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