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Bitmain Antminer S21+ 235T | High-Performance SHA-256 Miner

Ten Antminer power supply units arranged in two rows on a speckled shop floor.

Bitmain Antminer S21+ 216T – Efficient SHA-256 Bitcoin Miner

The Bitmain Antminer S21+ 216T offers ~216 TH/s hashrate with ~3,564 W power consumption in the SHA-256 algorithm. Ideal for Bitcoin & BCH mining. Available now at ING Mining.

Price:

$4,200.00

Key specifications

Hashrate
~216 TH/s ±3%
Power draw
~3,564 W ±5%
Efficiency
~16.5 J/TH
Input voltage
220-277 V AC range
Noise
~75-76 dB
Algorithm
SHA-256
Full specification table
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Buying from ING Mining

  • Shipping$49.99 UPS GroundThe rate the checkout will charge on this item, read from the store’s own shipping settings rather than estimated. Ships from the US within 7 business days.
  • ConditionNewAs described on this listing.
  • GradingGraded before listingThis unit’s own grade is in the description above — where a listing states none, it says so. The six-step bench procedure behind a grade is published in full.
  • WarrantyStated per unit, not per storeAny term for this machine is in the description above. Ask for the return terms on this exact unit before you pay — full terms are in the Shipping & buying tab below.
Questions+1 (781) 577-0377 or ns@ingmining.com — who we are

Sold by ING Mining LLC — ING MINING® is a registered U.S. trademark.

Live Chat
  • Condition graded per unit: new, tested working, refurbished or as-is
  • Warranty and returns stated per unit, not per store
  • Ships UPS Ground within 7 business days

Description

The Bitmain Antminer S21+ 216T is a high-performance SHA-256 ASIC miner designed for mining Bitcoin (BTC) and Bitcoin Cash (BCH). With a typical hashrate of approximately 216 TH/s and power consumption around 3,564 W, this miner combines speed and efficiency to deliver top mining value. Built by Bitmain, the S21+ features advanced cooling, robust hardware, and optimized firmware for long-term performance. Its compact physical size (~400 × 195 × 290 mm) and manageable weight make it suitable for both medium-scale setups and larger mining farms.

Specifications

Model Antminer S21+ 216T
Algorithm SHA-256
Coins mined Bitcoin (BTC), Bitcoin Cash (BCH)
Hashrate ~216 TH/s ±3%
Power consumption ~3,564 W ±5%
Efficiency ~16.5 J/TH
Input voltage 220-277 V AC range
Noise ~75-76 dB
Dimensions ~400 × 195 × 290 mm

What’s in the box

  • 1 × Antminer S21+ 216T
  • Nothing that is not listed above. Cords, controllers, brackets and spares are only included when this listing names them — if you need to know before you pay, ask on +1 (781) 577-0377 or ns@ingmining.com and we will confirm in writing what is physically in the crate

If you’re looking to scale your Bitcoin mining operation or upgrade to a next-level rig, the Antminer S21+ 216T delivers performance, reliability and efficiency. Order from ING Mining’s verified inventory for genuine units and fast shipping. Want to review current mining profits and network conditions? Check out the official data on ASIC Miner Value – S21+ and monitor Bitcoin network stats for informed decisions. *Performance may vary depending on power quality, cooling condition and firmware version. Values are typical and subject to change.*

Questions buyers ask about this machine

Will this run on a normal household outlet?

No. This machine needs a dedicated 220–277 V circuit. A North American 120 V household outlet will not run it under any adapter or configuration. At 3,564 W it draws about 14.8 A at 240 V, so the circuit wants a 20 A breaker — continuous loads are sized at 125% under the NEC, and a miner is the textbook continuous load. Size for your actual supply voltage, not ours: the same load on a 208 V feed draws more current, not less. Have an electrician confirm the supply before the pallet arrives.

What will it cost to run?

