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Bitmain Antminer S21 Pro 234T – Efficient SHA-256 ASIC Miner

Bitmain Antminer S21 Pro 234T – Efficient SHA-256 ASIC Miner

$4,200.00
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$399.99
Bitmain Antminer S21 XP 270T – Efficient Bitcoin Miner

Bitmain Antminer S21 Pro 245T – Efficient Bitcoin Miner

Antminer S21 Pro 245T: 245 TH/s at 3,675 W, 15.0 J/TH, BM1370 chip, 220-277 V with the PSU built in. Air-cooled at around 75 dB, so it is a facility machine rather than a home one.

Price:

$4,200.00

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Buying from ING Mining

  • Ships UPS Ground from the US — $49.99 on this item. Orders ship within 7 business days.
  • Condition: New — as described on this listing.
  • Tested before listing. The six-step bench procedure a machine goes through here is published in full.
  • Warranty and returns are stated per unit, not per store. Any warranty term for this machine is in the description above. Ask us for the return terms on this exact unit before you pay.
  • Questions? +1 (781) 577-0377 or ns@ingmining.com — who we are.
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  • All Machines Are Fully Tested, Cleaned, & Dusted
  • Money Back Guarantee for 30 Days
  • Shipping via UPS Ground with 3-day handling

Description

The Antminer S21 Pro 245T is Bitmain’s high-hashrate air-cooled SHA-256 machine: 245 TH/s at 3,675 W, which is 15.0 J/TH. All three S21 Pro variants (220T, 234T and 245T) share that same 15.0 J/TH efficiency — the bigger models simply run more silicon harder, they are not more efficient per terahash.

Key specifications

  • Algorithm: SHA-256 (Bitcoin, Bitcoin Cash)
  • Hashrate: 245 TH/s ±3%
  • Power consumption: 3,675 W ±5%
  • Efficiency: 15.0 J/TH
  • Chip: Bitmain BM1370
  • Input voltage: 220–277 V AC — will not run on 120 V
  • PSU: built into the chassis, no separate power supply to buy
  • Cooling: air — published fan counts disagree for this model, with both two and four quoted
  • Noise: roughly 75–76 dB
  • Max operating temperature: 45 °C
  • Manufacturer: Bitmain

Published weights, dimensions and even fan counts for this model vary between sources (both 400 × 195 × 290 mm and 450 × 219 × 293 mm are quoted, and both two and four fans). If you are booking freight or building racking, ask us and we will measure and weigh the actual unit rather than repeat a spec sheet.

What 15 J/TH means for your power bill

At 15.0 J/TH this machine covers its own electricity only below roughly 8.6 ¢/kWh at July 2026 hashprice. That is the number that decides whether it makes sense for you, and it has nothing to do with the terahash figure. Our ASIC miner buying guide gives you the one-line formula so you can check it against your actual power contract. We do not quote profitability figures, because they change with difficulty and Bitcoin price every day.

Power and siting

3,675 W on a dedicated 220–277 V circuit, and around 75 dB. This is a warehouse or hosted-facility machine, not a home one. If you want something you can live beside, the Avalon Q is the honest recommendation instead.

Repairability

The BM1370 has a real independent parts market and S21-family hashboard repair is a service several shops advertise, which is a genuine advantage over newer non-Bitmain hardware. We stock Antminer repair parts, testers and fixtures ourselves.

Buying from ING Mining

Bitmain publishes a 365-day warranty running from the shipment date, and it runs to the original direct purchaser — on a resold machine, support is the reseller’s responsibility. Ask us what we will cover and for how long, and we will confirm it in writing before you order. Compare it against the Bitdeer SealMiner A2 Pro Air, or browse Antminer and the full catalogue at all miners.

At 15 J/TH, an S21 Pro covers its own electricity only below roughly 8.6¢/kWh at July 2026 hashprice. Our ASIC miner buying guide gives you the one-line formula so you can check that against your actual power contract before you order.


Cross-shopping this against the Bitdeer SealMiner A2 Pro Air? The two are within 1% of each other on efficiency, so the decision comes down to parts, warranty and resale. We put both side by side in S21 Pro vs SealMiner A2 Pro Air.


Related hardware and where this sits in the store

Other air-cooled Antminer hardware at a similar duty:

Categories: Air Cooling, Antminer BTC Miners, Bitcoin miner and New ASIC miners. Or browse the full ASIC miner inventory.



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.

How this unit was tested

A used-hardware seller who will not tell you how they test is asking you to take the grade on trust, so the procedure is public: the six-step bench procedure a machine goes through before it gets a grade and a listing, 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 arrives, run the 48-hour acceptance test before the freight claim window closes.

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.

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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