Bitmain Antminer S21 Hydro Bitcoin Miner

Bitmain Antminer S21 Hydro Bitcoin MinerThe Bitmain Antminer S21 Hydro 395TH/s Bitcoin Miner is a professional-grade SHA-256 ASIC miner engineered for high-efficiency Bitcoin mining operations requiring serious computational power, optimized thermal control, and quieter large-scale deployment.Delivering up to 395TH/s hashrate at 5925W power consumption, the Antminer S21 Hydro combines powerful Bitcoin mining output with impressive 15 J/TH energy efficiency, helping miners maximize operational performance while reducing unnecessary energy waste.Unlike traditional air-cooled ASIC miners that flood mining facilities with excessive fan noise and heat buildup, the S21 Hydro utilizes an advanced liquid cooling system to maintain stable operating temperatures while significantly lowering acoustic output.Which, in mining terms, is practically suspiciously civilized behavior.Key BenefitsPowerful 395TH/s SHA-256 Bitcoin mining performanceExcellent 15 J/TH energy efficiencyAdvanced hydro cooling for improved thermal stabilityDesigned for professional 24/7 mining environmentsOptimized for Bitcoin (BTC) and SHA-256 miningImproved cooling consistency compared to air-cooled ASICsEthernet connectivity for reliable deploymentWhy Choose the Antminer S21 Hydro?As mining difficulty continues increasing, efficiency and cooling performance matter just as much as raw hashrate. The Antminer S21 Hydro is built specifically for mining operators seeking high-output Bitcoin mining hardware that remains thermally stable under sustained workloads.Hydro cooling allows for more efficient heat transfer compared to traditional fan-based cooling systems, helping reduce thermal stress while improving long-term operational consistency. The reduced noise profile also makes the S21 Hydro more manageable inside modern mining environments where airflow and acoustic control matter.For professional miners balancing performance, efficiency, and facility optimization, the Antminer S21 Hydro delivers an exceptionally refined mining solution.Perfect ForCommercial Bitcoin mining farmsHydro-cooled mining systemsProfessional SHA-256 mining operationsHigh-efficiency BTC miningLarge-scale mining infrastructureLower-noise industrial mining deploymentsHydro Cooling AdvantagesThe Antminer S21 Hydro uses liquid cooling technology to eliminate excessive heat buildup commonly associated with high-performance ASIC miners. By transferring heat more efficiently than traditional air cooling systems, hydro cooling helps maintain consistent mining performance while reducing hardware strain and environmental heat concentration.The result is better thermal management, quieter operation, and improved deployment efficiency for serious Bitcoin mining facilities.Engineered for Professional Mining OperationsThe Antminer S21 Hydro is designed for miners operating dedicated hydro-cooling infrastructure and industrial-grade power systems. Its combination of high hashrate, strong energy efficiency, and quieter operation makes it an ideal choice for modern mining farms focused on scalable and stable Bitcoin mining performance.If your operation demands efficient SHA-256 mining hardware built for sustained performance, the S21 Hydro belongs in the conversation.Key Features & SpecsFeatureDetailsManufacturerBitmainModelAntminer S21 HydroAlgorithmSHA-256Hashrate395TH/sPower Consumption5925WEfficiency15 J/THCoolingHydro CoolingNet Weight13.8kgVoltage380–415VInterfaceEthernetCoolant Flow8.0–10.0 L/minCoolant Pressure≤3.5 barWorking CoolantAntifreeze / Pure Water / DI WaterOperating Temp20°C – 50°CStorage Temp-20°C – 70°CHumidity10–90% RHSize (No Package)339 × 173 × 207mmSize (With Package)570 × 316 × 430mm  Product AttributesAttribute BrandBitmainModelS21 HydroMiner TypeHydro ASIC MinerAlgorithmSHA-256CoinsBitcoin (BTC)Cooling TypeHydro CoolingConnectivityEthernetVoltage380–415V  Antminer S21 Hydro profitability calculator Frequently Asked Questions Is a power cord included with the miner TBD I'm not getting the advertised efficiency on stock settings. Is there something wrong with my miner? Mining efficiency is highly dependent on ambient air temperature. If your miner is pulling more power than expected, in most cases it is due to a higher ambient temperature. You can improve mining efficiency by preventing mixing of hot exhaust air with intake air.  Can you ship this directly to my hosting company? Yes, you can either take delivery yourself or ship this to your hosting company by providing their address under the shipping address field on checkout page.  Can you recommend a reputable hosting company? While we do not have our own hosting facility, as a Bitcoin mining hardware vendor, we regularly ship ASIC miners and repair parts to various hosting sites across the US. Here’s a list of some of the companies we’ve worked with:–BSLF Mining–Terra Hosting–Wilson Mining This list is a recommendation and not an endorsement for these hosting companies. Please do your own due diligence, before choosing a colocation host. You can do further research on hosting companies on hashbranch.com Who should I contact if there's a problem with my miner? New Antminers come with ~1 year warranty from Bitmain. Please reach out to Bitmain and apply for repair directly with them.  Does this product have a factory warranty? The product is sold new, unopened with a factory warranty unless otherwise requested by the customer to upgrade to aftermarket firmware. Generally, the manufacturer provides a one-year warranty from the manufactured date. The manufacturer warranty period and limitations can be referenced by going directly to their website. For further information and links please view our blog post on warranty. Is this product covered by Altair Technology’s 14 day Warranty Against Defects? This item is excluded from the Altair Technology’s 14 day warranty. However, the manufacturer does provide a warranty. For more information we recommend referencing the manufacturers most updated policy directly from their website.  What coins can the Antminer S21 Hydro mine? The S21e Hydro mines SHA-256 cryptocurrencies including Bitcoin (BTC) and Bitcoin Cash (BCH). How much power does the Antminer S21 Hydro use? The miner consumes approximately 5270W during standard operation. What voltage does the Antminer S21 Hydro require? The miner operates on 380–415V power input.