About Antminer S21 Pro

Bitcoin (BTC) is secured by the SHA-256 proof-of-work algorithm, and an Antminer S21 Pro is hardware purpose-built to solve SHA-256 work as fast and efficiently as possible. The faster it computes, measured in TH/s, the larger your share of block rewards.

The right Antminer S21 Pro balances raw output with power efficiency and reliability. We only list machines that earn their keep, and our specialists will help you match a model to your budget, your electricity rate and your available space before you commit a single dollar.

Finally, remember that hardware is only half the equation. The best Antminer S21 Pro in the world still needs stable power, a decent internet connection and a sane place to run. We cover the hardware side completely, and our team is glad to advise on the rest so your first day of mining goes smoothly.

Antminer S21 Pro in stock

In stock and ready to ship. Brand-new, factory-sealed and bench-tested.

Antminer S21 Pro: models compared

Here is how the most popular options stack up. Each links to its full spec sheet and live price so you can compare at a glance.

• Bitmain Antminer S21 Pro Bitcoin Miner — in stock at MiningGear Co, brand-new and bench-tested before it ships.
• Bitmain Antminer S21 Pro 245TH BTC Bitcoin Miner — in stock at MiningGear Co, brand-new and bench-tested before it ships.
• Bitmain AMLOGIC A113D Control board for Antminer S19, S21 & S21 Pro/XP/+ — in stock at MiningGear Co, brand-new and bench-tested before it ships.
• Antminer S21 Pro (234–245 TH/s) — in stock at MiningGear Co, brand-new and bench-tested before it ships.
• Antminer APW11 1721 Replacement Power Supply for (S21 Hyd.,S21+ Hyd.,S19 Pro+ Hyd.,S19 XP Hyd.,S19e XP Hyd.,S21 XP Hyd.,) — in stock at MiningGear Co, brand-new and bench-tested before it ships.

Mining other coins too? Compare our 100th S, Bitaxe Miner, Avalon Q hardware and build a diversified farm from one trusted supplier.

Deciding between these models comes down to your budget and your power situation. If you want maximum output and have cheap electricity, lean toward the higher-hashrate units at the top of the list. If you are mining at home or watching your upfront spend, a mid-range Antminer S21 Pro often delivers the best balance of price, efficiency and noise. Still unsure? Send us your electricity rate and we will tell you exactly which one pays back fastest.

Antminer s21 pro setup guide

Getting a new Antminer S21 Pro running takes minutes, not hours:

• Place it correctly. Install your Antminer S21 Pro in a cool, dust-free, well-ventilated space on a dedicated circuit rated for its draw.
• Connect and power on. Plug the included PSU into the hashboards and control board, then link the miner to your router by Ethernet.
• Find its IP and log in. Use your router or a network scanner to locate the unit, then open its built-in dashboard in a browser.
• Add your pool. Enter your Bitcoin (BTC) pool URL and your wallet address as the worker, then save. The miner starts submitting shares within minutes.
• Monitor and tune. Keep temperatures low and airflow clear so your Antminer S21 Pro holds its rated hashrate around the clock.

Common Antminer S21 Pro mistakes to avoid

A few avoidable errors trip up first-time buyers again and again. Paying for an untested second-hand Antminer S21 Pro to save a little money usually backfires. Buying on hashrate alone, without checking watts-per-unit, means overpaying for power forever. And setting the machine up in a small, warm, poorly ventilated room leads to throttling, noise complaints and shortened hardware life.

The fix is simple: choose a genuine, warranty-backed Antminer S21 Pro, compare efficiency rather than just speed, and plan your cooling and power before the unit arrives. Our team is happy to sanity-check your plan so you sidestep these pitfalls entirely and start earning Bitcoin (BTC) the right way.

How to choose the best Antminer S21 Pro

A home setup and a warehouse farm have very different needs. Use these four checks to pick the Antminer S21 Pro that fits your situation.

1. Hashrate

Hashrate, measured in TH/s, is how much work your Antminer S21 Pro does each second, and it maps directly to your share of block rewards. A higher number is appealing, but it only matters if the machine stays efficient at that speed. Always compare models like for like, and be wary of inflated headline figures a unit cannot sustain once it is warm and running around the clock.

2. Power efficiency

Efficiency is the single metric that decides whether you profit. Two machines with the same TH/s can post wildly different electricity bills. Divide the wattage by the hashrate for a clear cost-per-unit figure, then multiply your draw by your local power rate. A more efficient Antminer S21 Pro earns the same coins for a smaller monthly bill, and that gap only widens as difficulty climbs.

3. Noise and heat

Industrial ASICs are genuinely loud, often above 70 decibels, and they pump out real heat. If your Antminer S21 Pro will live in a spare room or garage rather than a data centre, prioritise quieter, lower-wattage units or budget for hydro and immersion cooling. Underestimating noise and heat is the most common regret among first-time home miners, so plan for it before the box arrives.

4. Total cost and resale

The sticker price is only part of the story. Factor in the included PSU, shipping, import duty (we cover it with DDP) and the unit’s likely resale value down the line. Proven brands such as Bitmain, MicroBT and Goldshell hold their value best on the second-hand market, which cushions your investment if you ever upgrade or rotate your hardware.

Power supply and electricity for your Antminer S21 Pro

Every Antminer S21 Pro ships with a compatible PSU from us, but your electricity setup still matters. Run the machine on a dedicated, correctly rated circuit, and remember that your power rate is the single biggest ongoing cost of mining Bitcoin (BTC). Lower-cost power dramatically improves profitability and shortens your payback period.

If you are scaling up, plan your electrical capacity before the hardware arrives. We are happy to advise on power requirements so your Antminer S21 Pro runs safely at full output from day one, with no tripped breakers or under-rated wiring to slow you down.

Browse more Antminer S21 Pro

In stock and ready to ship. Brand-new, factory-sealed and bench-tested.