Bitmain Antminer S21 XP 270 TH/s SHA-256 Bitcoin Miner

The Antminer S21 XP delivers 270 TH/s of SHA-256 hashrate at 3,645W and 13.5 J/TH, rated by Bitmain at plus or minus 3 percent hashrate and 5 percent power. Built on the BM1370 5nm chip across three hashboards, roughly 396 chips per unit, it is the most efficient air-cooled tier of the S21 series, ahead of the base S21 (200 TH/s, 17.5 J/TH), S21+ (235 TH/s, 16.5 J/TH), and S21 Pro (234 TH/s, 15 J/TH).

Across the air-cooled S21 series: the base S21 runs 200 TH/s at 17.5 J/TH, the S21+ 235 TH/s at 16.5 J/TH, the S21 Pro 234 TH/s at 15 J/TH, and the Antminer S21 XP 270 TH/s at 13.5 J/TH. The XP leads on both counts, producing 35 percent more hashrate than the base S21 for about 3 percent more power (3,645W versus 3,550W), and roughly 10 percent better efficiency than the Pro. That efficiency edge is why it holds margin longest as difficulty climbs.

For operators below roughly $0.08 per kWh, yes. At 3,645W, the XP consumes about 87.5 kWh per day, which costs $7.00 at $0.08 per kWh or $4.37 at $0.05 per kWh in power. As of mid-2026, gross mining revenue runs in the region of $9 to $10 per day, so the margin is healthy below five to seven cents and thins quickly above it. Because Bitcoin price and difficulty move daily, run your exact rate through the live calculator before ordering.

Any SHA-256 proof-of-work coin. The Antminer S21 XP mines Bitcoin (BTC) as the primary target for its market depth, and also handles Bitcoin Cash (BCH), Bitcoin SV (BSV), and Fractal Bitcoin. Merged mining through compatible pools can add supplementary rewards at no extra hashrate cost, though most operators point all 270 TH/s straight at Bitcoin.

A dedicated 220 to 240V circuit is the practical requirement. The Antminer S21 XP accepts 100 to 240V input, but at its 3,645W load a dedicated 20 amp, 220 to 240V circuit is the clean deployment, drawing about 16.6 amps continuous at 220V. A standard shared household outlet cannot carry it, so confirm your electrical service and breaker capacity before purchase.

MillionMiner lists the Antminer S21 XP at 40 dB, while third-party industry sources rate the standard air-cooled unit at 75 to 76 dB, comparable to a vacuum cleaner at close range. Confirm the actual noise level of your batch with MillionMiner sales before planning home deployment. Either way, an air-cooled ASIC of this class belongs in a dedicated mining room, garage, outbuilding, or hosting facility rather than a living space.

The Antminer S21 XP price is listed on this page. On running costs, the 3,645W draw uses about 87.5 kWh per day, roughly $6.12 in power at $0.07 per kWh. As of mid-2026 network conditions, gross revenue sits near $9 to $10 per day, leaving a net in the region of $3 to $4 daily at that power rate, which points to a payback measured in months rather than years for buyers on low industrial electricity. Since Bitcoin price and difficulty shift constantly, treat this as a dated estimate and enter the current price and your rate into MillionMiner's live calculator for today's figure.

Setup takes under 15 minutes. Plug the included PSU into the miner and a dedicated 220 to 240V, 20 amp circuit, connect the Ethernet cable, and power on. Find the miner's IP through your router or Bitmain's IP Reporter, open the web interface, change the default login, and enter your SHA-256 pool URL and BTC wallet. Hashrate stabilizes near 270 TH/s within minutes.

Any Stratum-compatible Bitcoin pool accepts the Antminer S21 XP with no special configuration. Foundry USA is the largest by hashrate, AntPool and F2Pool are widely used, and Braiins Pool, ViaBTC, Luxor, and OCEAN are all supported. Pool fees typically run 0 to 3 percent. NiceHash is an option for operators who prefer selling hashrate over direct mining.

It is possible with realistic expectations. You need a dedicated 220 to 240V, 20 amp circuit, which most homes require panel work to add, a room or garage that can handle the heat from 3,645W of continuous draw (roughly 2.5 space heaters running nonstop), and tolerance for the noise, listed by MillionMiner at 40 dB while third-party sources rate it at 75 to 76 dB. For most homes, an insulated garage, outbuilding, or MillionMiner hosting is more practical than living space.

The Antminer S21 XP ships with Bitmain's stock firmware for pool configuration, hashrate monitoring, temperature tracking, and fan control through the web interface. Third-party firmware including BraiinsOS+ and Vnish supports the BM1370 platform, adding autotuning that finds optimal voltage and frequency and can lift efficiency a few percent below the stock 13.5 J/TH. Note that third-party firmware may affect warranty coverage.

