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Power
5104W
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Hashrate
335.00 TH/s
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Efficiency
15.24 J/T
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Algorithm
SHA-256
Bitmain Antminer S21 Hyd Bitcoin Miner 335TH/s | BT-MINERS
US$5,999.00
Supports 24/7 continuous operation
Warranty : Come with 6-month factory warranty.
S21 Hyd Profitability Calculate
Daily Earning
ROI
Electricity
Electricity ratio
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Miner Profitability History
Description
Antminer S21 Hyd 335T Description
Model Antminer S21 Hyd (335Th) from Bitmain mining SHA-256 algorithm with a maximum hashrate of 335Th/s for a power consumption of 5104W.
*This unit requires higher voltage set ups than typical miners, which may cause it to be unoperational in most homes and mining facilities. Please consult with our sales rep before placing order*
For Brand NEW Miner, Bitmain Provides 365 days of factory warranty.
Firmware
Antminer-S21-Hyd.-release-202405191051.bmuAntminer-S21-XP-Hyd.-release-202410111643.bmu
Technical Specifications
| Product Glance | Value |
|---|---|
| Model | S21 Hyd. |
| Crypto algorithm/coins | SHA256 | BTC/BCH/BSV |
| Typical hashrate | 335T |
| Power on wall @35℃, Watt | 5104 |
| Power efficiency on wall@35℃ | 16 |
| Detailed Characteristics | Value |
|---|---|
| Power Supply | |
| Phase | 3 |
| Input voltage, Volt | 380~415 |
| Input frequency range, Hz | 50~60 |
| Input max current, Amp | 12 |
| Hardware Configuration | |
| Networking connection mode | RJ45 Ethernet 10/100M |
| Server size(length*width*height, w/o package), mm | 339*173*207 |
| Server size(length*width*height, with package), mm | 570*316*430 |
| Net weight, kg | 12.3 |
| Gross weight, kg | 13.6 |
| Environment Requirements | Value |
|---|---|
| Inlet coolant temperature, °C | 20~50 |
| Coolant flow, L/min | 8.0~10.0 |
| Coolant pressure, bar | ≤3.5 |
| Working coolant | Antifreeze/ Pure water/Deionized water |
| Coolant pH value | Antifreeze:7.0~9.0 Pure water:6.5~7.5 Deionized wate:8.5~9.5 |
| Diameter of coolant pipe connector, mm | OD10 |
| Storage temperature, °C | -20~70 |
| Operation humidity(non-condensing), RH | 10~90% |
| Operation temperature,°C | -20~45 |
| Operation altitude, m | ≤2000 |
| What's in the Box | Value |
|---|---|
| Original factory mining machinery | ✓ |
| Power supply | ✓ |
| Shockproof packaging | ✓ |
Notes
(1) The hashrate value, power on wall, and power efficiency on wall are all typical values. The actual hashrate value fluctuates by ±3%, and the actual power on wall and power efficiency on wall fluctuate by ±5%.
(2) Caution: Wrong input voltage may cause server damaged.
(3) The noise is loudest when the fan is under maximum RPM(rotation per minute).
(4) When the server is used at an altitude from 900m to 2000m, the highest operating temperature decreases by 1℃ for every increase of 300m.
Estimate time
Please select your preferred product batch – Available Now (In Stock) for immediate shipment or Month Batch for delivery within your chosen timeframe. If no selection is needed, the product is in stock and ready to ship. If you haven’t received your miner after the estimated time, please contact us at store@bt-miners.com, and our team will assist you promptly.
Shipping
All used miners will undergo testing by our certified technicians before shipping, which requires 3-5 business days. New miners will be shipped from our Shenzhen or Hong Kong warehouse, with international delivery taking approximately 5-10 business days via DHL. Once your order is shipped, you will receive a confirmation email with a tracking number. Shipping fees are calculated based on product type and weight, varying by region.
Returning policy
All sales are final and non-refundable after shipment, but we offer repair and replacement services if there are technical issues with your miner.
It supports Ethernet connection. You just need to connect the power supply and network. You can download the batch group – control scanning software on the official website or through relevant channels to obtain the miner’s IP address. Then, enter the IP in the browser and log in to the miner management interface with the default initial username “root” and password “root” for configuration. If the device cannot be scanned, you can also log in to the background through the router’s IP address to configure it
Please visit this blog, where there are detailed introductions.
Antminer S21 Hyd Description
The Bitmain Antminer S21 Hyd is a purpose-built hydro-cooling BTC miner designed for industrial-scale operations. Unlike conventional air-cooled machines, the S21 Hyd circulates liquid through a sealed system, keeping thermal levels stable and extending overall hardware lifespan. This allows mining farms to run higher densities with fewer cooling challenges.
Delivering 335TH/s at approximately 5360W, the S21 Hyd reaches an energy efficiency of 16 J/TH, making it a dependable choice for long-term SHA-256 mining. Whether you operate a large hydro-cooled facility or are upgrading from an older S19 or S17 generation, this model offers a significant improvement in performance, thermal consistency, and uptime.
The miner is engineered for 380–415V three-phase electrical systems, which ensures steady power delivery under continuous load. It pairs best with a professionally installed hydro-cooling loop that maintains adequate flow rate, pressure stability, and clean coolant quality.
