Antminer S21 XP IMM 300T - 300 TH/s Immersion Miner

Q: Will this run on a normal household outlet?

No. This machine needs a dedicated 342–418 V circuit. A North American 120 V household outlet will not run it under any adapter or configuration. That is a datacentre-class feed, not a building service: this machine will not run on 240 V at all, and there is no adapter or transformer arrangement that changes that. What we can state exactly is the load — about 5.5 kW continuous. We are deliberately not printing an amp figure or a breaker size here, because the current per line depends on whether your 342–418 V supply is single-phase or three-phase, and this listing does not state which the machine’s power supply takes. That is the number your electrician sizes the feed and the protection from, and it is not a figure to guess at. Tell us your service voltage and phase and we will work it through with you before you order. Have an electrician confirm the supply before the pallet arrives.

Q: Does it come with the tank and the fluid?

No. This unit’s cooling is listed as IMM — immersion: it is built to run submerged in dielectric fluid rather than air-cooled, so the tank, the fluid, the pumps and the heat-rejection loop are all things you build around it and none of them are part of this listing. What is physically included is the list in What’s in the box above. If you are pricing a first immersion build, ask us on +1 (781) 577-0377 or ns@ingmining.com before you order — the machine is usually the cheaper half.

Q: What will it cost to run?

That depends on your electricity rate, so here is the part we can state exactly: at 5,550 W running 24/7, this machine burns about 3,996 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 We do not publish profitability figures, because they change with difficulty and price every day.

Q: How loud is it?

<60 dB — about as loud as a busy office, and it does not stop. That is quiet enough to be liveable in a garage or utility room, though it still runs continuously.

Q: What can I mine with it?

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.

Q: 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.

Description

The Bitmain Antminer S21 XP IMM 300T is a high-performance Bitcoin miner delivering 300 TH/s with an energy efficiency of 18.5 J/TH. This IMM series miner is designed for professional miners who want reliable 24/7 operation and optimized power consumption. Additionally, its efficient cooling system ensures consistent performance and hardware longevity. Engineered by Bitmain, the S21 XP IMM 300T offers robust design, reduced heat output, and enhanced stability. For setup guides and performance optimization, you can visit Hashrate Index or read our own guide to power, cooling and firmware tuning.

Specifications

Model	Bitmain Antminer S21 XP IMM (300T)
Algorithm	SHA-256
Hashrate	300 TH/s ±3%
Power consumption	5,550 W ±5%
Efficiency	18.5 J/TH ±5%
Input voltage	342–418 V AC
Cooling	Advanced IMM cooling
Noise	<60 dB
Operating temperature	5°C–40°C
Network	Ethernet
Weight	Approx. 18 kg

This machine does not ship with its cooling system. What hydro and immersion cooling actually require sets out the loop, the heat load in BTU/hr and the published input voltage for every one of these units.

What’s in the box

1 × Bitmain Antminer S21 XP IMM
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

Each unit is tested and verified before ING Mining ships it, and it ships worldwide. Orders leave here within 7 business days, which is a dispatch time and not a delivery guarantee — the carrier owns the days after that, and on an immersion machine crossing a border, customs owns some of them too. Warranty is Bitmain’s rather than ours: Bitmain’s published warranty table gives BTC miners from the S19 generation onward 365 days from Bitmain’s own shipment date, subject to the sales contract (read 15 August 2026). How much is left on this one is a serial-number question; Bitmain’s serial-number warranty check answers it, and we will do that with you and put it in writing before you pay. This listing states no term of ours and none is implied. Customers rely on us for authentic ASIC miners and professional support. The S21 XP IMM 300T combines high hashrate, energy efficiency, and durability — perfect for large-scale mining farms and professional miners looking to maximize performance per watt.

Questions buyers ask about this machine

Will this run on a normal household outlet?

No. This machine needs a dedicated 342–418 V circuit. A North American 120 V household outlet will not run it under any adapter or configuration. That is a datacentre-class feed, not a building service: this machine will not run on 240 V at all, and there is no adapter or transformer arrangement that changes that. What we can state exactly is the load — about 5.5 kW continuous. We are deliberately not printing an amp figure or a breaker size here, because the current per line depends on whether your 342–418 V supply is single-phase or three-phase, and this listing does not state which the machine’s power supply takes. That is the number your electrician sizes the feed and the protection from, and it is not a figure to guess at. Tell us your service voltage and phase and we will work it through with you before you order. Have an electrician confirm the supply before the pallet arrives.

Does it come with the tank and the fluid?

No. This unit’s cooling is listed as IMM — immersion: it is built to run submerged in dielectric fluid rather than air-cooled, so the tank, the fluid, the pumps and the heat-rejection loop are all things you build around it and none of them are part of this listing. What is physically included is the list in What’s in the box above. If you are pricing a first immersion build, ask us on +1 (781) 577-0377 or ns@ingmining.com before you order — the machine is usually the cheaper half.

What will it cost to run?

That depends on your electricity rate, so here is the part we can state exactly: at 5,550 W running 24/7, this machine burns about 3,996 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?

<60 dB — about as loud as a busy office, and it does not stop. That is quiet enough to be liveable in a garage or utility room, though it still runs continuously.

What can I mine with it?

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.

Related hardware and where this sits in the store

Other immersion-ready hardware we stock:

Categories: Bitmain Antminer, Bitcoin miner, Immersion Cooling 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.

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

This listing is quoted rather than priced, and freight is quoted with it. Tell us where it is going and we will confirm the shipping cost to that address with the price, before you pay — on a multi-unit or pallet order that is the only honest way to do it.

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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