Refurbished Antminer S19 95TH/s - Braiins OS Tuned Unit

Description

One refurbished Antminer S19, factory-rated 95 TH/s and tuned toward 105 TH/s on Braiins OS. A single machine is the sensible way into this hardware. You find out what it genuinely costs you per month, how loud it genuinely is and what it does to the temperature of the room it lives in — all before that becomes ten of the same problem.

This machine is listed twice on this site, at two different prices. The other listing is the same refurbished Antminer S19 95TH/s with the same specification, and its web address is left over from an older lot listing. The two prices have not been reconciled. Ask us on +1 (781) 577-0377 or ns@ingmining.com before you order and we will confirm in writing which unit you would be sent and at which price.

Antminer S19 (base model) — Bitmain's published specification

Stock hashrate	95 TH/s ±5%, SHA-256
Stock power at the wall	3,250 W ±5%
Stock efficiency	34.2 J/TH by arithmetic (3,250 W ÷ 95 TH/s); Bitmain publishes 34.5 J/TH ±5%
Input voltage	200–277 V AC. This is not a 110 V machine and no adapter makes it one
ASIC chip	BM1398BB, 7 nm — 76 chips per hashboard, 228 per machine
Noise	~75 dB from 4 fans
Dimensions and weight	400 × 195.5 × 290 mm bare, 570 × 316 × 430 mm boxed. 14.2 kg net, 16 kg gross per unit — Bitmain’s published S19 specification (model 240-Ca). Freight is billed on the gross weight, not the net
Operating temperature	5–40 °C · Network: Ethernet RJ45
Generation	launched May 2020, so a unit sold today is around six years old

Two facts that end more first S19 purchases than any spec above

It takes 200–277 V AC. It will not run from a North American 110 V outlet in any configuration, no adapter or converter changes that, and this is the single most common reason a first miner goes back in its box. And it runs at roughly 75 dB on four fans — workshop noise, not appliance noise, and closer to a shop vacuum than to a computer. If this machine has to live where people sleep or work, an S19 is the wrong purchase and no amount of enclosure fixes it. Somewhere with 240 V, real airflow and nobody to annoy is the requirement.

What “boosted to 105 TH/s” costs you in watts

The metered draw at 105 TH/s is not stated in this listing, so no number is fabricated here. The floor is arithmetic: at the factory 34.2 J/TH, 105 TH/s would need 3,250 W × (105 ÷ 95) = about 3,592 W, and as overclocking worsens efficiency the true draw is higher again. At 240 V that is at least 15 A continuously from one machine — a dedicated circuit, sized with a continuous-load derate, not an extension lead from something else. Ask us to meter the actual unit and we will confirm the reading in writing.

Why the firmware boost is not free

Braiins OS tunes each chip separately rather than running the whole board at its weakest chip’s voltage. Held at the factory hashrate, that is a real efficiency gain. Spent on extra terahashes, as it is here, it goes the other way: power climbs faster than output, so a boosted machine is less efficient per terahash than a stock one. You are buying hashrate, not savings. Anyone telling you a boost also lowers the power bill is describing something the silicon cannot do. It also voids remaining manufacturer coverage, long expired on a 2020 machine.

What’s in the box

Sold refurbished and tested. This listing states no condition grade, no warranty term and nothing about whether a PSU is included, so this page asserts none of the three. On a single-machine purchase the PSU question is the one that bites: a bare miner and a complete one are very different buys. Ask us to confirm PSU, cord and plug standard, plus the return terms, in writing before you order.

Who should buy this

Someone who wants a cheap, real entry into SHA-256 mining, has 240 V available and somewhere loud to put it, and would rather learn the operational lessons on one unit than on ten. If it works out, the refurbished S19 lots are the obvious next step.

Questions buyers ask about this machine

Will this run on a normal household outlet?

No. This machine needs a dedicated 200–277 V circuit. A North American 120 V household outlet will not run it under any adapter or configuration. Have an electrician confirm the supply before the pallet arrives.

How loud is it?

~75 dB from 4 fans — 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 condition is it in, and what does that grade mean?

This is second-hand stock. We describe it the way we found it: tested working means it ran on our bench at the stated hashrate, refurbished means it was also cleaned, re-pasted or had parts replaced, and as-is means it is sold without a working claim. The grade for this unit is stated in the description above; where a listing states no grade, it says so rather than implying one. Cosmetic wear — dust, scratches, label marks — is normal on hardware that has been mining and is not a fault.

What should I check the day it arrives?

Photograph the pallet or box before you open it, keep the packaging, and run the 48-hour acceptance test straight away. Freight claim windows are short, and a fault found on day two is a conversation while a fault found on day thirty is an argument. Our own six-step bench procedure is published in full, so you can repeat exactly what we did.

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.

Is it worth repairing, and does used still win at this price?

$249.99 is roughly where a used S19 becomes worth fixing. The same tested-working S19 95 TH/s hashboard that is 37% of our cheapest S19 is 24% of this one — inside the one-third rule, so one dead chain on this machine is a $59.99 repair rather than a write-off. A tested ctrl_C55 control board is the same $59.99, and it is worth knowing that a dead control board presents exactly like three dead hashboards: no interface, nothing found. Half the machines that reach us described as having a dead board have a healthy one. Where it stops: the S19 Pro 110 TH/s board set at $169.99 is 68% of this miner, and an APW12-class 5,600 W supply at $349.99 is more than it is worth. Two chains down and you are buying another machine.

The boost changes the used-vs-new answer, and not in its favour. Tuning a 95 TH/s S19 toward 105 buys hashrate by spending efficiency — power climbs faster than hashrate on the voltage-frequency curve, so the machine’s break-even electricity price gets worse, not better. At $2.63 per terahash against $17.14 for a new S21 Pro 245T at $4,200 the capital case is overwhelming; the running case is the one that has to survive your power contract. used vs new ASIC miners sets out both gates, in the order they actually kill purchases.

Parts prices are our own shelf, read on 16 August 2026, and they are parts only — we do not publish a bench labour rate, so nothing here pretends to be a fitted price.

Related hardware and where this sits in the store

Other used and refurbished units currently on the floor:

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

Where this listing sits

This one is on the used and refurbished shelf. It is second-hand hardware. The grade for this specific unit is stated in the description on this page — and where a listing states no grade, it says so rather than implying one.

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: Used — second-hand stock. The grade for this unit is on the listing above, and where a listing states no grade it says so.

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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Antminer S19 95TH/s ASIC – Boost to 105TH/s (Braiins OS) – Refurbished

Price:

Description

Antminer S19 (base model) — Bitmain's published specification

Two facts that end more first S19 purchases than any spec above