Antminer S21 XP HYDRO (473Th)

473 TH/s SHA-256 at 5,676W and 12 J/TH efficiency. ±3 percent hashrate and ±5 percent power tolerance per Bitmain documentation. The single-phase universal voltage hydro variant in Bitmain's S21 lineup, released October-November 2024.

The S23 Hydro at 580 TH and 5,510W (9.5 J/TH) delivers 23 percent more hashrate at 26 percent better efficiency, but requires three-phase 380-415V electrical service and costs more than 2x the S21 XP Hydro acquisition price ($14,299 vs $6,899). For single-phase deployment or minimum hydro acquisition cost, the S21 XP Hydro wins.

The S21 XP+ Hyd 500 TH delivers 6 percent more hashrate at 9 percent better efficiency, but requires three-phase 380-415V electrical service and costs $2,601 more ($9,500 vs $6,899). For single-phase deployment or lower acquisition cost, the S21 XP Hydro 473 TH wins. For operators with three-phase service willing to step up acquisition cost, the XP+ Hyd 500 TH wins.

100 to 240V single-phase AC input via included PSU. 220V+ practical minimum at 25.8 amps continuous draw. At 110V draws 51.6 amps which exceeds standard residential circuit capacity. Standard 30 amp 220V circuit handles one unit. Compatible with US 220V commercial, European 230V, Asian 220V deployments without three-phase requirement.

Yes across all realistic deployment scenarios. At $0.08 per kWh: +$7.18 daily, +$2,621 annually. At $0.05 per kWh industrial rate: approximately +$11.27 daily, +$4,114 annually. At $0.04 per kWh: approximately +$12.63 daily, +$4,610 annually. Break even at approximately $0.133 per kWh. ROI 18 to 32 months at industrial electricity rates.

Closed-loop hydro cooling with external CDU circulating water/deionized water/water-glycol antifreeze at 8.0 to 10.0 L/min flow, ≤3.5 bar pressure, pH 8.5 to 9.5. External heat rejection via dry cooler sized at 5.7+ kW per unit. MillionMiner Equipment category includes Lianli radiators and CDU systems compatible with this deployment.

40 dB rated, but the miner itself has zero internal fans and is essentially silent. The 40 dB noise comes from external cooling infrastructure (pumps, radiators, dry coolers) which can be located in separate utility spaces away from working areas for additional acoustic isolation. Some distributor sources list 50 dB which reflects a more conservative full-system noise rating.

410 x 170 x 209 mm at 13.8 kg net weight (some distributors list 12.8 kg). Compact form factor compatible with standard 19-inch rack mounting and existing S21 hydro rack configurations. Single-person installation possible.

5 to 45 degrees Celsius operating range. Inlet water temperature should be controlled between 30-40°C for optimal performance. Storage temperature -20 to +70°C. Humidity tolerance 5 to 95 percent. Operating temperature maximum decreases by 1°C per 300m elevation above 900m.

Bitcoin (BTC) primarily on the SHA-256 algorithm. Also Bitcoin Cash (BCH), Bitcoin SV (BSV), Fractal Bitcoin (FB), eCash (XEC), and any SHA-256 derivative chain. Cannot mine non-SHA-256 algorithms.

Yes. Box contents include the Antminer S21 XP Hydro unit, PSU sized for the 5,676W rated load, power cables, and quick start guide.

Verify single-phase 220V+ circuit availability with 30 amp capacity. Connect hydro cooling supply and return hoses via quick-disconnect fittings to facility CDU. Connect single-phase power and Ethernet. Configure pool URL and BTC wallet via Antminer web interface. Hashrate stabilizes at approximately 473 TH/s within 15 to 20 minutes.

Possible with three caveats. First: 220V+ 30 amp dedicated circuit required (most US residential is 120V/15-20A; some homes have 240V 30A circuits for dryers/EV chargers). Second: hydro cooling infrastructure required (CDU, pumps, dry cooler) which is uncommon in residential settings. Third: ventilation for the cooling system heat rejection. For typical residential deployment without existing hydro infrastructure, the air-cooled S21 XP at 270 TH or S23 air-cooled at 318 TH are more practical choices.

Yes. MillionMiner hosting accepts S21 XP Hydro units at managed hydro-cooled facilities. At $0.05 per kWh: approximately +$11.27 daily profit per unit, +$4,114 annually. At $0.04 per kWh: approximately +$12.63 daily profit per unit, +$4,610 annually. Contact MillionMiner for current hosting rates.

365-day Bitmain factory warranty per CryptoMinerBros and BT-Miners documentation. Covers manufacturing defects under normal operating conditions. Tampering with warranty seal, exceeding rated voltage, or improper coolant chemistry voids coverage.

Quarterly coolant chemistry inspection (pH, conductivity, biological growth markers). Semi-annual coolant replacement or filtration. Annual hash board inspection. Continuous hashrate monitoring through Antminer web interface or BraiinsOS+ dashboard. Coolant pH should remain in 8.5-9.5 range.

Yes. BraiinsOS+ supports the Antminer S21 series including the S21 XP Hydro variant. Operators typically achieve 2 to 5 percent additional efficiency improvements over stock firmware. Vnish firmware also available. Third-party firmware may affect warranty coverage.

S21 XP Hydro 473 TH ($6,899, single-phase) for lowest acquisition cost or single-phase electrical service. S23 Hydro 580 TH ($14,299, three-phase) for current generation efficiency at 9.5 J/TH if you have three-phase service and budget. The S21 XP Hydro captures the value position; the S23 Hydro captures the efficiency leadership position.

Buy if you want hydro-cooled mining returns at minimum acquisition cost, you have hydro cooling infrastructure but only single-phase electrical service, you are starting a hydro mining facility and want to test infrastructure with the cheapest hydro option, or you have access to industrial hosting electricity for maximum profitability. Consider the S21 XP+ Hyd 500 TH or S23 Hydro for better efficiency if you have three-phase service. Avoid if you do not have any hydro cooling infrastructure (use the air-cooled S21 XP or S23 air-cooled instead).

Within the S21 hydro family: S21 XP+ Hyd 500 TH for higher efficiency three-phase variant, S21e XP Hydro 860 TH for higher hashrate 3U variant. S23 family: S23 Hydro at 580 TH for current generation efficiency, S23 air-cooled at 318 TH for non-hydro deployment. Equipment: Lianli hydro radiators and CDU systems, Mining Containers, Racks & Cabinets. Algorithm diversification: KS7 for Kaspa, L11 for Litecoin/Dogecoin, E11 for Ethereum Classic. MillionMiner ASIC hosting accepts S21 XP Hydro units.