Energy efficiency
15.0 J/TH
3,510 W ÷ 234 TH/s
#38 of 99 in the catalog
ASIC miner · Bitmain
Bitmain Antminer S21 Pro
An air-cooled Bitcoin ASIC with 234 TH/s at 3,510 W — 15.0 J/TH, among the most efficient air-cooled models in the catalog.
About Antminer S21 Pro
The Antminer S21 Pro is Bitmain's air-cooled model, released in March 2024. At 15.0 J/TH it ranks #38 of 99 in the catalog by efficiency, and 12th of 48 among air-cooled machines.
At 76 dB and 3.5 kW it needs a data center or a dedicated ventilated room, not a living room. It comes in hashrate variants from 220 to 245 TH/s; this page uses the manufacturer's nominal 234 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
84.2 kWh
3.51 kW × 24 h
30.7 MWh a year
Electricity cost per day
$8.42
84.2 kWh × $0.10 per kWh
Break-even electricity price
$0.084 / kWh
Estimated daily reward ÷ electricity used per day
As of 13 Nov 2026
Built for
Data center
76 dB, 3.51 kW of heat
Home class: up to 50 dB and 1.4 kW, air cooling
Hashrate per kW
66.7 TH/s
234 TH/s ÷ 3.51 kW
Antminer S21 Pro or a digital miner with the same 234 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 Pro
Your own machine · 234 TH/s · 15.0 J/TH
- Upfront cost
- Not shownNot in the catalog yet — see the manufacturer's store
- Reward per day (est.)
- 0.00010 BTC≈ $7.05 at the same hashrate
- Running cost per day
- $8.423.51 kW × 24 h × $0.10 per kWh
- Net per day (est.)
- −$1.38At your electricity price
- Delivery and setup
- Shipping, customs, pool setup
- Noise and heat
- 76 dB and 3.51 kW of heat at your place
GoMining digital miner
234 TH/s · 15 J/TH · runs in our data centers
- Upfront cost
- $2,670234 TH × $11.41 per TH
- Reward per day (est.)
- 0.00010 BTC≈ $7.05
- Running cost per day
- $6.29Daily maintenance fee: electricity and service
- Net per day (est.)
- $0.75After 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: $0.084 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 Pro 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 Pro
- Algorithm
- SHA-256 (Bitcoin)
- Energy efficiency
- 15.0 J/TH
- Calculated
- Sold by manufacturer
- —
- Not found · 16 Oct 2026
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