That depends on your electricity rate, so here is the part we can state exactly: at 3,564 W running 24/7, this machine burns about 2,566 kWh a month. Multiply that by your own all-in rate per kWh — including delivery charges, not just the supply rate — to get your monthly power bill. We do not publish profitability figures, because they change with difficulty and price every day.

How loud is it?

~75-76 dB — about as loud as a household vacuum cleaner running continuously, and it does not stop. This is a garage, workshop, outbuilding or hosted-facility machine, not something to put in a room where people live or sleep.

What can I mine with it?

It mines Bitcoin (BTC), Bitcoin Cash (BCH). The algorithm is SHA-256, and ASIC silicon is single-purpose: it will mine coins on that algorithm and nothing else, whatever the price of anything else does.

Is this a new unit?

Yes — new stock, as described in this listing. Any manufacturer warranty term that applies is stated in the description above; where none is stated, none is claimed.

Shipping cost for this exact item, and how warranty and returns work here, are answered in the Shipping & buying tab on this page. Anything else, ask a person on +1 (781) 577-0377 or ns@ingmining.com — we would rather talk before you buy.

What 16.5 J/TH means for your power bill

3,564 W is 2,602 kWh a month at 730 running hours — $182 at 7¢/kWh hosting, $480 at the 18.44¢/kWh US residential average. At 16.5 J/TH the S21+ 216T covers its own electricity only below roughly 8.1 ¢/kWh, taken at the $32.09/PH/day hashprice of 10 August 2026; hashprice moves daily with difficulty and price, so re-run it on the day you buy. That break-even is the whole practical difference between this machine and the 15 J/TH S21 Pro 245T beside it — same generation, same 220–277 V feed, about eight tenths of a cent less headroom on your power price. The ASIC miner buying guide has the formula, the hosting comparison and the break-even table by model. We do not publish profitability figures.

Related hardware and where this sits in the store

Other air-cooled Antminer hardware at a similar duty:

Categories: Air Cooling, Bitmain Antminer, Bitcoin miner and New ASIC miners.




Where this listing sits

This one is on the new shelf. New stock, as described in the listing. Any manufacturer warranty term that applies is named in the description; where none is named, none is claimed.

What our grades mean

These are the only words we use, and each one means a specific thing. They are not interchangeable and we do not soften them to move stock.

NewUnused stock. Factory sealed unless the listing says otherwise — “new, open box” means exactly that, and the listing will say it.
Tested workingSecond-hand, and it ran on our bench at the hashrate the listing states. We measured it; we are not repeating what the last owner told us. Expect cosmetic wear.
RefurbishedTested working, plus work done: cleaned, thermal paste and fans dealt with, failed components replaced. The listing says what was actually done to that unit rather than using the word as decoration.
As-is / for partsSold with no working claim at all, at a price that reflects it. Buy these to repair or to harvest. If a listing says as-is, assume it does not hash until you have proved otherwise.
UntestedWe have it, we have not powered it, and we are not going to pretend we did. Rarer than as-is and always stated explicitly.

What a grade here does not mean

  • Cosmetic wear is not a fault. Dust, scratches, scuffed labels and discoloured plastics are normal on hardware that has been earning. We photograph what we have; if the pictures matter to you, ask for more and we will take them.
  • A grade is not a warranty. Warranty terms are stated per listing, never per store — see the Shipping & buying tab. A tested-working grade describes what the machine did on our bench, not what we owe you in six months.
  • A boosted hashrate is not a spec. Where a unit ships on tuned firmware we say so and we give the factory figures too, because overclocking raises power faster than it raises hashrate — a tuned machine is less efficient per terahash than stock, not more.
  • We will not invent a grade to fill a field. If a unit came in without history and has not been through the bench, its listing says that.

