Bitmain Antminer S21 XP+ Hyd (500Th)

500 TH/s of SHA-256 hashrate at 5,500W continuous power draw and 11 J/TH efficiency. Bitmain's ±3% hashrate tolerance means real world output ranges 485 to 515 TH/s. ±5% power tolerance means wall draw can reach 5,775W at peak. This is Bitmain's premium S21 generation three phase hydro option, positioned between the legacy S21e series (13 J/TH) and the newer S23 Hydro flagship (9.5 J/TH). For operators balancing efficiency and acquisition cost on 2 to 3 year deployment horizons, the 11 J/TH efficiency delivers strong economic fit without the premium pricing of S23 generation hardware.

No, but it represents strong efficiency in the premium mid tier. Current best efficiency tier (9.5 J/TH): S23 Hydro 580TH and S23 Hyd 3U 1.16 PH/s. Premium mid tier (11 J/TH): S21 XP+ Hyd 500TH (this product). Strong mid tier (12 J/TH): S21 XP Hydro 473TH. Legacy tier (13 to 15 J/TH): S21e XP Hyd 3U 860TH, S21+ Hydro 395TH, air cooled S23. For operators prioritizing absolute efficiency regardless of acquisition cost, the S23 Hydro 580TH wins. For operators balancing efficiency against hardware budget, the S21 XP+ Hyd 500TH positions competitively.

380 to 415V three phase industrial power service. At 415V three phase: approximately 13 amps per phase continuous, 23 amps per phase at peak draw. At 380V three phase: approximately 14 amps per phase continuous. Requires dedicated 20 amp three phase breakers minimum. Connector specification: OneMiners batch documentation references P33 connector 6 pin with notation "1-3 phases like S21 miner" suggesting possible single phase compatibility in certain batch configurations. BT-Miners explicitly requires three phase only deployment. Recommend verifying connector and phase requirements with MillionMiner before ordering for single phase deployment scenarios.

S23 Hydro 580TH delivers the flagship position at $14,299 with 16 percent more hashrate and 14 percent better efficiency (9.5 versus 11 J/TH). S21 XP+ Hyd 500TH at $9,500 represents the value position at 50 percent lower acquisition cost per unit. Economic breakeven calculation: at $0.07 per kWh industrial rates, the efficiency gap translates to approximately $0.75 daily electricity difference per equivalent output unit. Across a 10 unit deployment over 3 years, the S23 Hydro savings total approximately $8,200 versus S21 XP+ Hyd 500TH. The $4,799 price differential per unit ($47,990 across 10 units) would take approximately 6 years to recover through pure efficiency savings. Accounting for the additional hashrate revenue on the S23 Hydro, break even compresses to 24 to 36 months depending on BTC price scenarios. Deployment horizons beyond 3 years favor S23 Hydro. Below 24 months or at meaningful price differentials beyond the illustrative $4,800 gap, the S21 XP+ Hyd value play strengthens.

Different form factors and efficiency tiers. S21 XP+ Hyd 500TH (this product): 500 TH/s at 5,500W and 11 J/TH in compact standalone chassis ($9,500). S21e XP Hyd 3U: 860 TH/s at 11,180W and 13 J/TH in 3U rack format ($11,649). Per dollar of hashrate: $19 per TH for S21 XP+ Hyd versus $13.54 per TH for S21e XP Hyd 3U (legacy 3U wins on acquisition cost per TH). Per watt efficiency: S21 XP+ Hyd 500TH wins at 11 versus 13 J/TH. For operators optimizing hashrate per dollar spent and willing to accept 18 percent worse efficiency, the 3U unit provides more hashrate per dollar. For operators optimizing long term electricity efficiency, the S21 XP+ Hyd 500TH wins. For operators needing compact chassis rather than 3U rack format, the S21 XP+ Hyd 500TH is the only choice.

