How efficient is the Antminer S21?

The Antminer S21 runs at 17.5 J/TH — joules per terahash is the number that decides mining profitability. First of the S21 line — now the value pick of the family.

How much power does the Antminer S21 use?

Typical wall draw is 3,500 W, which at a reference $0.10/kWh costs about $8.40 per day in electricity. Scale linearly to your own rate — the electricity price is the whole business.

Is the Antminer S21 suitable for home mining?

Only with acoustic isolation: at ~75 dB it is data-center loud. Home miners use soundboxes, sheds, or pick a quiet unit like the Avalon Mini 3 or Bitaxe.

Bitmain · 2023

Antminer S21

First of the S21 line — now the value pick of the family.

Hashrate200 TH/s

Efficiency17.5 J/TH

Wall power3,500 W

Coolingair

Noise~75 dB

Released2023

Energy $/day @ $0.10/kWh$8.40

The longer story

The original S21 launched the generation and now plays the value position: efficiency that was flagship-grade at release, at street prices the newer variants pushed down. For buyers running the classic “efficiency per dollar of hardware” math, it frequently wins.

It suits cost-conscious operations and serious home miners with cheap power. The trade-off is simply that its XP and Pro siblings do the same work on less energy — whether that matters depends entirely on your electricity price and time horizon.

Manufacturer site

Quick answers

How efficient is the Antminer S21?: The Antminer S21 runs at 17.5 J/TH — joules per terahash is the number that decides mining profitability. First of the S21 line — now the value pick of the family.
How much power does the Antminer S21 use?: Typical wall draw is 3,500 W, which at a reference $0.10/kWh costs about $8.40 per day in electricity. Scale linearly to your own rate — the electricity price is the whole business.
Is the Antminer S21 suitable for home mining?: Only with acoustic isolation: at ~75 dB it is data-center loud. Home miners use soundboxes, sheds, or pick a quiet unit like the Avalon Mini 3 or Bitaxe.

Compare & alternatives

antminer-s21 vs whatsminer-m60s antminer-s19j-pro vs antminer-s21 antminer-s21 vs avalon-a1566 Antminer S21 XP Antminer S21 Pro Antminer S19j Pro Whatsminer M60S

All hardware, efficiency-first → · Pick a pool → · Electricity prices by country →