Bitmain Antminer S21j XP Hyd Bitcoin Miner 495Th/s 5940W Hydro-cooling
Antminer S21j XP Hyd represents the pinnacle of Bitmain engineering—a hydro-cooled monster designed for miners who demand the absolute best. With 495 TH/s of raw power and exceptional 12 J/TH efficiency, this is the miner that will define the next generation of Bitcoin mining.
$8,410.00
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Inventory: In Stock, deliver after payment
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Bitmain Antminer S21j XP Hyd
Algorithm
SHA-256
Hashrate
495Th/s
Power
5940W
Minable coins
BTC
BCH
BSV
- All miner include PSU
- Technical Support
- Low-value Declaration
- Machine detection
Bitmain Antminer S21j XP Hyd (495Th): Industrial-Grade Hydro-Cooled Bitcoin Miner
The Pinnacle of SHA-256 Mining Performance
The Bitmain Antminer S21j XP Hyd (495Th) represents the absolute forefront of Bitcoin mining technology. Engineered for the SHA-256 algorithm and purpose-built for BTC (Bitcoin) , this hydro-cooled powerhouse delivers unprecedented hashrate with remarkable efficiency—setting a new standard for industrial-scale mining operations.
Antminer S21j XP Hyd Redefines Bitcoin Mining
⚡️ Massive 495 TH/s Hashrate
With a staggering 495 TH/s, the S21j XP Hyd delivers computational power that was unimaginable just years ago. This isn’t just an incremental upgrade—it’s a quantum leap forward. Whether you’re expanding an existing mining farm or building a new facility, every terahash translates directly to greater Bitcoin earning potential.
🔋 Exceptional 12 J/TH Efficiency
In Bitcoin mining, efficiency is profitability. The S21j XP Hyd achieves an outstanding 12 J/TH, consuming just 5940W to deliver its massive hashrate. This represents a significant efficiency gain over previous generations, dramatically reducing your electricity costs per Bitcoin mined. Lower operational overhead means higher margins, even during market fluctuations.
💧 Advanced Hydro-Cooling Technology
Unlike traditional air-cooled miners, the S21j XP Hyd leverages state-of-the-art hydro-cooling to maintain optimal operating temperatures. This sophisticated cooling system delivers multiple competitive advantages:
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Sustained Peak Performance – No thermal throttling, even under maximum load
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Ultra-Quiet Operation at 50dB – Perfect for noise-sensitive environments
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Extended Hardware Lifespan – Reduced thermal stress on critical components
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Higher Density Deployment – Pack more hashrate into your facility
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Lower Facility Cooling Costs – Reject heat directly through liquid cooling infrastructure
Specifications of Antminer S21j XP Hyd
| Manufacturer | Bitmain |
| Model | Antminer S21j XP Hyd |
| Release | Mar 2026 |
| Hashrate, Th/s | 495Th/s |
| Power on wall @25°C, Watt | 5940W |
| Power efficiency on wall @25°C, J/T | 12j/Th |
| Noise Level | 50dB |
| Cooling | Hydro Cooling |
| Algorithm | Cryptocurrency | SHA256 | BTC/BCH/BSV |
Detailed Characteristics
Power Supply
| Power supply AC Input voltage range V | 380-415V AC |
| Power supply AC Input Frequency Range, Hz | 50~60 |
| Power supply AC Input current, Amp | 20 |
| Adapted AC Output power requirement W | 4000 |
Hardware Configuration
| Networking connection mode | RJ45 Ethernet 10/100M |
| Miner Size (Length*Width*Height, w/o package),mm | 410 x 170 x 209mm |
| Miner Size (Length*Width*Height, with package), mm | 500x 260 x 300mm |
Environment Requirements
| Operation temperature,°C | 5 – 45 °C |
| Storage temperature,°C | 0~70 |
| Operation humidity(non-condensing) , RH | 5~95% |
| Operation altitude, m | ≤2000 |
| Weight | 20 kg |
|---|---|
| Dimensions | 41 × 17 × 20.9 cm |
| Manufacturer | Bitmain |
| Hashrate, TH/s | 495Th/s |
| Power | 5940W |
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In-Stock Miners: Shipped within 3 business days. Bulk orders may require an additional 1-2 days for processing via DHL Express, UPS, FedEx, or TNT.
Pre-Order Miners: Delivery times depend on factory production schedules. Estimated dates are listed on the product page, but slight delays may occur due to manufacturing adjustments.