Bitmain’s Legacy and the Antminer Series
Bitmain has long been recognized as one of the most influential companies in the global cryptocurrency mining industry. Established in 2013, the company quickly became a pioneer in the development of high-performance ASIC mining hardware. Over the years, Bitmain’s engineering breakthroughs have shaped the evolution of blockchain mining, helping miners achieve higher profitability, lower energy consumption, and unprecedented operational efficiency.
At the core of Bitmain’s success is its legendary Antminer series—a lineup of ASIC miners covering major algorithms such as SHA-256, Equihash, Scrypt, Kadena, and more. Antminers are known worldwide for their stability, durability, and competitive edge in mining performance. The product line has produced some of the most iconic models in mining history, including the Antminer S9, S19 Pro, L7, Z15, and the latest next-generation units such as the S21 and Z15 Pro.
Each Antminer generation not only improves hashing efficiency but also introduces advanced chip architecture, enhanced cooling systems, and optimized firmware designed for 24/7 operation. The series has become the global standard for both home miners and industrial-scale mining farms, offering unmatched reliability and long-term performance.
Today, Bitmain continues to push the boundaries of ASIC technology, developing miners that deliver higher output with lower power consumption. The company’s commitment to quality and innovation has solidified the Antminer brand as the benchmark of professional cryptocurrency mining—trusted by millions of miners across the world.
Antminer S21 XP Hyd vs Antminer S21 Hyd
| Feature / Spec | Antminer S21 XP Hyd | Antminer S21 Hyd |
| Hashrate | 473 TH/s | 335 TH/s |
| Power Consumption | 5,676 W | 5,360 W |
| Power Efficiency | ≈12.0 J/TH | ≈16.0 J/TH |
| Cooling Method | Hydro (liquid-cooled) | Hydro (liquid-cooled) |
| Voltage Requirement | 380–415V AC (three-phase) | 380–415V AC (three-phase) |
| Best Use-Case | Professional large-scale mining, high-efficiency BTC output, maximum ROI operations | Medium-sized farms, water-cooling entry setups, cost-balanced operations |
| Main Advantages | Highest hashrate and best efficiency; significantly higher BTC production; ideal for industrial sites | Lower upfront cost; easier hydro deployment; stable performance with moderate hashrate |
| Considerations | Higher initial investment; requires strong cooling and power infrastructure | Lower hashrate and efficiency; slower ROI in high-electricity regions |
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Processing&Shipping Time
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Payment Policies
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Taxes and Custom Duties
Processing&Shipping Time
Payment Policies
Taxes and Custom Duties
All shipments will go out by UPS or DHL.
Please contact us if any documentations are requested by customs.
Our product are excluded of all value added taxes and customs duties sold by BT-Miners. You will be solely responsible for paying any outstanding taxes and duties as per your country’s law and customs. Client will be responsible for additional shipping charges if items are returned to sender.
Contact us at store@bt-miners.com or 813-820-0668 if you have any questions.
All products on our website are priced in US Dollars.
Payment made by credit or debit card may subject to card processing fees.
We can accept payment by credit/ debit card, wire transfer, ACH transfer (through our online portal), and crypto.
*Machine prices will fluctuate according to the current market price.*
All orders will be dispatch in the order which they were received. Pre-orders typically ships at the end of the month of the batch but may delay if manufacturer delays release/shipment. In stock machines ship in 3-7 business days from our warehouse in China. Bulk orders may release a few days later.
We always try to ship as soon as we can via USP or DHL after full payment has been received and verified.
International shipping usually takes about 5-8 business days. Due to changing regulations, we will not be able to cover duty tax for all orders entering USA. Deliveries to other countries may require customers to clear customs and pay duty tax. Please notify us right away if documents are requested by customs as improper filing may result in higher fees and/or delays.
All sales are final and non-refundable on any terms.
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FAQs
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What Is The Lifespan Of This Mining Machine?
The lifespan of mining hardware is influenced by usage intensity, environmental factors like temperature, humidity, and dust. Proper maintenance and optimal conditions can significantly extend its longevity.
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How Does Electricity Cost Impact Profitability?
Electricity costs play a crucial role in mining profitability, as high rates can quickly offset profit. Therefore, it is vital to access local electricity costs to determine if mining is viable. With high electricity costs and high liquidity of digital assets, investing in an energy-efficient miner becomes even more important.
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Regular coolant checks, tubing inspection, and pressure verification.
No. The XP+ model is more efficient. The S21 Hyd is positioned as a stable, mid-range liquid-cooled option.
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What maintenance is required?
Regular coolant checks, tubing inspection, and pressure verification.
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Can beginners use this miner?
It is recommended only for professional farms with the required electrical and cooling infrastructure.
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What makes the S21 Hyd more stable than air-cooled models?
Liquid cooling eliminates temperature spikes and keeps the chips within optimal thermal range.
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Is the cooling unit included?
No. A hydro-cooling system must be purchased separately.
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What kind of coolant should be used?
Deionized water or specialized industrial coolant recommended for mining environments.
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Is hydro-cooling quieter than air-cooling?
Yes. Water-cooled miners operate noticeably quieter since there are no high-speed fans.
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What coins does it support?
Any coin using SHA-256, including BTC, BCH, and BSV.
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Can this miner run on single-phase power?
No. It requires 380–415V three-phase power.
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Does the S21 Hyd require a special cooling system?
Yes. It must be connected to a hydro-cooling loop capable of maintaining stable coolant flow and temperature.
