The Antminer S21 represents a significant leap forward in Bitcoin mining technology. Developed by Bitmain in collaboration with TSMC, a world-leading semiconductor foundry, this model utilizes advanced 7nm chip technology. This innovation delivers a remarkable 40% improvement in power efficiency compared to its predecessor, the S19 series. This guide provides an in-depth look at its specifications, performance, and key considerations for potential buyers.
Key Specifications and Technical Details
The Antminer S21 is engineered for maximum performance within the SHA-256 algorithm ecosystem, supporting cryptocurrencies like Bitcoin (BTC), Bitcoin Cash (BCH), and Bitcoin SV (BSV).
Here’s a breakdown of its core technical specifications:
- Hash Rate: 200 TH/s ± 3%
- Power Consumption: 3010W ± 5% (at wall, 25°C)
- Power Efficiency: 17.5 J/TH ± 5%
- Network Connection: RJ45 Ethernet 10/100M
- Operating Temperature: 0°C to 40°C
- Dimensions (without package): 400mm (L) x 195.5mm (W) x 290mm (H)
- Net Weight: 14.2 kg
- Warranty: 180 days from the shipping date
This combination of high hash rate and superior efficiency positions the S21 as a top-tier choice for miners aiming to optimize profitability while managing operational costs.
Advantages of the Antminer S21
The S21 offers several compelling benefits for both individual and large-scale mining operations.
Enhanced Profitability: The most significant advantage is its improved power efficiency. Lower energy consumption per terahash directly translates to higher profit margins, especially in regions with expensive electricity.
Robust Build Quality: As part of Bitmain's flagship S-line, the S21 is built to last. Its durable design ensures stable, long-term operation, which is critical for achieving a return on investment.
Environmental Consideration: By achieving more computational work with less energy, the S21 addresses growing concerns about the environmental impact of cryptocurrency mining, offering a more sustainable option.
For those looking to build or upgrade their mining operation, understanding the real-time profitability of this hardware is crucial. You can explore more strategies for calculating potential returns based on current network difficulty and electricity rates.
Important Considerations Before You Buy
Purchasing an ASIC miner is a significant investment. Beyond the specs, several practical factors must be weighed.
Power Requirements: With a power draw of over 3000W, the S21 requires a dedicated 200-240V circuit and a stable, powerful electrical infrastructure. This is not a device that can be plugged into a standard household outlet without preparation.
Heat and Noise Management: Bitcoin miners generate substantial heat and noise. Adequate ventilation, cooling systems, and a suitable location (e.g., a dedicated garage, basement, or warehouse) are absolute necessities to prevent overheating and ensure optimal performance.
Initial Investment and ROI: Prospective miners must calculate the potential Return on Investment (ROI). This calculation should include the cost of the unit, electricity rates, the current Bitcoin price, and network mining difficulty. 👉 View real-time tools to help model these variables accurately.
Setting Up Your Antminer S21
Getting your miner operational is a straightforward process.
- Unbox and Inspect: Carefully unbox the unit and check for any physical damage that may have occurred during shipping.
- Connect to Power: Using the included power supply unit (PSU), connect the miner to your dedicated 240V outlet.
- Network Connection: Plug an Ethernet cable from your router into the miner's Ethernet port.
- Find the IP Address: Use your router's admin interface or a IP scanning tool to find the local IP address assigned to the miner.
- Access the Interface: Enter the miner's IP address into a web browser to access its configuration interface.
- Configure a Mining Pool: You will need to join a mining pool. In the miner's settings, input the URL, port, and your worker credentials from your chosen mining pool.
- Save and Start: Save the settings, and the miner will begin hashing and submitting shares to your pool.
Frequently Asked Questions
What is the daily profit of an Antminer S21?
Profitability is dynamic and depends on Bitcoin's market price, the network's total hash rate, and your electricity cost. Use an online mining calculator, inputting the S21's hash rate (200 TH/s) and power consumption (3010W), to get a daily estimate.
What is the difference between the S21 and S21 Hydro?
The primary difference is the cooling system. The standard S21 uses air cooling with fans, while the S21 Hydro uses immersion cooling, which can lead to even higher efficiency and lower noise but requires a more complex liquid cooling setup.
Is the Antminer S21 worth it in 2025?
Its value hinges on market conditions and energy costs. Its high efficiency makes it more resilient against falling profitability than less efficient models. It is a solid investment for those with access to low-cost electricity and a robust setup.
How loud is the Antminer S21?
Like all high-performance air-cooled ASIC miners, the S21 is very loud, often operating at over 75 decibels. It is not suitable for living spaces and should be placed in an isolated, well-ventilated area.
Does it come with a power supply?
Yes, the Antminer S21 is typically sold as a complete unit that includes an compatible APW12 power supply unit.
What is the warranty period?
The manufacturer provides a standard 180-day warranty from the date of shipment, covering defects in materials and workmanship.