External closed loop water cooling system with standard industrial components. Each unit generates approximately 5.5 kW thermal load (18,760 BTU per hour), requiring circulation pumps sized for fleet flow rate, dry cooler or water to water heat exchanger rated for aggregate thermal load, inline particulate filtration, automated flow monitoring, and temperature management at inlet and outlet. Same cooling infrastructure requirements as the S23 Hydro 580TH standalone. Multi unit deployments scale cooling proportionally through manifold distribution with individual unit isolation valves.

339 x 173 x 207 mm chassis at 13.8 kg. Compact standalone format identical to the S21 XP Hydro 473TH and S21 XP+ Hydro 395TH universal voltage siblings (different cooling and power inlet configurations across variants). Fits on standard shelves, in compact rack configurations, or in dedicated 19 inch server racks depending on facility design. Does not require specialized 3U rack mount hardware of the S21e XP Hyd 3U or S23 Hyd 3U flagships. For operators with limited rack infrastructure or preferring flexible mounting options, the compact chassis is a deployment advantage.

Mining Now April 2026 at $0.07 per kWh: $16.30 daily revenue, $9.24 electricity, $7.23 daily net profit. MillionMiner $0.08 per kWh onsite calculator: $16.30 daily revenue, $10.56 electricity, $5.74 daily net. OneMiners April to August 2025 data at $0.04 per kWh industrial hosting: $19 to $22 daily earnings, averaging $19.28. ROI estimates: 1,045 to 1,983 days at $0.07 per kWh per Mining Now, compressed to 7 to 14 months at $0.04 per kWh industrial hosting per OneMiners. At BTC prices above $160,000, daily profit projections exceed $12 per unit at commercial electricity rates.

Generally no. The 380 to 415V three phase power requirement excludes most residential electrical service in most regions. Some advanced home deployments with three phase service (rare residential configurations or converted commercial buildings) and dedicated mechanical spaces can support S21 XP+ Hyd 500TH operation. The 5.5 kW thermal load requires meaningful home cooling infrastructure. For standard residential mining on single phase voltage, the Antminer S21 XP 270TH air cooled or S21+ Hydro 395TH universal voltage options represent the practical residential ceiling. Note: some OneMiners batch documentation references P33 connector supporting 1 to 3 phases which may enable single phase deployment of specific S21 XP+ Hyd 500TH batches. Verify connector and phase compatibility with MillionMiner before committing to single phase deployment.

50 dB chassis noise, effectively silent due to the absence of cooling fans. External cooling infrastructure generates acoustic signature separately. Pumps typically run 45 to 55 dB. Dry coolers typically run 55 to 70 dB depending on airflow requirements. Professional hydro cooled mining facilities isolate miner deployment space from cooling plant locations to manage total acoustic signature. Total deployment noise depends substantially on cooling infrastructure design rather than miner chassis.

Industrial deployment with three phase power and hydro cooling infrastructure. Step one: install dedicated 380 to 415V three phase electrical service with appropriate breaker capacity (20 amp three phase minimum). Step two: install and commission external hydro cooling loop with pumps, plumbing, coolant fill, dry cooler infrastructure, and temperature monitoring. Step three: rack or shelf mount the S21 XP+ Hyd units and connect water inlet/outlet fittings to manifold system. Verify zero leaks before energizing. Step four: connect three phase power cables (verify connector type against MillionMiner documentation) and Ethernet management cable. Step five: power on, allow coolant flow to stabilize, find miner IP through router DHCP, open Bitmain web interface, configure pool URL and Bitcoin wallet, verify hashrate reaches 485+ TH/s within 10 to 15 minutes.

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.

20 to 50 degrees Celsius ambient operating range at 10 to 90 percent humidity. Inlet water temperature constraints typical of Bitmain hydro hardware apply (consult Bitmain's user manual for specific constraints on this unit). External dry cooler specifications tie maximum facility ambient temperature to outlet water temperature. Cooling loop design must account for these constraints across seasonal temperature variation.

Standard 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 depending on fluid chemistry and water quality. Quarterly pump and dry cooler inspection. Inline filter replacement when pressure differential exceeds specification. Hashboard failure rates on hydro units run meaningfully lower than air cooled equivalents. Budget 3 to 5 percent of acquisition cost annually for maintenance reserves.