Order Processing: We operate on a first-paid, first-shipped basis. Once payment is confirmed, we dispatch your order promptly.
Bank Transfers (T/T): Verification takes 3-7 business days.
Cryptocurrency Payments: Typically processed within a few hours to 1 business day.
International Shipping: Most orders arrive in 5-8 business days. Remote areas may take 8-10 days.
Note: All sales are final—no refunds or returns. This is standard practice in our industry.
All products listed on our website are priced in US Dollars.
We accept payments via bank wire transfer or online cryptocurrency payment (BTC, ETH, KAS, USDT, USDC).
If you prefer offline payment, you can contact our online customer service.
Verify and only use the official collection accounts below:
TRC20 Start：TWPc8y End：ZAEHvT7b
TRC20 Start：TXjmjuw End: XiHnxjc9
ERC20 Start：0xbca5ff End：fc74050b
SOL Start：DGvECc6k End： dsmUnYsaQL
Cold wallet:
SOL Start：TU5hjN End： ZwwPkfuK
USD bank account :
Bank name: Asia Account
Starts with 798, ends with 946
US account
Starts with 820, ends with 154
Note: Offline orders are only valid when placed within the social media group that includes our CFO, Lili.
(WeChat / Telegram / WhatsApp: +86 17868116983)
Important: All cryptocurrency payments received on the website are automatically converted to USDT. If a product is out of stock, we will contact you for a refund. The refund will be based on the USD price at the time of your original order.
We offer hassle-free DDP shipping to select destinations, including:
✅ United States | ✅ Canada | ✅ UAE (Dubai) | ✅ Select EU Countries
Need DDP? Contact our support team before ordering.
For Non-DDP Shipments:
Customs duties and import taxes are not included in your order total and must be paid upon delivery.
To help reduce potential fees, we can provide a lower declared value on the commercial invoice (upon request).
Important:
If customs requires additional documents, notify us immediately to avoid delays or extra charges.
We’ll supply all necessary paperwork (e.g., commercial invoice, packing list) to ensure smooth clearance.
Tip: Contact your local courier (DHL/UPS/FedEx) directly to handle duty payments swiftly.
New Miners (Factory-Sealed):
Warranty Period: 6–12 months (varies by manufacturer, starting from production date).
Voided If: Damage occurs due to misuse, failure to follow instructions, or unauthorized modifications.
Used Miners:
No warranty or after-sales service is provided.
Pre-Shipment Verification: Testing videos will be shared for your approval before shipment. Once confirmed, the sale is final.
Returns & Repairs:
Buyer Responsible for all return shipping and related costs.
Repair Timeframe: Depends on the issue’s complexity (we’ll provide an estimate upon assessment).
Note: All sales are final—please inspect testing materials thoroughly before confirming used miner orders.
The Antminer S21j XP Hyd is Bitmain’s latest-generation, high-performance ASIC miner engineered for the SHA-256 algorithm. Released in March 2026, it represents a significant leap in hydro-cooling technology, specifically designed for mining Bitcoin (BTC) at an industrial scale. Its flagship status comes from delivering an extraordinary 495 Th/s hash rate while achieving an industry-leading power efficiency of just 12 J/TH.
The “XP” designation typically indicates an “Xtreme Performance” variant within Bitmain’s product lineup. For the S21j XP Hyd, this translates to superior efficiency metrics—achieving 12 J/TH—compared to standard models. It represents Bitmain’s commitment to pushing the boundaries of ASIC efficiency, targeting miners for whom electricity cost is the primary operational concern.
The integrated hydro-cooling system offers several critical benefits for professional operations:
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Superior Thermal Management: Liquid cooling maintains optimal chip temperatures more effectively than air cooling, reducing thermal stress on ASIC components.
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Extended Hardware Lifespan: Consistent low-temperature operation can significantly extend the operational life of the miner.
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Reduced Noise: At 50 dB, this miner operates dramatically quieter than air-cooled equivalents (typically 75+ dB), making it approximately 60-70% quieter.
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Higher Density Deployment: Hydro-cooling allows for tighter packing of miners in data centers since heat is removed via liquid rather than exhaust air.
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Stable Performance: Precise temperature control helps maintain peak hash rate (495 Th/s) consistently, even in warmer environments.
No. This is a critical consideration. The S21j XP Hyd is not a standalone unit. It requires connection to a complete external liquid cooling infrastructure, including:
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Cooling Distribution Unit (CDU): Manages coolant flow and temperature.
