Product Overview

The Bitmain Antminer S21e XP U3 Hydro 860T is an ultra-high-output hydro-cooled Bitcoin (BTC) SHA-256 ASIC miner delivering an extraordinary 860 TH/s at approximately 9,460W. The “U3” designation indicates this unit contains three hashing boards in a single chassis — essentially three S21e XP Hydro units combined into one physical enclosure. This delivers triple the hashrate per physical unit compared to single-board hydro miners, enabling exceptional hashrate density in data centre deployments.

With 860 TH/s, the S21e XP U3 Hydro 860T is one of the highest-hashrate single-chassis Bitcoin mining units available from Bitmain. Its 9,460W power draw places it in a category that requires three-phase industrial electrical supply — well beyond standard mining circuit requirements. The hydro-cooling loop must also handle the substantially elevated thermal load of three hashing boards running simultaneously.

For South African operators, the S21e XP U3 Hydro 860T is strictly a large-scale commercial and industrial mining proposition. The combination of extreme power requirements, three-phase supply needs, and high-complexity hydro-cooling infrastructure means this unit is only practical for the largest, most professionally managed Bitcoin mining operations in South Africa.

Key Features

• 860 TH/s SHA-256 Hashrate (±3%): One of the highest-hashrate single-chassis Bitcoin miners available. Triple-board design delivers exceptional per-unit contribution to SHA-256 mining pools.
• Triple-Board U3 Architecture: Three S21e XP hashing boards in a single chassis — maximising hashrate per physical unit and minimising the number of units required for large-scale deployment targets.
• Hydro-Cooled High-Capacity Design: The three-board configuration requires a high-capacity hydro-cooling loop capable of handling 9,460W of continuous heat rejection. Purpose-designed cooling infrastructure is essential.
• ~11 J/TH Power Efficiency: Consistent with the S21e XP platform’s efficiency profile at scale.
• 9,460W Power Consumption: Industrial-grade power draw requiring three-phase electrical supply and substantial circuit infrastructure.
• Near-Silent Operation: No high-speed fans — operates near-silently despite the enormous thermal load managed by the liquid cooling system.
• Maximum Hashrate Density: The U3 triple-board design delivers more TH/s per square metre and per cooling loop connection than single-board hydro miners.

Technical Specifications

• Algorithm: SHA-256
• Supported Coins: Bitcoin (BTC), Bitcoin Cash (BCH), and other SHA-256 cryptocurrencies
• Hashrate: 860 TH/s (±3%)
• Power Consumption: ~9,460W (±5%)
• Power Efficiency: ~11 J/TH
• Cooling Type: Hydro-cooled (high-capacity liquid cooling loop required)
• Noise Level: Near-silent (no fans)
• Board Configuration: Triple-board (U3) design
• Input Voltage: Three-phase supply (confirm specifications at time of purchase)
• Networking: Ethernet (confirm configuration at time of purchase)
• Power Supply: Confirm inclusion and specifications at time of purchase

Power & Installation Notes

The Antminer S21e XP U3 Hydro 860T draws approximately 9,460W continuously — one of the highest power draws of any single mining chassis available. In South Africa, this unit requires three-phase power supply, high-amperage dedicated circuits, and certified electrical installation complying with SANS 10142. This is beyond standard single-phase mining circuit planning and requires industrial electrical engineering expertise.

The hydro-cooling infrastructure requirement for a three-board unit is substantially more demanding than for single-board hydro miners. The cooling loop must handle 9,460W of continuous heat rejection — requiring commercial-grade circulation pumps, large-diameter coolant piping, and a correspondingly sized dry cooler or cooling tower. Specialist hydro-cooling integrators with experience in high-density Bitcoin mining deployments are essential for correct installation.

Load shedding at 9,460W is completely unmanageable without industrial-grade generator backup rated for at least 15 kVA continuous output. Any operations requiring continuous uptime through South African load-shedding stages must invest in appropriately sized commercial generation capacity.

Electricity Cost Context — South Africa

At R2.80/kWh reference tariff, the estimated monthly electricity cost is:

(9460 ÷ 1,000) × 24 × 30 × 2.80 = R19071.36 per month

This is an operating cost estimate only. At this scale, operations will be on commercial or industrial electricity tariffs that may differ significantly from residential reference rates. The S21e XP U3 Hydro 860T’s U3 architecture achieves economies of scale — three times the hashrate from a single cooling loop connection and a single unit’s management overhead. Per-TH electricity cost is consistent with the S21e XP platform efficiency.

Ideal Use Cases

• Large-scale Bitcoin data centres: The S21e XP U3 Hydro 860T is designed for industrial-scale Bitcoin mining data centres where maximising hashrate density per cooling loop, per circuit, and per management connection is the primary design objective.
• Maximum hashrate density deployments: The triple-board design maximises TH/s per cooling loop connection and per physical unit — the most efficient configuration for operations targeting maximum aggregate hashrate.
• Professional Bitcoin mining infrastructure: Only suitable for operations with the engineering expertise, facility infrastructure, and scale to properly deploy and manage this class of equipment.
• Commercial renewable energy Bitcoin mining: South African operations with large-scale PPA or industrial electricity access and proper infrastructure can achieve competitive Bitcoin mining economics with this platform.

Frequently Asked Questions

What does “U3” mean?
“U3” indicates this unit contains three hashing boards in a single chassis — three times the hashrate of a single-board equivalent. This maximises hashrate density but requires proportionally more power and cooling capacity.

What are the electrical requirements?
Three-phase power supply is required. Confirm exact voltage, phase, and amperage specifications with Bitmain or your supplier at time of purchase. This is beyond standard single-phase ASIC mining circuit planning.

Is this suitable for any operation smaller than large-scale commercial?
No. The 9,460W draw, three-phase supply requirement, and high-capacity hydro-cooling needs make this exclusively suited to industrial-scale Bitcoin mining data centres.

What cooling infrastructure is required?
A high-capacity closed-loop liquid cooling system capable of handling 9,460W of continuous heat rejection is required. Specialist hydro-cooling integrators with industrial Bitcoin mining experience should design and install this system.

Is the PSU included?
Confirm at time of purchase — power supply configuration for three-phase U3 units differs from standard single-board miners.

What’s Included

• 1× Bitmain Antminer S21e XP U3 Hydro 860T mining unit
• High-capacity cooling manifold/connections (confirm specifications at time of purchase)
• Power supply (confirm inclusion and specifications at time of purchase)
• Power cables
• Quick-start documentation