Hong Kong HQ · Worldwide shipping to the USA, Canada, Europe & 100+ countries

+852 4719 3309
Bitcoin Mining Depot logoBitcoinMining Depot
Used Bitmain Antminer S21+ 235 TH/s – 7 Months Runtime 235 TH/s SHA-256 ASIC miner at 3956W — Bitmain Used unit for sale at Bitcoin Mining Depot

Bitmain

Used Bitmain Antminer S21+ 235 TH/s – 7 Months Runtime

Used Antminer S21+ 235 TH/s bitcoin miner in good condition with roughly seven months runtime – modern 16.8 J/TH efficiency at a used price.

$1,760In Stock
Hashrate
235 TH/s
Power draw
3956W
Efficiency
16.8 J/TH
Algorithm
SHA-256
Condition
Used
  • Warranty backed and bench-tested before dispatch
  • Insured worldwide freight with pre-filled customs paperwork
  • In-house repair lab for the life of the machine

Questions about this model? Call +852 4719 3309 or email sales@bitcoinminingdepot.com.

Product overview

Used Bitmain Antminer S21+ 235 TH/s – 7 Months Runtime — in stock now at Bitcoin Mining Depot and shipped worldwide from our Hong Kong facility. This listing is near-new S21+ efficiency after only seven months of monitored operation, and the exact machine you see in the photos is the machine we ship. Every unit is opened, cleaned, benched under sustained load and logged against its serial number before it is released for dispatch.

Performance and specifications: this Bitmain miner runs the SHA-256 algorithm at 235 TH/s while drawing about 3956W at the wall, for a rated efficiency of 16.8 J/TH. It mines BTC / BCH. Efficiency is the number that decides whether a machine survives the next difficulty increase, so compare 16.8 J/TH against your own electricity rate before ordering — our desk will run the break-even model with you if you send your power cost and pool fee.

Infrastructure requirements: plan for a 200-240V supply, strong intake and exhaust airflow, dust filtration and somewhere that tolerates industrial fan noise — a garage, outbuilding, container or hosted rack. If you do not have suitable space, our hosting programme can run this unit for you with power, cooling, monitoring and remote reboots included.

Condition and testing: this unit is graded Used. Runtime, uptime history and hashboard health from the previous facility are documented, and the unit was inspected on arrival at our Hong Kong bench. Refurbished stock carries a limited hashboard and PSU warranty, and used stock ships with a functional-on-arrival guarantee plus a 180-day service window through our in-house repair centre.

Who it suits: value-focused buyers who want current-generation efficiency at the lowest capital cost. Wholesale pricing applies from five units upward, and multi-unit orders are consolidated onto one freight booking to cut shipping cost per machine.

Shipping and payment: worldwide delivery to the USA, Canada, Europe and Asia with DDP options available, express transit typically 7-14 days, and dispatch within 24 hours of cleared payment. Pay in Bitcoin, USDT or another supported cryptocurrency at checkout, or message our team on WhatsApp for a same-day quote and a testing video of the exact unit.

What is included

  • Miner unit with original manufacturer packaging
  • Matched power supply where applicable
  • Bench test report with measured hashrate
  • Warranty registration and RMA instructions
  • Pool and firmware configuration guidance
  • Access to our technical support desk 24/7

How to set up the Used Bitmain Antminer S21+ 235 TH/s – 7 Months Runtime — step-by-step guide

Follow these steps in order to go from delivery to a live, hashing machine. Most deployments are online the same day, and our support desk will stay on the call with you until the miner hits its rated hashrate.

  1. 1. Confirm site power before delivery

    Provision a dedicated 200–240V circuit per unit with 20% breaker headroom and a PDU rated for continuous load — a standard residential outlet cannot run this machine.

  2. 2. Rack the unit with clean airflow

    Mount the miner with unobstructed intake and exhaust, keep intake air below 35°C, and run negative-pressure exhaust so hot air is never recirculated.

  3. 3. Network the miner and find its IP

    Connect Ethernet — Wi-Fi is not supported. Power on, wait about 60 seconds, then locate the machine using the manufacturer's IP reporter tool or your router's DHCP client list. Open that IP in a browser and sign in to the web dashboard, then immediately change the default password.

  4. 4. Configure your wallet and mining pool

    Create a receiving address for the coin you intend to mine, add it to your pool account payout settings, then enter the pool stratum URL, worker name and password in the miner's Pools tab. Configure two backup pools for automatic failover.

  5. 5. Verify hashrate and stabilise

    Save the configuration and let the machine warm up for 15–20 minutes. Confirm the dashboard shows the rated 235 TH/s with zero hardware errors, and check the same worker appears live on your pool page. Watch board temperatures and fan speeds for the first hour.

  6. 6. Monitor, maintain and get support

    Set pool alerts for offline workers, review payouts after the first 24 hours, and schedule maintenance — quarterly dust cleaning and fan inspection. Bitcoin Mining Depot provides free remote setup assistance and 24/7 technical support for every unit we ship.

Used Bitmain Antminer S21+ 235 TH/s – 7 Months Runtime — frequently asked questions

Buy the Used Bitmain Antminer S21+ 235 TH/s – 7 Months Runtime in your city

The Used Bitmain Antminer S21+ 235 TH/s – 7 Months Runtime ships from our Causeway Bay, Hong Kong warehouse to buyers across North America, Europe, the UK and Australia. Pick your city below for local pricing, delivery timelines, power requirements and hosting options, or contact our desk for a door-to-door quote to any address worldwide.

Bitmain miners in United States

Express air freight from Hong Kong into Los Angeles, Chicago or Memphis, then courier to your city, typically 3–7 business days with duty itemised before payment.

Bitmain miners in Canada

Cleared through Vancouver or Toronto and delivered to your address or hosting facility, usually 4–8 business days with GST/HST calculated up front.

Bitmain miners in United Kingdom

Air freight into Heathrow or East Midlands with UK VAT and EORI paperwork prepared, then next-day domestic delivery.

Bitmain miners in Germany

Frankfurt clearance with EU import VAT and EORI documentation prepared in advance, then road delivery across Germany.

Bitmain miners in Netherlands

Schiphol air freight or Rotterdam consolidation, with EU VAT paperwork ready so clearance is never the bottleneck.

Bitmain miners in Australia

Air freight into Sydney, Melbourne or Perth with GST and quarantine documents handled by our freight desk.

Bitmain miners in Austria

EU clearance via Frankfurt or Vienna with import VAT paperwork prepared, then road delivery to your site.

Bitmain miners in Belgium

Brussels or Liège air freight with EU VAT and EORI documents supplied, then same-week road delivery.

Keep researching the Used Bitmain Antminer S21+ 235 TH/s – 7 Months Runtime

Compare this machine against other Bitmain models, browse the category hubs it belongs to, and read the operator guides that cover its hashrate, efficiency and payback math.

More Bitmain miners

Alternatives to consider

Guides & category hubs

Related hardware