Bitmain Antminer S21 Immersion 215 TH/s – Bitcoin ASIC miner

Key information about Bitmain Antminer S21 Immersion 215 TH/s

Bitmain Antminer S21 Immersion 215 TH/s is a high-performance oil‑cooled ASIC miner designed for efficient Bitcoin mining on the SHA‑256 algorithm. This model delivers a hashrate of 215 TH/s with power consumption of about 3440 W, resulting in an energy efficiency of roughly 16 J/TH in real‑world conditions. Such parameters make the S21 Immersion 215 TH/s a strong choice for farms that are building or already operating immersion cooling systems and want a reliable balance between hashrate, efficiency and hardware cost.

The miner is engineered specifically for full immersion in dielectric oil, which provides excellent thermal stability and protects components from dust, moisture and rapid temperature changes. When installed in a properly designed immersion tank with circulation and heat removal, chip temperatures remain stable even at sustained 24/7 load. The design eliminates onboard high‑speed fans, which drastically reduces noise at miner level and transfers most of the sound to pumps and external cooling equipment. Bitmain Antminer S21 Immersion 215 TH/s is ideal for high‑density mining containers and industrial sites where air cooling is difficult or noise must be minimized.

Specifications

• Model: Bitmain Antminer S21 Immersion 215 TH/s
• Hashrate: 215 TH/s (SHA‑256)
• Algorithm: SHA‑256 (Bitcoin, Bitcoin Cash, BSV and other SHA‑256‑based coins)
• Power Consumption: approximately 3440 W at the wall
• Energy Efficiency: approximately 16 J/TH in typical immersion conditions
• Cooling Type: immersion oil cooling (designed to operate fully submerged in dielectric fluid)
• Input Voltage: 3‑phase industrial AC, typically 380–415 V, 50–60 Hz
• Noise Level: around 50 dB at miner level in immersion setups (no high‑speed fans)
• Release Date: around December 2024 for the first S21 Immersion batches
• Dimensions: approximately 293 × 236 × 364 mm (immersion chassis)
• Weight: about 17.15 kg net
• Network Connection: Ethernet 10/100M (RJ‑45)
• Operating Temperature: recommended oil temperature about 30–55 °C, humidity 10–90% (non‑condensing)
• Typical Use Case: professional BTC mining farms, immersion containers, noise‑sensitive locations and industrial projects with heat‑recovery potential

Profitability and ROI of Bitmain Antminer S21 Immersion 215 TH/s

The profitability of the Bitmain Antminer S21 Immersion 215 TH/s depends on its 215 TH/s hashrate and about 16 J/TH efficiency, as well as on external factors such as Bitcoin price, network difficulty, pool fees and your electricity rate. To estimate potential income, you can use ASIC mining profitability calculators, entering 215 TH/s and a power draw close to 3440 W for your real operating conditions, including energy cost and pool commission. This will show expected daily and monthly revenue and help you compare the S21 Immersion 215 TH/s with other miners in terms of net profit, cost per terahash and payback period.

The basic ROI formula is straightforward: payback period equals miner price divided by the difference between monthly mining income and monthly electricity bill. Thanks to its immersion‑optimized design and reasonable efficiency, the S21 Immersion 215 TH/s can offer attractive economics in projects where immersion infrastructure already exists or is planned, particularly with industrial electricity tariffs. However, profitability remains sensitive to BTC price and difficulty trends, so miners should regularly update their calculations and model several scenarios over a 12–36 month horizon with different market assumptions.

Advantages of Bitmain Antminer S21 Immersion 215 TH/s

Immersion‑optimized efficiency – with approximately 16 J/TH, the Bitmain Antminer S21 Immersion 215 TH/s provides a solid efficiency level for an immersion‑class miner, improving power usage compared to older air‑cooled generations. Oil cooling design – operating fully submerged in dielectric fluid significantly improves thermal management, reduces thermal stress, prevents dust buildup and eliminates fan failures, which can extend hardware lifetime. Reduced noise – without high‑speed fans, the miner runs much quieter at the device level, making it suitable for high‑density deployments where air‑cooled ASIC noise would be too loud.

