Energy efficiency
13.5 J/TH
3,645 W ÷ 270 TH/s
#20 of 99 in the catalog
ASIC miner · Bitmain Sold by manufacturer: yes
Bitmain Antminer S21 XP
An air-cooled Bitcoin ASIC with 270 TH/s at 3,645 W — 13.5 J/TH, among the most efficient air-cooled models in the catalog.
About Antminer S21 XP
The Antminer S21 XP is Bitmain's air-cooled model, released in June 2024. At 13.5 J/TH it ranks #20 of 99 in the catalog by efficiency, and 6th 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.
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
87.5 kWh
3.65 kW × 24 h
31.9 MWh a year
Electricity cost per day
$8.75
87.5 kWh × $0.10 per kWh
Break-even electricity price
$0.093 / kWh
Estimated daily reward ÷ electricity used per day
As of 13 Nov 2026
Built for
Data center
76 dB, 3.65 kW of heat
Home class: up to 50 dB and 1.4 kW, air cooling
Hashrate per kW
74.1 TH/s
270 TH/s ÷ 3.65 kW
Antminer S21 XP or a digital miner with the same 270 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 XP
Your own machine · 270 TH/s · 13.5 J/TH
- Upfront cost
- Not shownNot in the catalog yet — see the manufacturer's store
- Reward per day (est.)
- 0.00011 BTC≈ $8.13 at the same hashrate
- Running cost per day
- $8.753.65 kW × 24 h × $0.10 per kWh
- Net per day (est.)
- −$0.62At your electricity price
- Delivery and setup
- Shipping, customs, pool setup
- Noise and heat
- 76 dB and 3.65 kW of heat at your place
GoMining digital miner
270 TH/s · 15 J/TH · runs in our data centers
- Upfront cost
- $3,081270 TH × $11.41 per TH
- Reward per day (est.)
- 0.00011 BTC≈ $8.13
- Running cost per day
- $7.26Daily maintenance fee: electricity and service
- Net per day (est.)
- $0.87After 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: $0.093 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 XP 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 XP
- Algorithm
- SHA-256 (Bitcoin)
- Energy efficiency
- 13.5 J/TH
- Calculated
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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