use base rates.

The commercial terms, at a glance

Payment
100% at checkout — cards, PayPal, or crypto. No card details ever touch Cuverse.
Electricity
Billed daily from your prepaid balance, rate shown at checkout. Loyalty returns up to 20%.
Warranty & repairs
Cloud: parts & labour included, full 36 months. Hosting: 12-month warranty (+12/+24 at checkout); out-of-warranty repairs billed.
Delivery (Hosting)
Saver ground ≈ 45–60 days, included · Express air ≈ 20–30 days, +$149/unit. Cloud: nothing ships.
Import duties
Machines ship to our data centers, not your door — import formalities stay on our side of the rack.
End of term
Extend · trade in · sell back · take it home. It never becomes ours.

Papered properly

No handshakes: every purchase comes with its paper trail, start to finish.
  • A written agreement per purchase — full Hong Kong legal entity details inside
  • Invoice and payment receipt at checkout, whatever the payment method
  • The machine is assigned to your account — serial-tracked on Hosting
  • Every document lives in your dashboard, downloadable anytime

The same box, two very different lives

A marketplace boxThe same machine, here
Getting startedCustoms, freight, 3-phase power, 75 dB in your spaceRacked and hashing as soon as tomorrow — you click, we do the physical part
If it breaksRMA shipping across the world, weeks offlineRepaired meters from the rack by on-site engineers
Running costResidential electricity, your cooling problemIndustrial-rate power, MAX & ECO modes, cashback up to 20%
Your BitcoinDepends on your setupPool settles toward a wallet only you control — structurally non-custodial

The market moves. The machine keeps up.

Mining gets more competitive every year — here's what's already built in, so you don't have to think about it.
  • Curated silicon

    We stock only what lasts

    The racks carry the modern efficiency class — machines chosen to stay relevant, not to fill a shelf. The choosing is our job.
  • The ECO switch

    Two economies in one box

    Conditions tighten? One tap moves the machine into cheap-energy windows and keeps it working — the stress-test above shows how much room that buys.
  • The trade-in doorway

    Upgrades are built into the term

    When the next generation lands, trade in toward it — your machine's value rolls forward instead of aging in place.

Not this one?

Everything that comes with it — in plain words

  • Your Bitcoin never sits with us

    The mining pool settles toward a wallet only you control — save the address once, withdraw on your schedule. We hold no keys and no coins; that's the architecture, not a policy.
    How the money flows

  • MAX & ECO — two machines in one

    MAX runs 24/7 at the standard rate; ECO mines only in cheap-energy windows at a lower rate. You switch anytime from the dashboard — the stress-test above shows exactly what each mode means at any price.
    The full mode math

  • Pools: presets, or bring your own

    F2Pool by default, ViaBTC and Antpool one click away — or point the machine at your own pool with Custom Pool. Your machine, your economics, your call.
    Mining pools

  • Protected while it runs

    24/7 telemetry watches every board; on-site engineers respond in minutes, not shipping weeks. Repairs happen meters from the rack, under warranty.
    How uptime is protected

  • Loyalty: the longer you mine, the less power costs

    Five tiers recalculated daily; cashback lands as points (1 point = $1) and points pay the same bills they came from, or go toward your next machine. Up to 20% back at the top.
    The loyalty program

  • The term is a doorway, not a wall

    At the end: extend, trade in toward a newer model, sell back (case by case, at then-current market terms), or take the machine home. Do nothing and it waits in storage — it never becomes ours.
    Hosting vs Cloud

For the curious

  • Full specifications — Antminer S21+

    Hash rate
    216 TH/s
    Efficiency
    16.5 J/TH
    Power consumption
    ≈ 3,564 W
    Algorithm / network
    SHA-256 · Bitcoin
    Cooling
    Air, dual fan
    Noise level
    ≈ 75 dB — data-center territory, not living-room
    Release
    2025, Bitmain
    Mining pools
    F2Pool (default) · ViaBTC · Antpool · or your own via Custom Pool
    Runs in
    Cuverse data centers — 5 sites, 5 continents

  • Our take: Antminer S21+ vs S21 Pro vs S21 XP

    Every miner generation has one machine that hits the balance point, and in the S21 family it's the S21+: the full modern 16.5 J/TH efficiency class without the flagship price of the XP line. That efficiency is not a vanity number — it's the share of the machine's work that survives the power bill, and it's what keeps a unit relevant as network difficulty grows year after year.

    Against its neighbours: the Antminer S19k PRO costs a third as much but spends 40% more energy per terahash — a machine for the cheapest possible entry, not the long run. The Antminer S21 Pro and S21 XP squeeze out more terahash per watt at a visibly higher ticket. The S21+ is where most of our procurement keeps going back.

    In our racks it runs on data-center power and cooling, switches between MAX and ECO from your dashboard, and settles everything it mines toward a wallet only you control — from as soon as tomorrow.

Fair questions about the Antminer S21+

  • Factory-graded speeds of the same machine: efficiency is identical, so a faster unit simply mines more and draws proportionally more power. Let the budget decide — there's no wrong door.

  • Speed vs. specificity. Cloud: allocated from the live fleet, hashing in ~24 h, 36-month term, parts & labour covered throughout, nothing ships. Hosting: a new unit of exactly this model, delivered to our data center by air (≈ 20–30 days) or ground (≈ 45–60) and racked under your name — or, if it's in our racks already, hashing in ~24 h; 12-month term, warranty extendable, take it home at the end if you like. Same dashboard either way.

  • It draws about 3.56 kW — roughly 86 kWh a day. At the standard MAX rate of $0.075/kWh that's ≈ $6.42 a day, about $196 a month — electricity, hosting and maintenance all in that one number, billed daily from your prepaid balance. On ECO (cheap-energy hours, $0.045/kWh) it's ≈ $2.31 a day, about $70 a month. The exact rate for your region shows at checkout; the stress-test puts this draw side by side with the machine's output.

  • The machine keeps mining Bitcoin either way — what changes is the fiat math. You hold the levers: switch to ECO to cut the power bill, keep stacking through the dip, or pause and decide. The stress-test shows exactly where each mode stands at any price. No promises — just controls.

  • About 75 dB — a vacuum cleaner that never stops, which is why it lives in a data center and not your hallway. You see everything that matters on the live dashboard: hash rate, output, mode, telemetry.

  • Your call, four ways: extend, trade in toward a newer model, sell back (case by case, at then-current market terms), or take it home. Do nothing and it waits in storage — it never becomes ours.

Tomorrow, it could be hashing for you

New from the factory, racked by our engineers, settling toward your own wallet.
Or try a week for $19

Disclaimer. Prices, variant availability, delivery options, and rates are as of the page date — current listings at checkout prevail. Estimated output assumes the stated hash rates at a network reward of about 0.0000005 BTC per TH per day, before pool fees and electricity; network difficulty and the Bitcoin price change continuously. The stress-test is a what-if tool under the reader's control and is not a forecast, projection, or promise of any result; the difficulty chart is an indicative historical shape (live data on the production page) and implies nothing about the future. ECO-mode modelling assumes ~60% duty at the ECO rate; actual windows vary by site and season. Delivery windows are estimated transit times, carrier-dependent. Warranty extension pricing is indicative pending final rates. Specifications are from the manufacturer's datasheet, may vary by batch, and marked figures require verification before publication. Warranty, end-of-term options (buyback case by case at then-current market terms), loyalty, and trial terms are governed by the applicable documents. Nothing here is an offer, financial advice, or a promise of any result.