Energy efficiency
16.5 J/TH
3,564 W ÷ 216 TH/s
#47 of 99 in the catalog
ASIC miner · Bitmain
Bitmain Antminer S21+
An air-cooled Bitcoin ASIC with 216 TH/s at 3,564 W — 16.5 J/TH.
About Antminer S21+
The Antminer S21+ is Bitmain's air-cooled model, released in October 2024. At 16.5 J/TH it ranks #47 of 99 in the catalog by efficiency, and 14th of 48 among air-cooled machines.
At 76 dB and 3.6 kW it needs a data center or a dedicated ventilated room, not a living room. It comes in hashrate variants from 216 to 235 TH/s; this page uses the manufacturer's nominal 216 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
85.5 kWh
3.56 kW × 24 h
31.2 MWh a year
Electricity cost per day
$8.55
85.5 kWh × $0.10 per kWh
Break-even electricity price
$0.076 / kWh
Estimated daily reward ÷ electricity used per day
As of 13 Nov 2026
Built for
Data center
76 dB, 3.56 kW of heat
Home class: up to 50 dB and 1.4 kW, air cooling
Hashrate per kW
60.6 TH/s
216 TH/s ÷ 3.56 kW
Antminer S21+ or a digital miner with the same 216 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+
Your own machine · 216 TH/s · 16.5 J/TH
- Upfront cost
- Not shownNot in the catalog yet — see the manufacturer's store
- Reward per day (est.)
- 0.00009 BTC≈ $6.51 at the same hashrate
- Running cost per day
- $8.553.56 kW × 24 h × $0.10 per kWh
- Net per day (est.)
- −$2.05At your electricity price
- Delivery and setup
- Shipping, customs, pool setup
- Noise and heat
- 76 dB and 3.56 kW of heat at your place
GoMining digital miner
216 TH/s · 15 J/TH · runs in our data centers
- Upfront cost
- $2,477216 TH × $11.47 per TH
- Reward per day (est.)
- 0.00009 BTC≈ $6.51
- Running cost per day
- $5.81Daily maintenance fee: electricity and service
- Net per day (est.)
- $0.70After 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: $0.076 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+ 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+
- Algorithm
- SHA-256 (Bitcoin)
- Energy efficiency
- 16.5 J/TH
- Calculated
- Sold by manufacturer
- —
- 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
常见问题解答
Questions about this model. For everything else, head to the Help Center