Bitmain · Feb 2025
Antminer S21+ Hydro
- Hashrate
- 319.00 Th/s
- Power
- 4.79 kW
- Efficiency
- 15.00 W/Th
- Benchmark
- $0.12/kWh
The lightest draw in the catalogue at 4.79 kW — useful where breakers are tight.
Top payouts / 24h
- QUAI$13.29
- PPC$11.63
- BTC$10.81
CatalogueSHA-256$13.29/day SHA-256$15.24/day SHA-256$16.24/day
SHA-256Hydro cooledReleased Apr 2024#17 by 24h profit
Bitmain
Antminer S21 Hydro
The entry point to liquid cooling. 335 Th/s, 5.36 kW, plentiful supply.
Hashrate
335.00 Th/s
Power draw
5.36 kW
Efficiency
16.00 W/Th
Profit / 24h
$13.95
Priced per unit on request — pricing moves with batch, condition and freight destination.
Technical faceplate drawing generated from this unit's own specs — board count, port layout and vent density track the real configuration. Photography available on request.
The short version
If you are moving a room from air to liquid for the first time, this is the machine to learn on. It is forgiving, cheap to replace, and the loop hardware carries straight over to the XP and XP+ units you will eventually upgrade to.
- Lowest-risk introduction to hydro deployment
- Loop hardware carries over to S21 XP / XP+
- 16.00 W/Th at 335 Th/s
Full specification
- Manufacturer
- Bitmain
- Model
- Antminer S21 Hydro
- Release
- Apr 2024
- Algorithm
- SHA-256
- Cooling
- Hydro — direct liquid loop
- Nameplate hashrate
- 335.00 Th/s
- Power at the wall
- 5360 W
- Efficiency
- 16.00 W/Th
- Benchmark power price
- $0.11/kWh
- Electricity cost / 24h at benchmark
- $14.15
- Gross revenue / 24h
- $13.95
- Profit / 24h
- $13.95
- Data source
- August 2026 dataset
Run the numbers
Break-even power price: $0.108/kWh
Gross / day
$13.67
Power / day
−$13.87
Net / day
$-0.20
- Net per month
- $-5.98
- Net per year
- $-71.68
- Margin on revenue
- -1.4%
Gross revenue is the catalogue figure for this unit. Net subtracts electricity at your rate only — pool fees, hosting and hardware amortisation are not included, and payouts move with network difficulty.
Where the money comes from
Best-paying SHA-256 targets over the last 24 hours.
Top coins — revenue
- QUAISHA-256$13.95
- PPCSHA-256$12.18
- BTCSHA-256$11.35
Top coins — profit
- QUAISHA-256$13.95
- PPCSHA-256$12.18
- BTCSHA-256$11.35
Switching targets is a firmware and pool-config change, not a hardware change. Most operators point at the top line and let a profit switcher handle the rest.
What a quote includes
- Unit price at your order quantity
- Lead time and current batch availability
- Freight to your site, duties flagged separately
- Warranty terms — new, refurbished or as-is
- Payback estimate against your real power price
Comparable SHA-256 units
MicroBT · Oct 2023
Whatsminer M63 Hydro
- Hashrate
- 366.00 Th/s
- Power
- 7.30 kW
- Efficiency
- 19.95 W/Th
- Benchmark
- $0.09/kWh
The base M63. The cheapest way into MicroBT hydro, if the power maths works.
Top payouts / 24h
- QUAI$15.24
- PPC$13.26
- BTC$12.40
MicroBT · Oct 2023
Whatsminer M63S Hydro
- Hashrate
- 390.00 Th/s
- Power
- 7.25 kW
- Efficiency
- 18.59 W/Th
- Benchmark
- $0.09/kWh
MicroBT’s durable M63S. Not the most efficient, close to the most reliable.
Top payouts / 24h
- QUAI$16.24
- PPC$14.09
- BTC$13.22