Lesotho Bitmain Antminer S21j XP Hydro Bitcoin Miner

The S21j XP Hyd. is a purpose-built Bitcoin ASIC designed for data-center scale deployments that require high hash density with minimal acoustic noise and superior thermal control. Its integrated liquid-cooling system lets operators push sustained performance while lowering ambient heat load and enabling closer rack packing.

if you're curious about what kind of cooling system they need to work with, you can check out our Liquid Cooling System catalog, which will have a cooling solution for you
If you want to know the ROI of this mining machine, you can click here .

1. Hashrate vs. Inlet Coolant Temperature

Key benefits

Liquid cooling for sustained throughput — superior heat extraction for longer continuous runtime at peak hash rates.

Compact, rack-friendly design — high hash / m³ for data centers and container farms.

Lower ambient heat & acoustic profile — removes the need for massive airflow and reduces noise exposure in ops rooms.

Remote fleet management — secure web UI, API and SNMP for monitoring, firmware updates and alerts.

Serviceability & modularity — hot-swappable power modules and easy access to hashing boards.

Energy-optimized operation — built to deliver competitive J/TH efficiency under liquid-cooled conditions.

Typical specifications 

Model: S21j XP Hyd.

Cooling: Liquid-cooled (closed loop / facility chilled water compatible)

Hashrate (typical): ~220 TH/s

Power consumption (at ASIC): ~3,300 W (liquid-cooled system total will vary by facility loop)

Efficiency: ~15 J/TH

Operating voltage: 200–240 VAC (single or three-phase options available)

Network: 1× Gigabit Ethernet (management)

Dimensions (HxWxD): 2U / 3U rack-equivalent form factor (manufacturer dependent)

Weight: ~35–45 kg (depends on coolant loop fittings & PSU)

Operating temp: -5°C to 40°C (ambient, per facility coolant specs)

Connectivity: Web UI, SSH, SNMP, REST API for fleet management

Certifications: CE / RoHS (region dependent)

Warranty: 12 months standard (extended coverage available)

Features

Closed-loop liquid cooling interface (standard fittings for facility integration)

Multi-board ASIC stack with reinforced mounting and vibration control

Redundant power supply options and high-efficiency PSUs

IPv4/IPv6 networking, DHCP and static IP support

Onboard web interface + remote management API & SNMP traps

Built-in telemetry: hash rate, temperature (chip and coolant), voltage, fan/pump status, uptime, alarms

Safety: leak detection, automatic throttling on anomaly, and hardware interlocks

Warranty and optional extended service packs (region dependent)

Deployment & integration notes

Facility cooling: Integrates with closed-loop facility cooling or external heat exchangers. Confirm piping (G1/2, BSP, or metric) and flow requirements with your facilities team.

Power provisioning: High continuous power draw — plan for dedicated circuits and redundant feeds where possible. Consider 3-phase distribution for efficiency.

Monitoring: Use the built-in telemetry with your NMS or mining-management platform for automated alerts and throttling policies.

Noise & placement: Liquid cooling drastically reduces acoustic output from fans, enabling non-isolated ops rooms for some deployments.

SHIPPING DETAILS

1. Shipments will be scheduled on a first-paid-first-ship basis for orders on which lianli has received full payment.

2. You are responsible for any customs delays or returned shipments due to a lack of proper documentation. It's highly recommended to be aware of local customs clearance policies and prepare all customs documentation ahead of time to avoid delays or unexpected costs.

Return and exchange policy:

1. Domestic customers: Within 7 days of receiving the goods, our quality department confirms that it is a product quality problem;
2. Overseas customers: Within 15 days of receiving the goods, our quality department confirms that it is a product quality problem;
3. The outer packaging is damaged, and abnormalities occurring during transportation are not within the scope of return or exchange (please contact the freight company for claim settlement, and our company can assist with claim settlement);
4. We only provide after-sales service to customers who purchase directly. If you purchase our products from a dealer or a third party, please contact the seller for after-sales service;
5. The product cannot be disassembled after receipt, and cannot be modified or repaired without our permission. Keep the outer packaging and keep the labels intact, otherwise no after-sales service will be provided.