Bitmain Antminer S21 200TH SHA-256 Bitcoin Miner

The Antminer S21 delivers 200 TH/s of SHA-256 hashrate at 3,550W and 17.5 J/TH on Bitmain's BM1368 5nm chip, within plus or minus 3 percent hashrate and 5 percent power tolerance. Released February 2024, it is the base tier of the S21 series, below the S21 Pro (234 TH/s), S21+ (235 TH/s), and S21 XP (270 TH/s).

The S21 Pro delivers 234 TH/s at 3,510W and 15 J/TH, while the base S21 delivers 200 TH/s at 3,550W and 17.5 J/TH. The Pro produces about 17 percent more hashrate at 17 percent better efficiency for a higher upfront cost. Both use the same BM1368 chip, so the difference is silicon binning. Choose the base model for lowest entry cost, the Pro for efficiency over long deployments.

The S21 XP delivers 270 TH/s at 3,645W and 13.5 J/TH, while the base S21 delivers 200 TH/s at 3,550W and 17.5 J/TH. The XP is the premium air-cooled tier, about 35 percent more hashrate at meaningfully better efficiency for a higher upfront cost. The base model trades that efficiency for the lowest entry cost, a straight CapEx-against-efficiency decision.

The Antminer S21 needs 200 to 240V AC single-phase power at up to 20A via its P13-C20 cord, drawing about 16 amps continuous at 220V. Antminer S21 power consumption is 3,550W, so it requires a dedicated commercial-grade circuit like those for dryers or ovens. It does not run on 110V residential power, and wrong input voltage can damage the miner, so verify your service before purchase.

A used unit carries the lowest Antminer S21 200TH price but may show cosmetic wear or reduced remaining warranty, and should be inspected and hashrate-verified before deployment. Plug-and-Play Ready is tested and verified for immediate use with the full 365-day Bitmain factory warranty. Choose used for the lowest entry cost if you can inspect hardware; choose Plug-and-Play Ready for a turnkey, fully-covered unit.

Antminer S21 profitability depends on the Bitcoin price, network difficulty, and your electricity rate, not on any fixed figure. With a 3,550W draw, power cost is the biggest lever on net return, so the miner rewards low industrial or hosted power and narrows quickly at high residential rates. Run your own rate through MillionMiner's live calculator for a current estimate.

Yes, BraiinsOS+ supports the full S21 series including the base model. Its autotuning optimizes chip voltage and frequency, typically improving efficiency a few percent over stock Bitmain firmware and pushing the unit below its rated 17.5 J/TH. Vnish is another option. Third-party firmware may affect warranty coverage.

The Antminer S21 noise level is around 75 dB from four fans at full load, industrial-grade and comparable to a vacuum cleaner. It is not suited to living spaces, bedrooms, or shared offices, and belongs in a dedicated mining room, insulated garage, outbuilding, or hosting facility. Fan noise rises as ambient temperature climbs.

The S21 measures 400 x 195.5 x 290 mm and weighs 13.5 kg net. It uses the standard Antminer chassis, compatible with existing S19 and S21 shelving and 4U rack layouts, and is light enough for single-person handling. Packaged shipping weight is about 17 kg with the PSU.

5 to 45 degrees Celsius ambient operating range at 5 to 95 percent humidity tolerance per Bitmain official documentation. Operating temperature maximum decreases by 1°C per 300 meter elevation increase above 900 meters per Bitmain's altitude guidance. For deployment in hot climates such as the UAE, Texas summer, Arizona, or tropical regions, ambient cooling infrastructure must hold intake air below approximately 40°C at peak load to maintain consistent hashrate. Fan RPM increases substantially as ambient temperature approaches the 45°C upper limit, raising noise and reducing component lifespan.

All SHA-256 proof of work cryptocurrencies. Bitcoin (BTC) is the primary target. Bitcoin Cash (BCH), Bitcoin SV (BSV), eCash (XEC), Fractal Bitcoin (FB), and other SHA-256 chains are also mineable. AuxPoW merged mining is available through compatible pools such as RSK (Rootstock) alongside Bitcoin, providing supplementary rewards at zero additional hashrate cost. Most operators mine Bitcoin directly at major pools for maximum revenue stability. Alternative SHA-256 chains occasionally deliver higher per-hashrate revenue during specific market conditions, making pool-switching strategies viable for operators with flexible configurations.

