Energy efficiency
16.0 J/TH
5,360 W ÷ 335 TH/s
#45 of 99 in the catalog
ASIC miner · Bitmain
Bitmain Antminer S21 Hyd
A hydro-cooled Bitcoin ASIC with 335 TH/s at 5,360 W — 16.0 J/TH.
About Antminer S21 Hyd
The Antminer S21 Hyd is Bitmain's hydro-cooled model, released in September 2023. At 16.0 J/TH it ranks #45 of 99 in the catalog by efficiency, and 22nd of 33 among hydro-cooled machines.
With a water cooling loop and 5.4 kW it needs a hosting site or a data center. It comes in hashrate variants from 302 to 335 TH/s; this page uses the manufacturer's nominal 335 TH/s.
What the specs add up to
Derived from the specs below, with the formula on every card. Estimates, not a forecast
Electricity used per day
128.6 kWh
5.36 kW × 24 h
47.0 MWh a year
Electricity cost per day
$12.86
128.6 kWh × $0.10 per kWh
Break-even electricity price
$0.078 / kWh
Estimated daily reward ÷ electricity used per day
As of 13 Nov 2026
Built for
Data center
5.36 kW of heat
Home class: up to 50 dB and 1.4 kW, air cooling
Hashrate per kW
62.5 TH/s
335 TH/s ÷ 5.36 kW
Antminer S21 Hyd or a digital miner with the same 335 TH/s
Same hashrate, side by side. Scenario: you run the machine yourself, on household electricity. Numbers follow our reward calculator and update daily
BTC price · 13 Nov 2026$70,780
Antminer S21 Hyd
Your own machine · 335 TH/s · 16.0 J/TH
- Upfront cost
- Not shownNot in the catalog yet — see the manufacturer's store
- Reward per day (est.)
- 0.00014 BTC≈ $10.09 at the same hashrate
- Running cost per day
- $12.865.36 kW × 24 h × $0.10 per kWh
- Net per day (est.)
- −$2.77At your electricity price
- Delivery and setup
- Shipping, customs, pool setup
- Noise and heat
- 5.36 kW of heat at your place
GoMining digital miner
335 TH/s · 15 J/TH · runs in our data centers
- Upfront cost
- $3,802335 TH × $11.35 per TH
- Reward per day (est.)
- 0.00014 BTC≈ $10.09
- Running cost per day
- $9.01Daily maintenance fee: electricity and service
- Net per day (est.)
- $1.08After the maintenance fee
- Delivery and setup
- Nothing to ship — runs in the app
- Noise and heat
- Nothing at your place
Break-even electricity price for this model: $0.078 per kWh. Above it, electricity costs more than the estimated reward
Estimates, not a forecast. Based on the BTC price, network difficulty and GoMining fees as of 13 Nov 2026; specs as published by the manufacturer. Assumes the machine runs 24/7 with no pool fee; industrial hosting is a different calculation. The digital miner's fee is shown before discounts. Mining rewards vary and are not guaranteed; they may fall below fees. Not investment advice. See terms
Antminer S21 Hyd specifications
16 characteristics, each with its source and the date we checked it. Values are nominal, as published by the manufacturer
- Published spec
- Calculated by GoMining
- Not found
- Manufacturer
- Bitmain
- Model
- Antminer S21 Hyd
- Algorithm
- SHA-256 (Bitcoin)
- Energy efficiency
- 16.0 J/TH
- Calculated
- Sold by manufacturer
- —
- Not found · 16 Oct 2026
- Noise level
- —The manufacturer does not publish it
- Not found · 16 Oct 2026
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*The bonus miner is subject to vesting and requires a qualifying transaction. Rewards vary and are not guaranteed. See full terms
Frequently Asked Questions
Questions about this model. For everything else, head to the Help Center