Description
Antminer S21j XP Hydro 495TH/s Bitcoin Miner
The Antminer S21j XP Hydro is a professional SHA-256 ASIC miner manufactured by Bitmain for industrial Bitcoin mining farms, hydro-cooled containers, hosting centres and high-density data-centre installations. This model delivers a typical hashrate of 495TH/s while consuming approximately 5,940W.
With a rated energy efficiency of 12J/TH, the Antminer S21j XP combines powerful Bitcoin mining performance with direct liquid cooling. Instead of depending on high-speed chassis fans, the miner transfers heat into a controlled coolant loop connected to an external heat exchanger or dry-cooling system.
The Antminer S21j XP operates on the SHA-256 algorithm and is primarily designed for mining Bitcoin. It can also mine Bitcoin Cash, Bitcoin SV and other compatible SHA-256 cryptocurrencies through a suitable mining pool.
This is not a residential plug-and-play miner. The Antminer S21j XP requires 380–415V three-phase electricity, professional hydro-cooling infrastructure, Ethernet connectivity, proper rack support and trained technical installation.
Browse related machines in our ASIC miner collection, or compare professional cryptocurrency-mining equipment available from Hash Titans.
Antminer S21j XP Key Features
The Antminer S21j XP is built for operators who need substantial SHA-256 output from a compact hydro-cooled chassis. It is suitable for mining businesses with centralized electrical distribution, coolant circulation, heat rejection, network monitoring and emergency shutdown systems.
- Manufacturer: Bitmain
- Model: Antminer S21j XP Hydro
- Official abbreviated name: S21j XP Hyd
- Mining algorithm: SHA-256
- Typical hashrate: 495TH/s
- Typical power consumption: 5,940W
- Rated efficiency: 12J/TH
- Cooling method: Direct hydro cooling
- Input voltage: 380–415V AC
- Electrical configuration: Three-phase power
- Network interface: RJ45 Ethernet 10/100M
- Coolant flow: 8–10L/min
- Maximum coolant pressure: 3.5bar
- Net dimensions: 430 × 176 × 208mm
- Packaged dimensions: 570 × 316 × 430mm
- Net weight: Approximately 16.2kg
- Primary mineable coin: Bitcoin
- Additional SHA-256 coins: Bitcoin Cash and Bitcoin SV
- Application: Professional 24/7 mining
Antminer S21j XP Specifications
| Manufacturer | Bitmain |
|---|---|
| Model | Antminer S21j XP Hydro |
| Official product name | S21j XP Hyd |
| Mining algorithm | SHA-256 |
| Typical hashrate | 495TH/s |
| Power consumption | Approximately 5,940W |
| Power efficiency | 12J/TH |
| Cooling system | Hydro cooling |
| Input voltage | 380–415V AC |
| Electrical supply | Three-phase AC |
| Network connection | RJ45 Ethernet 10/100M |
| Miner dimensions | 430 × 176 × 208mm |
| Packaged dimensions | 570 × 316 × 430mm |
| Net weight | Approximately 16.2kg |
| Coolant flow | 8–10L/min |
| Maximum coolant pressure | ≤3.5bar |
| Supported working coolant | Approved antifreeze, purified water or deionized water according to Bitmain requirements |
| Antifreeze pH range | 7.0–9.0 |
| Purified-water pH range | 6.5–7.5 |
| Deionized-water pH range | 8.5–9.5 |
| Inlet coolant temperature | 20°C to 50°C |
| Storage temperature | −20°C to 70°C |
| Relative humidity | 10–90%, non-condensing |
| Listed warranty | 365 days, subject to the applicable seller and Bitmain terms |
| Supported networks | Bitcoin, Bitcoin Cash, Bitcoin SV and compatible SHA-256 networks |
Performance tolerance: Hashrate, wall power and energy efficiency can vary from their typical ratings because of manufacturing tolerance, coolant temperature, firmware mode, input voltage, ambient conditions and power quality.
Buyers should confirm the exact factory label, batch, coolant connection, electrical connector, firmware version and warranty coverage before ordering the Antminer S21j XP.
