Antminer S21+ – 225 TH/s

Product Description

The Antminer S21+ is an air-cooled SHA-256 ASIC miner from Bitmain for Bitcoin (BTC). This 225 TH/s version is listed at 3,712 W, an efficiency of 16.50 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: 3,712 W, about 15.5 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 76 dB, so plan a space away from living areas.
• Algorithm: SHA-256. Read what hashprice means for SHA-256 miners.
• Released: June, 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

Frequently asked questions

How much power does the Antminer S21+ use?

This 225 TH/s version is rated at 3,712 W, about 15.5 A at 240 V. Size the circuit for a continuous load of that size.

Can I plug the Antminer S21+ 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 3,712 W load.

How loud is the Antminer S21+?

It is listed at 76 dB. At that level, plan a garage, basement or dedicated room rather than a living area.

What coins can the Antminer S21+ 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+ 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.