Another important advantage is higher reliability and potentially lower maintenance requirements in immersion systems. Even temperature distribution across components reduces hot spots and thermal cycling, helping to keep hashrate stable over time. Immersion setups also allow very dense rack layouts because air distribution, hot and cold aisles and fan backpressure are no longer limiting factors. For operators who already run immersion tanks for S19 or S21 XP devices, adding S21 Immersion 215 TH/s units lets them increase total hashrate inside the same facility while keeping the same cooling concept.

Potential drawbacks and what to consider

Immersion infrastructure required – Bitmain Antminer S21 Immersion 215 TH/s is not a plug‑and‑play air‑cooled miner. It must be installed in suitable immersion tanks with pumps, plumbing, heat exchangers and monitoring of oil quality, and it requires routine maintenance of the cooling loop. Building such infrastructure demands higher upfront investment compared to conventional air‑cooled racks, and poor system design (insufficient flow, inadequate cooling, contamination) can lead to reduced performance or hardware failures.

Higher entry threshold – as an immersion‑ready ASIC, the S21 Immersion 215 TH/s typically has a higher capital cost per unit than many used or older air‑cooled miners. Its long‑term competitiveness depends on the electricity rate, quality of immersion implementation and BTC market conditions. Operators should carefully compare expected net profit against newer, more efficient immersion or hydro models and consider the full cost of ownership, including tanks, pumps, heat exchangers and maintenance, before committing to large‑scale deployment.

Who is Bitmain Antminer S21 Immersion 215 TH/s suitable for?

Bitmain Antminer S21 Immersion 215 TH/s is best suited for professional mining farms, hosting providers and industrial projects that already run or plan to deploy immersion cooling. It is an excellent choice for high‑density mining containers, industrial facilities and data centers where air cooling is difficult, noise is critical or ambient conditions are challenging for standard air‑cooled units. In these environments, the S21 Immersion 215 TH/s can deliver significant hashrate per tank while benefiting from stable temperatures and reduced mechanical wear.

The model is also interesting for experienced miners upgrading from older S19 or early S21 air‑cooled devices to immersion solutions to improve efficiency, reduce noise and extend equipment lifetime. For hosting providers that specialize in immersion, offering S21 Immersion 215 TH/s miners can help attract clients who want immersion‑ready hardware with a solid efficiency profile. In all cases, successful deployment requires careful planning of electrical and cooling systems, realistic profitability modelling and disciplined operation of the immersion environment.

How to buy Bitmain Antminer S21 Immersion 215 TH/s from us

Buying Bitmain Antminer S21 Immersion 215 TH/s in our shop is straightforward. First, check the current price and availability on this product page and review the key specifications, including hashrate, power consumption, cooling type and infrastructure requirements. If you need assistance in selecting the optimal number of units, sizing immersion tanks or estimating profitability for your electricity rate and planned deployment, contact our support team and we will prepare an individual calculation tailored to your project.

After you confirm the configuration, add the Antminer S21 Immersion 215 TH/s to your cart and proceed to checkout. We support secure payment options, including bank transfer and cryptocurrency, and for bulk orders we can reserve miners after receiving a deposit according to current terms. Once payment is confirmed, we carefully pack the devices and arrange tracked delivery so you can follow the shipment. Our team can also provide basic guidance on integrating the miners into your immersion setup, connecting them to mining pools and monitoring performance, so you can start mining as quickly and smoothly as possible.

Bitmain Antminer S21 Immersion 215 TH/s Video Review

To increase user engagement on the product page, you can embed a video review of the Bitmain Antminer S21 Immersion 215 TH/s showing real hashrate, power draw, oil temperatures and stability under load in a working immersion system. A practical video overview helps potential buyers understand how the miner is installed in tanks, how quiet the setup is and what to expect during filling, startup, daily operation and maintenance.