Bitmain · Apr 2024
Antminer S21 Hydro
- Hashrate
- 335.00 Th/s
- Power
- 5.36 kW
- Efficiency
- 16.00 W/Th
- Benchmark
- $0.11/kWh
The entry point to liquid cooling. 335 Th/s, 5.36 kW, plentiful supply.
Top payouts / 24h
- QUAI$13.95
- PPC$12.18
- BTC$11.35
CatalogueSHA-256$13.95/day SHA-256$15.24/day SHA-256$16.24/day
SHA-256Hydro cooledReleased Feb 2025#18 by 24h profit
Bitmain
Antminer S21+ Hydro
The lightest draw in the catalogue at 4.79 kW — useful where breakers are tight.
Hashrate
319.00 Th/s
Power draw
4.79 kW
Efficiency
15.00 W/Th
Profit / 24h
$13.29
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
At 4,785 W the S21+ Hydro slips under the 5 kW circuit threshold that governs a lot of retrofitted industrial space. That single fact is why it keeps selling: operators can add a row without touching the switchgear. 15.00 W/Th is mid-pack, and the machine is priced accordingly.
- Under 5 kW — fits constrained breaker budgets
- 319 Th/s at 15.00 W/Th
- Common in retrofitted warehouse deployments
Full specification
- Manufacturer
- Bitmain
- Model
- Antminer S21+ Hydro
- Release
- Feb 2025
- Algorithm
- SHA-256
- Cooling
- Hydro — direct liquid loop
- Nameplate hashrate
- 319.00 Th/s
- Power at the wall
- 4785 W
- Efficiency
- 15.00 W/Th
- Benchmark power price
- $0.12/kWh
- Electricity cost / 24h at benchmark
- $13.78
- Gross revenue / 24h
- $13.29
- Profit / 24h
- $13.29
- Data source
- August 2026 dataset
Run the numbers
Break-even power price: $0.116/kWh
Gross / day
$13.02
Power / day
−$13.51
Net / day
$-0.48
- Net per month
- $-14.64
- Net per year
- $-175.56
- Margin on revenue
- -3.7%
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$13.29
- PPCSHA-256$11.63
- BTCSHA-256$10.81
Top coins — profit
- QUAISHA-256$13.29
- PPCSHA-256$11.63
- BTCSHA-256$10.81
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