Antminer S21 Pro – 245 TH/s
$2,869.43 $2,008.60
- Hashrate: 245 TH/s
- Power draw: 3,675 W
- Efficiency: 15.0 J/TH
- Algorithm: SHA-256
- Cooling: Air-cooling
- Condition: New
- US shipping: $120 flat rate, dispatched in 5-10 business days after payment, 0-1 business days in transit
- 30-day limited warranty · 20-day returns
Product Description
The Antminer S21 Pro is an air-cooled SHA-256 ASIC miner from Bitmain for Bitcoin (BTC). This 245 TH/s version is listed at 3,675 W, an efficiency of 15 J/TH.
As an air-cooled machine it relies on its own fans, so it needs a steady supply of cool intake air and somewhere for the hot exhaust to go. Plan ventilation and noise before the unit arrives.
Before you order
- Power: 3,675 W, about 15.3 A at 240 V. Size the circuit for a continuous load and check the input voltage on the unit before you plug it in.
- Noise: listed at 75 dB, so plan a space away from living areas.
- Algorithm: SHA-256. Read what hashprice means for SHA-256 miners.
- Released: August 2025.
Compare other models in our Bitcoin Miners (SHA-256) range, or see how efficiency is measured in Hashrate, TH/s and J/TH explained.
Technical Specifications
| Vendor | Antminer |
| Brand | Bitmain |
| Model | S21 Pro |
| Hash Rate | 245 TH/s |
| Algorithm | SHA-256 |
| Supported Coins | Bitcoin (BTC) |
| Power Consumption | 3675 W |
| Energy Efficiency | 15 J/TH |
| Cooling System | Air-cooling |
| Dimensions | 450x220x300 mm |
| Noise Level | 75 dB |
| Operating Temperature | 5°C to 45°C |
| Network Interface | Ethernet |
| Release Date | August 2025 |
Frequently asked questions
How much power does the Antminer S21 Pro use?
This 245 TH/s version is rated at 3,675 W, about 15.3 A at 240 V. Size the circuit for a continuous load of that size.
Can I plug the Antminer S21 Pro into a standard US outlet?
No. It needs 220-277 V AC single-phase input, so a standard 120 V outlet will not run it. Have an electrician install a 240 V circuit rated for a continuous 3,675 W load.
How loud is the Antminer S21 Pro?
It is listed at 75 dB. At that level, plan a garage, basement or dedicated room rather than a living area.
What coins can the Antminer S21 Pro mine?
It mines SHA-256, so it can mine Bitcoin (BTC) and other SHA-256 coins such as Bitcoin Cash (BCH). It works with any SHA-256 pool; see mining pools explained.
Does the Antminer S21 Pro come with a warranty?
Yes. This listing is for a new unit with a 30-day limited warranty from Bitminers, starting on the date of delivery. A manufacturer warranty may also apply. See our Warranty Policy.
Shipping, Payment, Warranty & Returns
- Shipping: United States only. Flat rate of $120 per order. Orders are dispatched within 5-10 business days after payment is received, and transit within the US takes 0-1 business days after dispatch. See our Shipping Policy.
- Payment: bank transfer. Our bank details are provided after you place your order. See our Payment Policy.
- Warranty: 30-day limited warranty from Bitminers, starting on the date of delivery. A manufacturer warranty may also apply. See our Warranty Policy.
- Returns: eligible items can be returned within 20 calendar days of delivery. See our Return & Refund Policy.
Related guides: Antminer S21 series explained · Antminer models explained · Hashrate, TH/s and J/TH explained
Mining results depend on electricity costs, network difficulty and cryptocurrency prices. Bitminers does not guarantee mining profitability or return on investment.
Additional Information
| Condition | New |
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