How the grade gets decided

A used-hardware seller who will not tell you how they test is asking you to take the grade on trust. Ours is published: the six-step bench procedure every machine goes through, and the five measurements that get recorded — per-board hashrate, chip count, measured wall power rather than the nameplate figure, hardware error rate, and temperature under sustained load. When it reaches you, run the 48-hour acceptance test straight away, while the freight claim window is still open.

Buying second-hand for the first time? How to buy a used ASIC miner without getting burned is the long version, written from the repair bench rather than from a spec sheet.

Shipping

Shipping this item inside the United States costs $49.99 by UPS Ground — that is the rate the checkout will charge, read from the store’s own shipping settings, not an estimate. Orders ship within 7 business days.

Outside the United States the checkout quotes a flat international rate. On multi-unit or pallet orders, contact us before ordering so freight to your destination can be confirmed properly. What to check when the pallet arrives, and how a freight claim works, is covered in the mining hardware shipping guide.

What to do the day it arrives

Photograph the pallet or the box before you open it, and keep the packaging until you are satisfied. Freight claim windows are short, and damage found on day two is a conversation while damage found on day thirty is an argument.

Then run the 48-hour acceptance test straight away, while that window is still open. It is the same ground our own bench covers, so you can compare like for like: how the grade on this listing was arrived at, and the five measurements we record, are set out in the Condition & grading tab on this page.

Condition, warranty and returns

Condition: New — as described on this listing.

Warranty is stated per listing, not across the catalogue. Some units carry a manufacturer term and say so above, naming the term and the date it runs from. Many units, particularly used and AS-IS stock, carry none, and those listings do not claim one. There is no blanket warranty covering a catalogue that runs from sealed factory stock to a hashboard sold for parts. For what a mining warranty normally covers, see ASIC miner warranty explained.

Returns: ask for the terms on this unit before you pay. No single returns window is published for the whole store, because the sensible terms on a tested working machine and on a board sold AS-IS for parts are not the same terms. Email or call and ask what applies to this exact item — it is a two-minute conversation and a great deal cheaper than a dispute.

Where you are going to run it

Two questions decide whether a machine like this works where you live, and neither of them is about the miner: can the circuit carry it, and what does your electricity cost? Most full-size machines here want a dedicated 240 V circuit and run at 70–75 dB continuously. A few do not — the Avalon Q publishes 45–65 dB and runs on 110–240 V — so read the voltage and noise figures on this listing rather than assuming. ASIC miner power requirements covers breaker sizing and what the install actually involves; cooling covers where the heat and the noise end up.

If your power is not genuinely cheap, hosting is the question to be asking instead of which miner to buy. Break-even electricity rate is hashprice divided by (24 × J/TH), and hashrate cancels out of it entirely — which is why a cheap old machine on expensive power loses money faster than an expensive new one does. The buying guide has the arithmetic; work out your own number before you buy anything.

If hosting is the answer, get written answers on three things before you sign: who pays for repairs, what the uptime commitment actually pays out when it is missed, and how curtailment is handled. A flat per-machine monthly rate is where most of the unpleasant surprises live. Types of mining farm compares the models and hosting versus cloud mining covers why owning the hardware is the better end of that trade. Ask us before you commit — it is a five-minute call and a great deal cheaper than a contract you cannot get out of.

What we do once it is racked, wherever that is. Deployment, firmware and monitoring are a service we run rather than a line on a page: pool and network setup, Braiins OS or VNish tuning, offline alerts, and board-level fault-finding when a machine stops hashing — ASIC mining consulting sets out what that covers. The hosting agreement itself is between you and the facility. What we can give you is the number most hosting disputes turn on: what this machine measured at the wall on our bench, so a shortfall on site is a figure to compare against rather than an argument about what it should have been doing.

Who you are buying from

ING Mining LLC, Hanson, Massachusetts. ING MINING® is a registered U.S. trademark; our marketplace feedback is on the reviews page and the longer version of who we are is on about. Reach a person on +1 (781) 577-0377 or ns@ingmining.com.

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