Bitmain Antminer S21 Hyd (335Th)
Hydro-Cooled Miner
This miner uses a closed-loop liquid cooling system (hydro cooling) instead of traditional air cooling. Water or coolant circulates through internal channels to absorb heat from the ASIC chips, then transfers it to an external radiator or facility cooling loop.
Hydro-cooled miners run significantly quieter than air-cooled models since they eliminate or minimize fan noise. They also achieve higher hashrates and better efficiency because the chips can be driven harder while staying within safe thermal limits. The trade-off: hydro miners require compatible water infrastructure — inlet/outlet connections, a cooling distribution unit (CDU), and proper plumbing.
Hydro cooling is ideal for professional mining operations and data centers where water infrastructure already exists, or for home miners building a dedicated water-cooled setup to eliminate noise completely.
Professional-Grade Miner
This miner draws 5,360W and produces 75+ dB of noise — it is designed for dedicated mining environments, not living spaces. Professional-grade miners deliver the highest hashrate and revenue per unit but require proper infrastructure: a 240V circuit, adequate ventilation or exhaust ducting, and a space where noise is not a concern (garage, basement, warehouse, or outdoor enclosure).
For home miners looking for a quieter alternative, consider our Bitcoin Space Heater builds or explore open-source miners like the Bitaxe that are purpose-built for residential environments.
Profitability Calculator
| Period | Revenue | Electricity Cost | Profit |
|---|---|---|---|
| Daily | $9.45 | $9.00 | $0.44 |
| Weekly | $66.12 | $63.03 | $3.09 |
| Monthly | $283.37 | $270.14 | $13.22 |
| Yearly | $3,447.64 | $3,286.75 | $160.89 |
Heating offset estimates the value of heat replacing an electric space heater during heating season (~6 months/year in Canada). Actual savings depend on your heating setup and climate.
Where to Buy the Bitmain Antminer S21 Hyd (335Th)
D-Central Technologies
CanadaBitcoin Mining Hackers since 2016. Ships from Laval, Quebec.
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United StatesWide selection of new and used ASIC miners. US-based shipping.
Shop NowFull Specifications
| Model | Bitmain Antminer S21 Hyd (335Th) |
| Model Number | Antminer S21 Hyd (335Th) |
| Manufacturer | Bitmain |
| Algorithm | SHA-256 |
| Coins Mined | Bitcoin (BTC) |
| Hashrate | 335 TH/s |
| Power Consumption | 5,360 W |
| Efficiency | 16 J/TH |
| Dimensions | 410 x 170 x 209mm |
| Weight | 14.2 |
| BTU Output | 18288 BTU/hr |
| Equivalent Heater | Equal to a 5,360W space heater |
| Daily Power Cost | $9.00/day |
| Monthly Power Cost | $270.14/mo |
| Circuit Requirement | 240V circuit required |
| Release Date | 2024-03-01 |
| MSRP | $3,999.00 |
| Status | Active |
Custom Power Profiles
With custom firmware like DCENT_OS, this miner can be tuned across a wide range of power levels. Lower wattage improves efficiency and reduces electricity costs; higher wattage increases hashrate at the expense of efficiency.
| Wattage | Hashrate | Efficiency |
|---|---|---|
| 1,630 W | 92 TH/s | 17.7 J/TH |
| 2,280 W | 127 TH/s | 18 J/TH |
| 2,930 W | 163 TH/s | 18 J/TH |
| 3,580 W | 199 TH/s | 18 J/TH |
| 4,210 W | 235 TH/s | 17.9 J/TH |
| 4,860 W | 271 TH/s | 17.9 J/TH |
| 5,500 W | 307 TH/s | 17.9 J/TH |
| 6,150 W | 342 TH/s | 18 J/TH |
| 6,480 W | 360 TH/s | 18 J/TH |
Actual performance varies by individual unit silicon quality, ambient temperature, and cooling configuration. These operating points are achievable with custom tuning firmware such as DCENT_OS; values are calculated at runtime by the autotuner, not fixed presets.
Home Mining Assessment
The Bitmain Antminer S21 Hyd (335Th) is a SHA-256 cryptocurrency miner manufactured by Bitmain. It delivers a hashrate of 335 TH/s with a power consumption of 5360W, achieving an efficiency of 16 J/TH.
Weighs 14.2 kg, measures 410 x 170 x 209mm.
With a home mining score of 16/100, this miner is best suited for dedicated mining spaces for residential use. It produces 18288 BTU/h of heat output, making it effective for supplemental space heating.
At 16 J/TH, the Bitmain Antminer S21 Hyd (335Th) sits in the current-generation efficiency tier, competitive with modern SHA-256 hardware (roughly 13-19 J/TH).
Its waste heat (around 18288 BTU/h) can be ducted into a room, turning money you would otherwise spend on heating into hashrate.
View detailed specifications, real-time profitability calculations, and comparison data for the Bitmain Antminer S21 Hyd (335Th) in our comprehensive ASIC miner database.
Antminer S21 specs, repair, and parts
Use the S21 cluster to connect current-generation specs, buying options, chip-level parts, troubleshooting, and repair support.
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Compare the Bitmain Antminer S21 Hyd (335Th)
Frequently Asked Questions
What are the current mining economics for the Bitmain Antminer S21 Hyd (335Th)?
At $0.07/kWh electricity, the Bitmain Antminer S21 Hyd (335Th) currently shows an estimated $0.44 daily net result before pool fees and hardware cost. Results depend on your electricity rate and Bitcoin network conditions. Use the calculator above with your actual electricity rate.
Can I mine Bitcoin at home with the Bitmain Antminer S21 Hyd (335Th)?
The Bitmain Antminer S21 Hyd (335Th) has a home mining score of 16/100. With 0 dB noise and 5,360W power draw, it may require a dedicated space like a garage, basement, or outdoor enclosure. Consider noise insulation and proper ventilation.
Can the Bitmain Antminer S21 Hyd (335Th) heat my home?
The Bitmain Antminer S21 Hyd (335Th) outputs approximately 18288 BTU/hr of heat. For reference, a typical space heater produces 5,000-5,500 BTU/hr. All electrical energy consumed by the miner is converted to heat, making it 100% efficient as a heater. D-Central offers Bitcoin Space Heater builds designed specifically for home heating integration.
What power supply does the Bitmain Antminer S21 Hyd (335Th) need?
The Bitmain Antminer S21 Hyd (335Th) draws 5,360W of power. You need a power supply rated for at least 5,896W with appropriate voltage (200-240V AC). D-Central stocks compatible power supplies in our shop. Always use a quality PSU from a reputable manufacturer to protect the miner and wiring.