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Pumps and Piping: Circulates coolant to and from the miners.
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Heat Exchangers: Radiators or dry coolers that dissipate heat to the external environment.
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Coolant: Specialized dielectric or water-glycol mixture.
This makes it suitable only for professional mining farms, large-scale hosting facilities, or industrial data centers with the requisite infrastructure.
Profitability depends on three dynamic factors: Bitcoin’s market price, network mining difficulty, and most critically, your electricity cost per kWh.
Based on its 12 J/TH efficiency and 5,940W power draw:
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At $0.10 per kWh, daily electricity cost is approximately $14.26.
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At $0.06 per kWh (common for large farms), daily electricity cost drops to $8.55.
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At $0.04 per kWh (hydro-optimized hosting), daily electricity cost is just $5.70.
Sample Profitability: With Bitcoin at $60,000 and network difficulty at current levels, estimated daily revenue for 495 Th/s is approximately $25-$30. This yields potential daily net profits of:
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$10.74 – $15.74 at $0.10/kWh
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$16.45 – $21.45 at $0.06/kWh
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$19.30 – $24.30 at $0.04/kWh
You must use a real-time mining profitability calculator with your exact power costs for an accurate assessment.
The S21j XP Hyd requires industrial-grade power infrastructure:
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Voltage: 380-415V three-phase AC (typical for data centers)
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Current: Approximately 8-10A per phase at full load
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Connection: Requires hardwiring to a professional power distribution unit (PDU)
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Circuit Protection: Dedicated breakers and proper grounding are essential
Standard residential or commercial 220V single-phase power is insufficient for this miner.
A complete hydro-cooling loop must include:
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Cooling Distribution Unit (CDU): Sized to handle the thermal load of multiple miners.
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Piping: Properly insulated and sized for flow rate.
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Heat Rejection: Dry coolers, cooling towers, or heat exchangers rated for the total system heat output (approximately 20,000+ BTU per miner).
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Coolant Management: Monitoring for flow rate, temperature, and coolant condition.
Many large farms deploy these miners in dense racks where 8-12 units share a single CDU .
Common payment options include:
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Cryptocurrency: BTC, USDT (TRC20/ERC20), USDC
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Bank Wire Transfer (T/T): Standard for large orders; verification takes 3-7 business days
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Stablecoin settlements are often automatically converted at transaction time
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Customer FAQs
We offer special discounts and holiday deals from time to time. You can visit our website or join our TG group (https://t.me/xonmining_china) for the latest information. We suggest you join our TG group, as our discount offers are usually announced first there.
Of course, we also offer wholesale prices for bulk orders. For large orders, we will provide customized discounts and exclusive service support to help you purchase ASIC Miners at the most competitive market prices. You can contact us at any time via email (contact@xonmining.com) or Whatsapp(+86 13631656695).
Yes, you can definitely pick up your machine yourself. Our warehouse is in Hong Kong, China. You can pick it up yourself or have it delivered to your freight forwarder.
Yes, we sell brand new, factory-sealed Miners. We purchase equipment directly from the factory to ensure that all products are brand new and unused.
Under normal circumstances, miners are directly dispatched from the warehouse without the need to open the package. Only when requested by the customer will we open the package for testing and take photos for record before shipment.
Similarly, for some models that have been on sale for a longer time, we also offer second-hand Miners for sale. Customers who have the need to purchase second-hand equipment are also welcome to contact us at any time.
We have no minimum order quantity limit. We serve miners of all sizes and understand the needs and concerns of various types of investors. Contact our professional sales team, and they will solve most of your problems.
Sure - you just need to follow these steps to ensure the security of your order
As confirmed on the official certification page of 1. First of all, through our XON MINING, staff identity: https://xonmining.com/about-us/
2. Place orders only within the social media group with CEO Jack (wechat /TG/Whatsapp: +86 13631656695)
3. Make payments only through our official collection account:
TRC20 Start: TWPc8y End: ZAEHvT7b
TRC20 Start: TXjmjuw End: XiHnxjc9
ERC20 Start: 0xbca5ff End: fc74050b
SOL Start: DGvECc6k End: dsmUnYsaQL
USD bank account :
Bank name: Asia Account
Starts with 798, ends with 946
US account
Starts with 820, ends with 154
Following these steps can ensure that your payment funds reach the right place and that your transaction is fully protected.
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