Antminer S21j XP Mining Overview
Algorithm
SHA-256
Hashrate
495TH/s
Power Consumption
5,940W
Antminer S21j XP Bitcoin Mining Performance
The Antminer S21j XP delivers a typical 495TH/s of SHA-256 mining output. This level of hashrate is intended for commercial farms where the miner can receive stable three-phase power, continuous coolant circulation and reliable Ethernet connectivity.
Actual accepted hashrate may fluctuate because of pool latency, coolant temperature, firmware, electrical conditions, chip quality, operating time and mining-pool share variance.
Operators should compare the miner’s local dashboard with pool-side accepted hashrate over several hours or days. A brief dashboard peak does not necessarily represent stable long-term output.
Important performance indicators include:
- Real-time hashrate
- Long-term average hashrate
- Accepted and rejected shares
- Hashboard status
- ASIC chip errors
- Coolant inlet temperature
- Coolant outlet temperature
- Coolant flow rate
- System pressure
- Measured wall power
- Pool latency
- Ethernet uptime
A sustained drop in Antminer S21j XP performance may indicate insufficient coolant flow, excessive coolant temperature, trapped air, poor electrical quality, unstable firmware, network interruption or a hashboard fault.
Antminer S21j XP 12J/TH Efficiency
The Antminer S21j XP is rated at approximately 12 joules per terahash. Dividing 5,940W by 495TH/s confirms the stated efficiency:
5,940W ÷ 495TH/s = 12J/TH
At a continuous 5,940W load, estimated miner-only electricity use is:
- 142.56kWh per day
- 997.92kWh per week
- 4,276.8kWh per 30-day month
- 52,034.4kWh per year
Estimated monthly electricity costs are:
- At $0.04/kWh: approximately $171.07
- At $0.05/kWh: approximately $213.84
- At $0.06/kWh: approximately $256.61
- At $0.08/kWh: approximately $342.14
- At $0.10/kWh: approximately $427.68
- At $0.15/kWh: approximately $641.52
- At $0.20/kWh: approximately $855.36
These estimates cover only the miner’s nominal electrical load. Pumps, coolant distribution units, dry coolers, heat exchangers, routers, monitoring equipment, transformers and distribution losses increase total facility consumption.
Bitcoin mining profitability is not guaranteed. Bitcoin price, network difficulty, transaction fees, block rewards, pool charges, electricity rates, cooling overhead, hardware price, uptime and maintenance all affect returns.
Antminer S21j XP Hydro-Cooling Requirements
The Antminer S21j XP requires an active liquid-cooling system capable of maintaining the specified flow, pressure, coolant quality and inlet temperature.
Coolant passes through internal cold plates, absorbs heat generated by the ASIC chips and transfers it to an external heat exchanger, dry cooler, cooling tower or heat-reuse system.
Required Coolant Conditions
- Recommended flow: 8–10L/min per miner
- Maximum pressure: 3.5bar
- Inlet coolant temperature: 20°C to 50°C
- Approved coolant: Follow Bitmain’s exact fluid and pH requirements
- Condensation: Must be prevented
- Circulation: Must begin before mining load is applied
Typical Hydro System Components
- Coolant distribution unit
- Circulation pump
- Supply and return manifolds
- Compatible hoses and quick connectors
- Flow meters
- Pressure sensors
- Temperature sensors
- Expansion reservoir
- Coolant filter
- Air-separation and bleeding points
- Heat exchanger
- Dry cooler or cooling tower
- Leak detection
- Emergency shutdown system
Hydro-Cooling Safety
- Flush newly installed pipes before connecting the miner.
- Use only fluids compatible with Bitmain requirements.
- Do not mix incompatible coolant types.
- Remove trapped air before startup.
- Monitor flow and pressure continuously.
- Inspect hoses, seals and connectors regularly.
- Keep electrical terminals dry.
- Prevent condensation around circuit boards.
- Shut down the miner if circulation stops.
- Do not exceed the listed pressure limit.
The Antminer S21j XP produces approximately 5.94kW of continuous heat. Hydro cooling transfers this heat efficiently, but the external facility must still reject or reuse it.
