Bitdeer SealMiner A2 Pro Air 255TH/s

Description

We list this machine twice, and this is the priced one. The other listing is the A2 Pro 255T, December mix batch, which is quote-only. This page is the January batch. The published specification is the same on both — 255 TH/s, 3,790 W, 14.9 J/TH — so what separates them is batch and bin, not model. If you are comparing our price against another dealer’s, make sure you are comparing the same batch, and ask us on +1 (781) 577-0377 or ns@ingmining.com which one is physically in stock before you plan around it.

The Bitdeer SealMiner A2 Pro Air is the most credible non-Bitmain answer to the S21 class: 255 TH/s at 3,790 W, about 14.9 J/TH. Bitdeer designs its own SEAL-series silicon — the A2 generation runs the 4 nm SEAL02 — and mines with it at scale itself, which is a different proposition from a white-label rebadge. If you are shopping current-gen air-cooled hardware and only looking at Antminer, this belongs on the shortlist.

SealMiner A2 Pro Air specifications

Hashrate	255 TH/s ±5% (Bitdeer also sells a 260 TH/s variant of this machine)
Power consumption	3,790 W ±5%
Efficiency	14.9 J/TH ±5%
Algorithm	SHA-256 (Bitcoin)
Noise	75 dB
Dimensions	400 × 195 × 290 mm
Operating temperature	Up to 40 °C
ASIC chip	Bitdeer SEAL02, 4 nm (153 chips per hashboard on the A2)
Cooling	Air, 4 fans
Input voltage	220–277 V AC — will not run on 120 V
Power supply	Built into the chassis, rated 97% efficient
Manufacturer warranty	Bitdeer publishes 365 days from the shipment date — buyer pays shipping in for repairs, Bitdeer pays the return leg, and coverage is void if settings are changed without consent. This is a January batch unit, so part of that year is already spent — ask us for the shipment date and we will confirm what we cover in writing

What’s in the box

1 × Bitdeer SealMiner A2 Pro Air 255TH/s Bitcoin
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

Why the efficiency number is the only one that matters

14.9 J/TH against the used S19 fleet at 34.2 J/TH is not a marginal improvement — it is less than half the electricity for the same work. At scale that gap decides whether you survive a difficulty rise. The honest counterweight: a used S19 costs a fraction of this per machine, so if your power is cheap and your capital is tight, old iron still wins on return per dollar spent. If your power is expensive, it does not. Work out your own numbers at your own rate — we will not quote you a profitability figure, because it changes with difficulty and price every single day.

Power and siting

At roughly 3.8–4.05 kW this is a 240 V machine on its own circuit, and at 75 dB it is a warehouse or hosted-facility unit. Same chassis footprint as an S19, so existing racks and shelving carry over.

Parts and repair — read this before you buy

We could not find an independent supply of SEAL02 chips or a third-party shop advertising A2 hashboard repair. Bitmain’s BM1370 has both. In practice that means an out-of-warranty hashboard failure on this machine likely goes back to Bitdeer or becomes scrap, where an Antminer of the same class has a working aftermarket behind it. That is not a criticism of the hardware — Bitdeer designs its own silicon and mines with it at scale, which is a stronger position than a rebadge — but an aftermarket takes years to form and this one has not formed yet. Weigh it against the roughly 4% more terahash per dollar this machine gives you. We set the whole comparison out in S21 Pro vs SealMiner A2 Pro Air.

Condition

Listed as a January batch unit. Ask us to confirm the exact batch, whether it is sealed, and the remaining warranty coverage before you order — we will confirm it in writing.

Buying from ING Mining

We buy, repair, host and resell this hardware ourselves, so ask us the awkward questions before you order — power draw at the wall, board revision, what the fans sound like in a garage. Browse the rest of the catalogue at all miners.

14.9 J/TH puts this in the same efficiency band as an S21 Pro, which is the band that matters far more than the terahash figure. The buying guide has the break-even table by model and the formula behind it.

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 3,790 W it draws about 15.8 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 3,790 W running 24/7, this machine burns about 2,729 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 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?

The algorithm is SHA-256 (Bitcoin), 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.

Related hardware and where this sits in the store

Other Bitdeer SealMiner hardware:

Categories: Bitcoin miner, Bitdeer Miner, New ASIC miners and Air Cooling.

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.

New	Unused stock. Factory sealed unless the listing says otherwise — “new, open box” means exactly that, and the listing will say it.
Tested working	Second-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.
Refurbished	Tested 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 parts	Sold 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.
Untested	We 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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Bitdeer SealMiner A2 Pro Air 255TH/s Bitcoin Miner – 14.9 J/TH, January Batch

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Description

SealMiner A2 Pro Air specifications

What’s in the box