Bitmain Antminer S21e XP Hydro (860Th/s)

860 TH/s of SHA-256 hashrate at 11,180W continuous power draw and 13 J/TH efficiency. Bitmain's ±3% hashrate tolerance means real world output ranges 834 to 886 TH/s. This is Bitmain's prior generation 3U petahash class hydro miner, positioned below the current S23 Hyd 3U (1.16 PH/s at 9.5 J/TH) but at meaningfully lower acquisition cost reflecting the legacy inventory positioning. Official Bitmain model number U3S21EXPH.

Acquisition cost to deployment economics. The S23 Hyd 3U delivers 35 percent more hashrate and 27 percent better efficiency but typically commands 2 to 3 times the per unit acquisition cost. For operators with industrial electricity rates below $0.04 per kWh where electricity represents a smaller share of total operational cost, the S21e XP Hyd 3U acquisition savings outweigh lifetime efficiency penalty over typical 3 year deployment horizons. Scenarios favoring the S21e XP Hyd 3U: industrial hosting at $0.04 per kWh or lower, shorter deployment horizons (1 to 2 years), hardware budget constraints prioritizing unit count over per unit efficiency, fleet expansion alongside existing S21 series deployments, and speculative positioning where current BTC prices support strong margins even on less efficient hardware.

U3S21EXPH is Bitmain's official product model number for the S21e XP Hyd 3U, confirmed through ASIC Miner Value launch documentation and Kryptex Pool specifications. The "U3" prefix denotes the 3U rack mount form factor. Announced September 2024, began batch shipping from January 2025. MillionMiner's January 2024 release date listing reflects a documentation error (verified against multiple independent distributor sources).

Standard 3U rack mount chassis at 900 x 486 x 132 mm. Compatible with 19 inch server racks and industrial mining facility cabinets. The 900 mm chassis depth requires minimum 1000 mm rack depth for proper cable management, and 1200 mm rack depth provides comfortable cable and cooling access. Most dedicated mining facilities and data centers use 1000 mm or 1200 mm racks. Shallower 600 mm or 750 mm racks cannot accommodate this hardware. Verify facility rack inventory before committing to large fleet orders.

380 to 415V three phase industrial power service through LP34 industrial connector. At 415V three phase: approximately 15 amps per phase continuous, 25 amps per phase at peak. At 380V: approximately 17 amps per phase continuous. Maximum current draw per Bitmain documentation: approximately 24 amps. Requires dedicated 32 amp three phase breakers minimum for reliable operation. LP34 industrial connector requirement excludes any single phase commercial or residential deployment. Strictly industrial hardware for professional data center and dedicated mining facility deployment.

External closed loop water cooling system with substantial thermal capacity. Each unit generates approximately 11.2 kW thermal load (38,144 BTU per hour), requiring circulation pumps sized for fleet flow rate, dry cooler or water to water heat exchanger rated for total thermal load, inline particulate filtration, automated flow monitoring, and temperature management at inlet and outlet points. Multi unit deployments scale cooling infrastructure proportionally through manifold distribution with individual unit isolation valves for maintenance access. Budget $10,000 to $40,000 per rack for hydro cooling infrastructure depending on fleet size and existing facility capability.

Form factor and density tradeoffs against standalone alternatives. S21e XP Hyd 3U (this product): 860 TH/s at 11,180W and 13 J/TH in 3U rack format. S21 XP Hydro 473TH: 473 TH/s at 5,676W and 12 J/TH in compact standalone. S21+ Hydro 395TH: 395 TH/s at 5,925W and 15 J/TH in compact standalone. For operators wanting petahash class in 3U rack format at prior generation pricing, the S21e XP Hyd 3U wins. For operators wanting current generation efficiency at 3U format, the S23 Hyd 3U wins. For operators needing universal single phase voltage deployment, the S21 XP Hydro 473TH or S21+ Hydro 395TH single phase options are the relevant choice.

