How efficient is the Antminer S21 Hydro?

The Antminer S21 Hydro runs at 16 J/TH — joules per terahash is the number that decides mining profitability. Water-cooled density for facilities, not garages.

How much power does the Antminer S21 Hydro use?

Typical wall draw is 5,360 W, which at a reference $0.10/kWh costs about $12.86 per day in electricity. Scale linearly to your own rate — the electricity price is the whole business.

Is the Antminer S21 Hydro suitable for home mining?

No — it is hydro-cooled and assumes facility infrastructure (liquid loops, dry coolers).

Bitmain · 2024

Antminer S21 Hydro

Water-cooled density for facilities, not garages.

Hashrate335 TH/s

Efficiency16 J/TH

Wall power5,360 W

Coolinghydro

Noisen/a (liquid)

Released2024

Energy $/day @ $0.10/kWh$12.86

The longer story

The S21 Hydro trades plug-and-play for density: water cooling lets it pack more hashrate per unit and run quieter, but it presupposes a facility with hydro loops, dry coolers and the plumbing expertise to run them. This is infrastructure, not an appliance.

It suits industrial deployments already built (or building) for liquid cooling — where the density and heat-reuse economics genuinely change the math. For anyone without that infrastructure, the air-cooled S21s deliver the same silicon without the plumbing.

Manufacturer site

Quick answers

How efficient is the Antminer S21 Hydro?: The Antminer S21 Hydro runs at 16 J/TH — joules per terahash is the number that decides mining profitability. Water-cooled density for facilities, not garages.
How much power does the Antminer S21 Hydro use?: Typical wall draw is 5,360 W, which at a reference $0.10/kWh costs about $12.86 per day in electricity. Scale linearly to your own rate — the electricity price is the whole business.
Is the Antminer S21 Hydro suitable for home mining?: No — it is hydro-cooled and assumes facility infrastructure (liquid loops, dry coolers).

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