Mineable Coins with Antminer S21j XP
Bitcoin
Bitcoin is the primary cryptocurrency mined by the Antminer S21j XP.
Bitcoin Cash
The miner can mine Bitcoin Cash through a compatible SHA-256 mining pool.
Bitcoin SV
The miner is also technically compatible with Bitcoin SV and other suitable SHA-256 networks.
Other technically compatible coins may include eCash, Fractal Bitcoin, Peercoin and additional SHA-256 cryptocurrencies where suitable pools, wallets and exchange support exist.
Before switching networks, compare mining difficulty, expected revenue, block rewards, pool support, payout thresholds, wallet compatibility and market liquidity.
For general information about Bitcoin and proof-of-work mining, review the official Bitcoin educational resources.
Antminer S21j XP Mining-Pool Setup
The Antminer S21j XP connects to compatible SHA-256 mining pools through its RJ45 Ethernet interface. Pool mining combines the output of many machines and distributes rewards according to accepted shares and the selected payout method.
Before selecting a pool, compare:
- Pool fees
- Payout method
- Minimum payout threshold
- Server location
- Historical uptime
- Security controls
- Monitoring tools
- Backup-server support
- API and accounting features
Configuration normally requires a Stratum server address, worker name, password and payout account. Configure secondary and tertiary servers where supported to reduce downtime.
The network used by the Antminer S21j XP should include firewall protection, restricted administrative access, monitoring and backup connectivity where practical.
Antminer S21j XP Electrical Requirements
The Antminer S21j XP requires 380–415V AC three-phase power. It must not be connected to a conventional household single-phase socket.
At a nominal 5,940W load, approximate balanced three-phase current is:
- Approximately 9.03A per phase at 380V, assuming a power factor near 1
- Approximately 8.26A per phase at 415V, assuming a power factor near 1
Actual current can differ because of power factor, voltage tolerance, startup behaviour, operating mode, cable losses and measured wall consumption.
Electrical preparation may require:
- A grounded 380–415V three-phase circuit
- A correctly rated breaker or fused disconnect
- Manufacturer-approved cabling and connectors
- Proper conductor sizing
- Overcurrent protection
- Surge protection
- Phase monitoring
- Emergency shutdown controls
- Dry electrical terminations
- Compliance with local electrical regulations
A licensed industrial electrician should inspect and approve the installation before the Antminer S21j XP is energized.
Antminer S21j XP Installation Guide
- Inspect the miner and packaging for transport damage.
- Confirm the exact model and factory nameplate.
- Verify that the rack can support the machine safely.
- Confirm the 380–415V three-phase electrical supply.
- Flush new pipes and manifolds.
- Mount the miner in the approved position.
- Connect the coolant inlet and outlet correctly.
- Connect the miner to the supply and return manifolds.
- Fill and bleed the cooling loop.
- Confirm 8–10L/min coolant flow.
- Keep pressure at or below 3.5bar.
- Verify external heat-rejection operation.
- Inspect all connections for leaks.
- Connect the Ethernet cable.
- Connect the approved three-phase power cable.
- Start coolant circulation before powering the miner.
- Power on the machine.
- Locate the miner’s IP address.
- Open the Bitmain management interface.
- Change default credentials where supported.
- Configure primary and backup mining pools.
- Monitor hashrate, coolant flow, temperature, pressure and power.
During commissioning, monitor the Antminer S21j XP for coolant leaks, trapped air, abnormal pressure, insufficient flow, excessive temperature, electrical faults, rejected shares and hashboard errors.
Antminer S21j XP Maintenance
Scheduled maintenance helps the Antminer S21j XP maintain stable hashrate, safe coolant conditions and reliable continuous operation.
- Monitor coolant inlet and outlet temperatures.
- Check coolant flow and loop pressure.
- Inspect pumps, manifolds, hoses and connectors.
- Test coolant pH at the required intervals.
- Check coolant for contamination or degradation.
- Maintain filters according to schedule.
- Inspect heat exchangers and dry coolers.
- Bleed trapped air when required.
- Compare local and pool-side hashrate.