Mixed depending on electricity rate. MillionMiner $0.08 per kWh onsite calculator: $28.02 daily revenue, $21.47 electricity, $6.55 daily net profit. Mining Now February 2026 at $0.07 per kWh: $30.81 daily revenue, $18.78 electricity, $12.03 daily net. ASIC Miner Value at $0.10 per kWh: $7.26 daily profit. OneMiners May 2025 data at aggressive $0.01 per kWh hosting rates: $40 to $50 daily earnings, averaging $44. ROI estimates: 906 to 1,850 days at $0.07 per kWh per Mining Now, compressed to approximately 12 months at $0.04 per kWh industrial hosting per OneMiners.

50 dB chassis noise, effectively silent due to the absence of cooling fans. The external cooling infrastructure generates acoustic signature separately: pumps typically run 45 to 55 dB, dry coolers typically 55 to 70 dB depending on airflow requirements. Professional hydro cooled mining facilities isolate miner deployment space from cooling plant locations to minimize acoustic impact. Total deployment noise depends substantially on cooling infrastructure design and placement relative to miner deployment space.

No. The 11,180W power draw requires 380 to 415V three phase industrial electrical service with LP34 industrial power connector, unavailable in residential settings. The 11.2 kW thermal load requires substantial external water cooling infrastructure impractical for residential installation. The 900 mm chassis depth requires industrial grade rack hardware. Strictly industrial hardware for professional mining facilities and commercial data centers. For home deployment seeking hydro cooling, the Antminer S21+ Hydro 395TH with 100 to 240V universal single phase voltage represents the residential ceiling option.

Industrial deployment with three phase power, LP34 connectors, and hydro cooling infrastructure. Step one: install dedicated 380 to 415V three phase electrical service with LP34 industrial connectors and 32 amp three phase breakers minimum. Step two: install and commission external hydro cooling loop with pumps, plumbing, coolant fill, dry cooler infrastructure, and temperature monitoring. Step three: rack mount units in 19 inch server racks verifying 1000+ mm rack depth. Connect water fittings to manifold system with individual isolation valves. Verify zero leaks before energizing. Step four: connect LP34 power cables and Ethernet management. Step five: power on, allow coolant flow to stabilize, find miner IP through DHCP, configure pool URL and Bitcoin wallet through Bitmain web interface, verify hashrate reaches 834+ TH/s within 15 to 20 minutes per unit.

Industrial hydro cooling maintenance. Weekly visual inspection of water fittings for leaks or corrosion. Monthly coolant quality testing. Every 12 to 24 months full coolant replacement. Quarterly pump and dry cooler inspection including flow rate verification. Inline filter replacement when pressure differential exceeds specification. LP34 connector inspection quarterly. Hashboard failure rates on hydro units run meaningfully lower than air cooled equivalents. As 2025 era legacy hardware, anticipate higher spare parts needs than current generation S23 equivalents. Budget 5 percent of acquisition cost annually for maintenance reserves on prior generation hardware.

Any SHA-256 proof of work cryptocurrency. Bitcoin (BTC) is the primary target. Other compatible coins include Bitcoin Cash (BCH), Bitcoin SV (BSV), Fractal Bitcoin (FB), Namecoin (NMC), DigiByte (DGB SHA-256 chain). Merged mining BTC alongside BCH and BSV through supporting pools (ViaBTC, F2Pool) adds marginal secondary revenue without reducing Bitcoin hashrate contribution.

42U rack holds 14 units producing 12.04 PH/s aggregate at approximately 156 kW total power. 100 kW industrial electrical panel: approximately 8 to 9 units producing 6.88 to 7.74 PH/s aggregate. Compare alternatives at the same power budget. 100 kW of S23 Hyd 3U: 9 units producing 10.44 PH/s (35 percent more aggregate at newer generation efficiency). 100 kW of S21 XP Hydro 473TH standalone: 17 units producing 8.04 PH/s (4 percent more aggregate at universal voltage compatibility). The S21e XP Hyd 3U positions between these options on aggregate hashrate per kilowatt.