Three issues surface most often. First, hashboard failures from the high chip density (approximately 396 BM1370 chips per unit). Individual chip failures reduce output, and the fix usually involves identifying which hashboard shows reduced chip count through the web interface and either RMAing the board or replacing it. Second, fan errors because all four fans run at high RPM to cool the dense chip layout. Fan failures trigger protective shutdown, and replacements are standard Bitmain SKUs. Third, temperature warnings when ambient exceeds approximately 38 degrees Celsius (well below the 45 degree rated maximum in practice). Solutions include improving intake air quality, adjusting fan curves through the web interface, or reducing ambient temperature through facility cooling. Power delivery issues from substandard PSUs or undersized circuits cause spontaneous reboots.

The Antminer S23 family, at 11.0 down to 9.5 J/TH, is Bitmain's current generation beyond the XP, but most S23 units are hydro-cooled and need a water-cooling loop and industrial three-phase power. If you have that infrastructure and are scaling a large farm, the S23 pushes efficiency 20 to 30 percent further. If you want the best efficiency in a deploy-anywhere air-cooled unit on standard single-phase power, the Antminer S21 XP at 13.5 J/TH remains the right choice.

The Whatsminer M60S at 186 TH/s and 18.5 J/TH sits a full generation behind the S21 XP on both hashrate and efficiency. MicroBT's newer M70 generation includes the M72S at 264 TH/s and approximately 14.5 J/TH, which is the closest direct competitor to the S21 XP. The XP produces slightly more hashrate (270 versus 264 TH/s) at better efficiency (13.5 versus 14.5 J/TH). For operators choosing between brands, the decision usually comes down to distributor pricing, warranty terms, and existing fleet management compatibility. If you run Bitmain fleets, stick with the XP for unified management. If you run MicroBT fleets, the M72S integrates seamlessly.

Yes, within limits. Bitmain's stock firmware allows fan-curve and frequency adjustments through the web interface. Third-party firmware such as BraiinsOS+ unlocks finer control, letting operators underclock the Antminer S21 XP for better efficiency at lower power, or push frequency past 270 TH/s at higher heat and energy use. Aggressive overclocking raises failure risk and can affect warranty.

MillionMiner ships the S21 XP with Bitmain's standard factory warranty, typically 180 to 365 days from shipping date depending on batch and distributor terms. Warranty covers manufacturing defects and hardware failures under normal operation. It does not cover damage from improper electrical installation, overclocking beyond factory specifications, physical mishandling, or deployment outside the rated 5 to 45 degree operating range. MillionMiner routes warranty claims through their support team with direct Bitmain channel access, which speeds resolution compared to secondary market purchases. Confirm exact warranty terms with MillionMiner sales for your specific batch at purchase time.

For existing Bitmain fleets, integration is effectively zero configuration. The Antminer S21 XP uses the same Antminer firmware, web interface, and pool setup as other S19, S21, and S23 units, and works with standard Bitmain fleet-management and monitoring tools. Add it to your Stratum pool, assign it in your dashboard, and it reports alongside the rest of the fleet without workflow changes.

Monthly fan cleaning with compressed air to clear dust buildup that reduces cooling efficiency and accelerates fan bearing wear. Quarterly inspection of hashboard seating and connector integrity. Annual or semi annual firmware updates when Bitmain releases patches for security, stability, or efficiency improvements. Environmental monitoring: track ambient temperature and humidity continuously, because most S21 XP failures trace back to thermal stress from poor ventilation. Every 18 to 24 months, expect at least one hashboard or fan replacement on a unit running at full duty cycle. Budget approximately 3 to 5 percent of acquisition cost annually for replacement parts and maintenance labor.

For most buyers, yes. MillionMiner and comparable professional hosting facilities offer industrial electricity rates between $0.06 and $0.08 per kWh all-in, which often beats residential rates in Europe, North America, and developed Asia. Hosting eliminates the noise, heat, circuit installation, maintenance, and security headaches of home deployment. The tradeoff is hosting fees (typically $0.01 to $0.02 per kWh on top of electricity) and reduced operational control. The math: at $0.15 per kWh home versus $0.08 per kWh hosted plus fees, hosting saves approximately $6 per day per unit, which covers most hosting agreement fees with margin to spare. Home deployment makes economic sense primarily for operators with sub $0.08 per kWh residential rates, typically achievable only with solar, off grid, or time of use arbitrage setups.

Within the S21 series, compare the Antminer S21+ (235 TH/s at a lower entry cost for capital-constrained fleets) and the S21 Pro (234 TH/s at 15 J/TH) for buyers who do not need the XP's top efficiency. For hydro deployments, the S21 XP Hydro (473 TH/s) and the S23 hydro family push efficiency to 9.5 J/TH. For algorithm diversification, MillionMiner also stocks the Antminer KS7 for Kaspa and L11 for Litecoin and Dogecoin.