- Review rejected shares and hardware errors.
- Inspect electrical connections for heat damage.
- Back up miner settings before firmware updates.
- Use only official or authorized Bitmain firmware.
- Disconnect electrical power before servicing.
Review Bitmain’s hydro-miner maintenance recommendations before preparing a facility maintenance schedule.
Why Choose the Antminer S21j XP?
The Antminer S21j XP may suit commercial operators who want high SHA-256 output, 12J/TH efficiency and centralized hydro cooling in a compact industrial chassis.
- 495TH/s typical hashrate
- 5,940W nominal power consumption
- 12J/TH rated efficiency
- Direct liquid cooling
- 380–415V three-phase input
- RJ45 Ethernet connectivity
- 8–10L/min coolant flow
- Maximum 3.5bar coolant pressure
- Compact high-density chassis
- Support for BTC, BCH and BSV
- Designed for continuous professional mining
The main limitations are the requirement for three-phase electricity, coolant circulation, external heat rejection, leak protection, professional electrical installation and trained maintenance personnel.
Browse more Bitcoin ASIC miners to compare the Antminer S21j XP with other Bitmain air-cooled, hydro-cooled and immersion mining systems.
Antminer S21j XP Frequently Asked Questions
What is the Antminer S21j XP?
The Antminer S21j XP Hydro is a professional SHA-256 ASIC miner manufactured by Bitmain.
What is its typical hashrate?
The official product listing specifies 495TH/s.
How much power does it consume?
Its typical power consumption is approximately 5,940W.
What is its energy efficiency?
The miner is rated at 12J/TH.
Is the Antminer S21j XP the same as the S21 XP Hydro?
No. The S21j XP Hydro is listed at 495TH/s, while the earlier S21 XP Hydro is commonly rated at 473TH/s.
Which algorithm does it use?
It uses the SHA-256 mining algorithm.
Can it mine Bitcoin?
Yes. Bitcoin is its primary supported cryptocurrency.
Can it mine Bitcoin Cash?
Yes. Bitcoin Cash also uses SHA-256.
Can it mine Bitcoin SV?
Yes. Bitmain lists BTC, BCH and BSV as supported SHA-256 coins.
Is it air cooled?
No. The miner uses direct hydro cooling.
What coolant flow does it require?
The listed coolant flow is approximately 8–10L/min.
What is the maximum coolant pressure?
The coolant pressure should not exceed 3.5bar.
What voltage does it require?
It requires 380–415V AC three-phase electricity.
Can it run from a household socket?
No. It requires an industrial electrical installation.
What network connection does it use?
It uses RJ45 Ethernet 10/100M.
What are its dimensions?
The listed unpackaged dimensions are 430 × 176 × 208mm.
How much does it weigh?
The listed net weight is approximately 16.2kg.
How much electricity does it use daily?
At 5,940W, continuous operation consumes approximately 142.56kWh per day.
Is the Antminer S21j XP suitable for home mining?
No. Its three-phase power demand, coolant requirements and 5.94kW heat load make it unsuitable for an ordinary home.
Does it include a 365-day warranty?
The supplied listing states 365 days, but actual coverage depends on Bitmain’s terms, the seller, region, batch and purchase agreement.
Is the Antminer S21j XP profitable?
Profitability is not guaranteed. Bitcoin price, network difficulty, block rewards, transaction fees, pool fees, electricity rates, cooling overhead, hardware cost, repairs and uptime all affect results.
Buy Antminer S21j XP Hydro Mining Hardware
The Antminer S21j XP delivers a typical 495TH/s at approximately 5,940W with rated efficiency of 12J/TH. Its direct liquid cooling, Ethernet interface and compact industrial design make it a powerful option for professionally engineered Bitcoin mining facilities.
Before ordering, confirm the exact batch, factory label, electrical connector, coolant type, flow requirement, pressure limit, facility heat-rejection capacity and warranty. Visit Hash Titans to compare the Antminer S21j XP with other professional Bitcoin mining machines.
Technical information and hydro-miner support resources can also be reviewed through the official Bitmain support centre.
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