Yes, the S21 ships with an included PSU sized for its 3,550W load, plus the P13-C20 power cord. Box contents from MillionMiner are the miner, PSU, power cables, and quick-start guide. Contents can vary by batch and configuration, so verify at purchase for multi-unit orders.

Standard Antminer setup. Step one: verify 220 to 240V electrical circuit with 20A capacity at the deployment location. Step two: connect the included P13-C20 power cord to the integrated PSU and plug into the 220V+ outlet. Step three: connect Ethernet cable to the router or network switch. Step four: find miner IP through Bitmain IP Reporter software, router DHCP assignment table, or network scanning tool. Step five: open the Antminer web interface in a browser, login with default root/root credentials (change immediately for security), configure SHA-256 pool URL and BTC wallet address. Step six: verify hashrate stabilizes at approximately 200 TH/s within 10 to 15 minutes of startup.

Every major SHA-256 mining pool supports the S21: Foundry USA, AntPool, F2Pool, ViaBTC, Braiins Pool, Luxor, OCEAN, SpiderPool, EMCD, and all other SHA-256 compatible pools. Standard Stratum protocol with no hardware restrictions on pool selection. Pool fees typically range from 0 to 3 percent of revenue depending on pool business model. NiceHash supports the S21 for hashrate rental marketplace sellers who prefer rental income over direct mining rewards. Verify pool specifics before deployment including minimum payout thresholds, hashrate reporting accuracy, and any minimum hashrate requirements.

Plug-and-Play Ready Antminer S21 units carry the 365-day Bitmain factory warranty, among the longest in ASIC mining, where 180 days is common. It covers manufacturing defects and hardware failures under normal operation. Tampering, incompatible PSUs, over-voltage, or physical damage void coverage. Used-configuration warranty varies, so verify at purchase.

Standard air cooled Antminer maintenance. Quarterly dust cleaning of the four fan intakes and rear exhaust prevents thermal throttling and premature fan bearing wear. Annual fan bearing inspection with replacement if bearing noise develops. Monitor hashrate continuously through the Antminer web interface or BraiinsOS+ dashboard. Bitmain's S21 platform has two years of field reliability data as of April 2026 with no known systemic reliability issues. For Used unit operators, add initial inspection of chassis for signs of thermal stress, verify PSU capacitor health if possible, run 24-hour burn-in at rated load before production deployment, and test all four fans under load to confirm functional cooling.

Yes. MillionMiner hosting services accept Antminer S21 series hardware at managed facilities with 220V+ electrical infrastructure. At $0.07 per kWh hosted electricity: +$1.23 daily profit at current Bitcoin pricing. At $0.05 per kWh industrial hosting rates: approximately +$2.78 daily profit. Hosting eliminates facility CapEx, noise management, thermal infrastructure, and day-to-day operational overhead. For first time Bitcoin mining buyers without 220V circuits, dedicated deployment space, or 75 dB-tolerant mining location, hosting through MillionMiner is often the practical path to operational Bitcoin mining. Contact MillionMiner for current hosting rates, power tier options, and facility availability.

Yes, for buyers with a 200 to 240V circuit and dedicated space. The base model is the lowest-CapEx current-generation Bitcoin miner at MillionMiner, backed by Bitmain's mature firmware and proven reliability. Without a suitable circuit or noise-tolerant space, MillionMiner hosting is often more practical than home deployment.

Buy Antminer S21 if you want the lowest-cost entry into current-generation Bitcoin mining, you have a 200 to 240V circuit and dedicated space, and per-unit cost matters more than peak efficiency. Step up to the S21 Pro for better efficiency, or the S21 XP for maximum hashrate, if your deployment is long and power is expensive.

Within the S21 series, the S21 Pro (234 TH/s, 15 J/TH) and S21 XP (270 TH/s, 13.5 J/TH) are efficiency upgrades, and the S21+ Hyd (319 TH/s) and S21 XP Hydro (473 TH/s) are hydro-cooled options. The S23 (318 TH/s, 11 J/TH) is the next generation. For other algorithms, MillionMiner also stocks the KS7 for Kaspa and L9 for Scrypt.