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. MillionMiner routes warranty claims through direct Bitmain channels. Document coolant testing schedule and maintenance records to protect warranty coverage.

Any Stratum compatible Bitcoin pool. Foundry USA leads by network hashrate share. F2Pool has the longest operational track record and supports merged mining. AntPool is the native Bitmain ecosystem pool with deep firmware integration. ViaBTC offers accumulation mode payouts. Luxor supports hashrate derivatives products. For fleet deployments above 5 PH/s (equivalent to 10+ units), direct negotiated agreements with major pools typically secure reduced fees below standard 1 to 2 percent rates.

Yes. MillionMiner operates managed hosting facilities with 380 to 415V three phase industrial power and hydro cooling infrastructure capable of supporting S21 XP+ Hyd deployments. Hosted deployment eliminates facility infrastructure CapEx and leverages MillionMiner's negotiated industrial electricity rates typically $0.04 to $0.06 per kWh. At these hosted rates, OneMiners documents $19 to $22 daily earnings per unit in April to August 2025 data. Contact MillionMiner sales through the Get a Quote button for hosting pricing and deployment timelines.

CapEx beyond miner acquisition: three phase electrical service installation ($5,000 to $20,000 per facility), hydro cooling loop and dry cooler infrastructure ($5,000 to $20,000 per rack), basic rack or shelf hardware ($200 to $1,500). Annual OpEx per unit at 5.5 kW continuous: electricity at $3,854 at $0.08 per kWh, $3,373 at $0.07 per kWh, $1,927 at $0.04 per kWh industrial hosting rates. Water glycol coolant maintenance ($100 to $200 annually per unit). Spare parts reserves (3 to 5 percent of acquisition annually). 3 year TCO per unit at $0.07 per kWh self hosted: approximately $9,500 hardware plus $10,120 electricity plus $800 maintenance equals $20,420 total. 3 year gross revenue at $0.07 per kWh profitability: approximately $8,000 to $12,000.

Upon late 2024 to early 2025 launch, the S21 XP+ Hyd 500TH represented Bitmain's highest efficiency standalone hydro option outside the 3U petahash class. The January 2026 launch of the S23 Hydro 580TH at 9.5 J/TH captured the standalone efficiency flagship position. The S21 XP+ Hyd 500TH now sits in the premium mid tier: meaningfully better efficiency than legacy S21 generation hardware (S21e at 13 J/TH, S21+ Hydro at 15 J/TH), meaningful acquisition cost savings versus S23 generation hardware. For operators with balanced efficiency and acquisition cost priorities over 2 to 3 year deployment horizons, the S21 XP+ Hyd 500TH maintains strong economic fit despite no longer holding flagship status.

Within Bitmain S23 generation (newer, higher efficiency): S23 Hydro 580TH standalone for flagship compact hydro, S23 Hyd 3U 1.16 PH/s for petahash 3U, S23 Air 318TH for air cooled, S23 Immersion 442TH for tank deployment, S23E Hyd 2U 865TH for tier alternative. Within Bitmain S21 generation: S21 XP Hydro 473TH for universal voltage compact hydro, S21+ Hydro 395TH for lower efficiency universal voltage option, S21e XP Hyd 3U 860TH for 3U rack format value play, S21e XP Hyd 430TH for prior generation standalone. For operators diversifying across manufacturers: Whatsminer M73S+ 540TH provides MicroBT rack mount alternative, Whatsminer M79S 1.35 PH/s represents high power hydro. Cross algorithm fleet diversification: Antminer KS7 for Kaspa, Antminer L11 for Litecoin and Dogecoin, IceRiver AE3 for Aleo, Antminer Z15 for Zcash. For modular long lifespan infrastructure: Proto Rig 819 TH/s provides Block's 10+ year chassis alternative. MillionMiner's ASIC hosting service accepts S21 XP+ Hyd 500TH units at negotiated industrial electricity rates.