Bitmain 365 day factory warranty on the complete machine covering manufacturing defects and hardware failures under normal operation within specified environmental ranges. Warranty exclusions include damage from coolant quality neglect, leaks caused by improper fitting installation, physical damage during cooling loop maintenance, power surge damage from inadequate electrical protection, operation outside specified environmental ranges, and unauthorized firmware modifications. Document coolant testing schedule and maintenance records to protect warranty coverage. MillionMiner routes warranty claims through direct Bitmain channels. As 2025 era hardware shipping from distributor inventory, verify current warranty start date with purchase batch.

Yes. MillionMiner operates managed hosting facilities with 380 to 415V three phase industrial power, LP34 industrial connectors, and hydro cooling infrastructure capable of supporting S21e XP Hyd 3U deployments. Hosted deployment eliminates facility infrastructure CapEx and leverages negotiated industrial electricity rates typically $0.04 to $0.06 per kWh. At $0.04 per kWh hosting rates, OneMiners documents approximately 12 month ROI per unit. Contact MillionMiner sales through the Get a Quote button for hosting pricing and deployment timelines.

Any Stratum compatible Bitcoin pool. Foundry USA leads by network hashrate share. F2Pool has the longest operational track record. AntPool is the native Bitmain ecosystem pool. ViaBTC offers accumulation mode payouts. Luxor supports hashrate derivatives. For fleet deployments above 10 PH/s (equivalent to 12+ units), direct negotiated agreements with major pools typically secure reduced fees below standard rates.

CapEx beyond miner acquisition: three phase electrical service with LP34 connectors ($10,000 to $30,000 per facility), hydro cooling infrastructure ($10,000 to $40,000 per rack), industrial rack hardware ($2,000 to $5,000 per rack). Annual OpEx per unit at 11,180W continuous: electricity at $7,835 at $0.08 per kWh, $6,855 at $0.07 per kWh, $3,917 at $0.04 per kWh industrial hosting rates. Water glycol coolant maintenance and spare parts reserves. 3 year TCO per unit at $0.07 per kWh self hosted: approximately $11,649 hardware plus $20,565 electricity plus $2,000 maintenance equals $34,214 total. 3 year gross revenue at $0.07 per kWh profitability: approximately $13,200 to $17,600 depending on BTC price scenarios.

Run the math with supplier specific pricing. Illustrative scenario: if S23 Hyd 3U costs $30,000 and S21e XP Hyd 3U costs $12,000 per unit, the $18,000 price differential on the newer hardware must be recovered through efficiency savings. At 1,160 TH/s versus 860 TH/s (300 TH/s more on newer hardware) and 9.5 J/TH versus 13 J/TH efficiency gap, per year electricity savings on the newer hardware run approximately $2,600 at $0.07 per kWh. The $18,000 price differential would take 7 years to recover through pure efficiency, but the newer hardware also delivers higher revenue through 35 percent more hashrate. Factoring both efficiency savings and additional revenue, price differential recovers in approximately 18 to 30 months depending on BTC price scenarios. At deployment horizons beyond 2 years with current BTC price levels, S23 Hyd 3U typically wins. Below 18 months or at deeply discounted S21e XP pricing, the value play works.

Within Bitmain S23 generation (newer, higher efficiency): S23 Hyd 3U at 1.16 PH/s for flagship petahash, S23 Hydro 580TH standalone for single unit compact deployment, S23 Air 318TH for air cooled, S23 Immersion 442TH for tank deployment. Within Bitmain S21 generation (same era, universal voltage): S21 XP Hydro 473TH for single phase standalone, S21+ Hydro 395TH for universal voltage deployment without three phase, S21e XP Hyd 430TH for lower tier 3U alternative. For operators diversifying across manufacturers at the petahash hydro tier: Whatsminer M79S 1.35 PH/s represents MicroBT's equivalent high power hydro tier, Whatsminer M73S+ 540TH provides lower tier hydro rack mount. Cross algorithm fleet diversification: Antminer KS7 for Kaspa, Antminer L11 for Litecoin and Dogecoin merged mining, IceRiver AE3 for Aleo, Antminer Z15 for Zcash. For operations building modular long lifespan infrastructure: Proto Rig at 819 TH/s provides Block's modular 10+ year chassis alternative. MillionMiner's ASIC hosting service accepts S21e XP Hyd 3U units at negotiated industrial electricity rates.